TSDZ2 vs BBS02

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What happens when two of the best-selling mid-drive electric bike conversion kits go head to head?  In this TSDZ2 vs BBS02 comparison I’ll take a closer look at what both kits have to offer, their differences and the pros and cons. Over the last couple of years I have installed more than a hundred Bafang mid drives, and more recently around twenty Tongsheng systems. At the end of the article, I will reveal my personal favourite.


Both the Tongsheng TSDZ2 and the Bafang BBS02 are market leaders in mid-drive electric bike conversion kits, with the latter having a substantially larger slice of the pie.

Bafang BBS02B

The Bafang motor is well-established, and despite some ongoing reliability issues, still offers the most bang for your buck. A BBS02 750w will kick out close to 1500w with a 52v battery fitted. This will transform your humble bicycle into a high performance speed machine (but the 52v battery may compromise reliability). I always recommend sticking with a 48v battery, unless you are willing to shell out for replacement controllers.

Bafang BBS02B 750w – ✅Trusted Vendor

The pedal assist system (PAS) on the Bafang motor acts like an on/off switch. As soon as the pedals rotate a few degrees, the motor kicks in. The pedal assist on all the Bafang BBS motors can be fine-tuned with controller programming and careful selection of the 9 available power levels.

With this method of pedal assist you just have to turn the pedals to get assistance, you don’t have to put a lot of effort in. It is possible to climb a 25% gradient in a low gear with the power level set to 9. All you will be doing is spinning the pedals, the motor will be doing most of the work!

The BBS02 has a lot of potential for fine-tuning. Being able to reprogram this motor is a real bonus.

It should be noted, that compared to a normal bike the Bafang is harder to pedal when the motor is switched off.  This is not so much of an issue when cycling on the flat, but if you find yourself out of battery power, pedalling up a steep hill can be practically impossible.

carrera vulcan fitted with a bafang mid drive electric conversion
Bafang BBS02B mountain bike conversion

The BBS02 has a lot of potential for fine-tuning. Being able to reprogram this motor is a real bonus, and in some cases necessary. In my experience, the factory pedal assist settings are not very good, in particular the way the pedal assist stops and starts. Thankfully these can be changed in a matter of minutes by connecting your motor to your laptop using a Bafang USB lead and this free open source software.

Read the full Bafang BBS02B review

Tongsheng TSDZ2

The TSDZ2 has been around for a while now, and early reliability issues seem to have been resolved. It is now a very viable alternative to the Bafang BBS02.

tongsheng tsdz2 review

The main difference between these two motors is the pedal assist. With the Tongsheng it is not a free ride. You are rewarded with more power only if you put the effort in.

The progressive surge of power you get in sport mode really does make you feel like the bionic man!

The Tongsheng uses torque sensing pedal assist. This gives you motor-assistance proportionate to how much force you are applying to the pedals. This makes for a very intuitive system right out-of-the-box.

Even using the 48v750w version**, you still have to put some degree of effort into pedalling in order for the motor to work. I really like this, as it feels a like a Bosch motor on steroids!

The progressive surge of power you get in sport mode really does make you feel like the bionic man! The motor feels more like an extension to your own cycling abilities.

a diy electric bike for comparison with a factory produced ebike
The Tongsheng TSDZ2 makes for a very neat installation

If you prefer to ride at a high pedalling cadence, it is worth noting that these motors do not produce any noticeable assistance above 90rpm. The initial burst of power fades quickly when these high cadences are reached, even though force is still being applied to the pedals.

With the motor switched off, the Tongsheng wins, hands down over the Bafang. Although there is some increased pedalling resistance, it is nowhere near as noticeable as on the BBS02.

If the BBS02 is the lazy man’s electric bike conversion kit, then the TSDZ2 is for people that don’t mind working up a bit of a sweat. Although the 500w and 750w versions are substantially quicker than their lower powered counterparts, you still have to put in some effort to get the motor working.

The only downside with the Tongsheng motor, is programming the controller. It is possible but it is not as straightforward as with the Bafang, also you are limited to only 4 different levels of assist versus the Bafang’s 9 levels.

**Tongsheng do not officially sell a 750w version of the TSDZ2 – such versions have modified firmware and may be susceptible to reliability issues.

Read the full Tongsheng TSDZ2 review

Bafang BBS02B Pros and Cons

The Bafang BBS02B is a great motor. But, like all things electric, there are potential problems to be aware of. On the whole, I would say the BBS02B is one of the best e-bike conversion kits available, but its suitability really depends on your personal needs. If it’s raw power you’re after and hill busting torque, then the BBS02B is a tough act to follow!


  • Very responsive pedal assist
  • 9 levels of pedal assist
  • Good spare parts availability – click here for list of parts
  • Programmable
  • Well established brand
  • Very powerful


  • Some reliability issues still persist
  • Pedalling resistance, when motor is switched off
  • The motor may need periodic tightening
  • More expensive than the Tongsheng
  • Feels more like an electric motorcycle (not a bad thing, if that is what you are looking for)
  • Stock controller settings are not very intuitive

Tongsheng TSDZ2 Pros and Cons

If you’re looking for e-assist that rewards you for the effort you put in, then the Tongsheng TSDZ2 is ideal. This motor enhances your riding ability whereas the Bafang can completely take over! The TSDZ2 is the closest thing you will get to a Bosch or Shimano Steps. And, although it’s nowhere near as refined, it’s pretty damn good for the price!


  • Intuitive torque sensing system
  • Easier to pedal than the Bafang when the motor is switched off
  • Lighter than the Bafang
  • Can provide a ‘more natural’ cycling experience
  • Very efficient motor / increased battery range
  • Parts availability is good – click here for a parts list
  • Great value


  • A certain degree of pedalling effort is required to start the motor – this may not be suitable for everyone
  • Programming is possible, but not as straightforward as the Bafang
  • Only 4 levels of assistance
  • Very limited clearance between motor axle and bottom bracket
  • The motor does not give any noticeable assistance at high pedalling cadences.
  • The blue nylon primary gear can be prone to premature failure
  • Although the torque sensor is generally reliable, it has been known to fail.
  • Wider q-factor

Conclusion – TSDZ2 vs BBS02 is there a clear winner?

Both of the Bafang and Tongsheng motors are excellent in their own way, but which motor to choose really boils down to your own personal preferences.

If you want an enhanced cycling experience, with the motor feeling like an extension to your own ability, then the Tongsheng is definitely the way to go. If you have a medical condition that limits your ability to pedal hard, or you just want an e-bike that does most of the work, then the Bafang may be more suitable.

My personal favourite

Both of these motors are great fun and will transform your riding experience! If I had to make a choice, based on my own personal experiences, then I would have to choose the Tongsheng over the Bafang. I’ve had the benefit of covering lots of miles on both motors and I just prefer the feel of the torque sensing pedal assist. Plus, I like the neat installation and increased efficiency of the motor. I still love the Bafang though, as it just destroys hills without effort!


If you are concerned about the current e-bike laws, it is worth remembering that both the BBS02 and 500w / 750w TSDZ2 are not road legal in the UK, EU or Australia. If you do choose to use them on the road you do so at your own risk and most importantly you need to consider the potential risk to others. Please read my guide to electric bike law .

If you choose to go down this path, make sure at the very least you limit the top assisted speed to 25km/h (15mph) and ride sensibly. The consequences could be dire if you were to have an accident riding one of these on the road – RIDE SAFE!

Where can I buy the Tongsheng or Bafang motor kits?

Both the Bafang and Tongsheng are global best-sellers in the field of e-bike conversion kits, and as such are widely available. Tongsheng availability has been limited on Aliexpress recently, due to a patent lawsuit (from Bafang). Both motor kits are still available on eBay and Amazon in most territories. I have provided links below to sellers with good feedback on all main e-commerce platforms.

Bafang BBS02B 

eBay UK
eBay USA
eBay AU
eBay CA
eBay France
eBay Italy
eBay Spain
Amazon (various locales)
Banggood (EU Shipping)

Tongsheng TSDZ2

eBay UK
eBay USA
eBay CA
eBay AU
eBay DE
eBay IT
eBay FR
eBay ES
Amazon (various locales)
Banggood (EU Shipping)

Thanks for reading, please feel free to leave a comment below – I usually respond within 24hrs


Passionate E-Bike advocate and enthusiast since 2016. Riding an electric bike helped me to lose weight, get fit and reignite my passion for cycling!

54 thoughts on “TSDZ2 vs BBS02

  • Hi, I want to install a mid-drive conversion kit on my wife’s Electra Townie i3 bike. She loves it because she is only 5 ft tall and the seat can be lowered enough to be comfortable for her. This bike has a COASTER BRAKE. I have been weary of the Bafang kits because I don’t understand if they work with coaster brake bikes. I just read the Tongsheng IS compatible with coaster brakes. Can you confirm this? Any other insights you might have for me. Much appreciated. Thanks.


    • Hi Aaron,

      The Bafang wouldn’t be compatible with a coaster brake because of the motor freewheel. There is a coaster brake-specific Tongsheng TSDZ2 motor – I couldn’t find one on Amazon or eBay, but there’s a US based Tongsheng supplier called Eco Cycles who may be able to get one.


  • Hi
    I agree that the torque sensor on the TSDZ2 is sweet.
    I installed a TSDZ2 on my Trek commuter bike using Kobalt 40V batteries. It works great about 90% of the time but it occasionally loses power and gives no assist for a few minutes and then randomly comes back on. There is never any change on the controller. It still shows the battery level and looks totally normal. After a random period of a few seconds or minutes, it comes back and I get assist again. I can’t figure out any rhyme or reason to it. It happens on smooth ground too and in gentle pedaling or pushing hard. The o Lu advice I’ve gotten was to adjust the speed sensor which I’ve tried every way. If anybody has a recommendation for what to check, replace, etc or another place to get help I would be grateful.

  • Hello Tony,
    I want to install a Bafang or a Tongsheng motor on a 30kg (61.73 Lb) bike with a Nexus 7 hub.
    My need is:
    – To ride a 10km trip with 120m elevation gain (6.2 miles – 394 ft) without sweating at all (to meet clients!).
    => Do you think this eliminates the Tongsheng?
    – Having the most comfortable gear-shifting behavior. I mean without motor a just release the pressure on the pedal during the shift, and re-apply the pressure right after. I don’t want to stop pedaling for ex.
    => What about both motors regarding that?
    – Do you think a 250W motor is enough for this weight?
    – Is there a risk to get more wear on the Nexus 7 with one or the other? How to mitigate that?
    Thanks a lot :).

    • Hi,
      I would definitely go for the Bafang on a heavy bike, preferably the BBS02B 48v variant. To cover that distance and elevation gain quickly and without sweating, you’re going to be looking at the 500w or 750w version. I’ve installed a BBS02B 750w on several bikes with Nexus 7 and Nexus 8 without any long-term issues. You will need a gearshift sensor, and you’ll need a USB programming lead and free software. When using a geared hub you will want to dial back the pedal assist ‘start current’ to 5% – it’s not advisable to use a throttle with a geared hub. Also, I would limit the ‘max current’ to 18 or 20A.

      I hope this helps, let me know if you have any more questions.


      • Hello Tony,
        Thank you so much for the quality and the level of detail of your answer!
        At this point this is enough to remove the last questions I had.
        I will come back in case I have more questions.
        Thanks again :)!

        • You’re welcome👍

  • Bonjour,
    Je cherche à installer un moteur central sur un beach cruiser à rétropédalage. Le BBS02 n’est pas compatible du fait de sa roue libre, qu’en est-il du Tongsheng ?

  • Hola amigo.
    Gracias por los artículos, son muy claros.
    En el del motor Tongsheng no he visto que se pueda comentar y por eso te expongo mi duda aquí.
    Hablas en ese post de que el Tongsheng admite platos estándar 110 BCD y quería saber si han de tener alguna caratcterística especial o vale cualquiera.
    En mi caso, he montado un Tongsheng 750 en mi Handbike deportiva y hago rutas por etapas sobre los 60 km. La handbike solo dispone de los brazos, no hay peso del cuerpo ni la fuerza de las piernas y el perdaleo es paralelo y más empujando y tirando que pisando hacia abajo.
    El caso es que un plato de 42 t se hace casi imposible de mover en cuestas arriba con cualquier desarrollo ded piñones que le metas (hablo de ir sin batería que es lo que me preocupa) por lo que mi combinación ideal es un plato de 32 dientes (disponible en 110 BCD) con un cassette de nueve velocidades 11-50 t. (tengo un cambio Sram X0 de 9v)
    Quería confirmar que lo del plato es posible y mantiene una buiena línea de cadena o no ser altera la que trae con los platos específicos y si puedes recomendarme algún plato y cassete de las características indicadas.
    Muchas gracias

    • Hola,
      Un plato de 32t 110BCD debería funcionar bien, aunque puede haber un compromiso en la calidad del cambio (particularmente en las marchas bajas). He instalado platos de 34t y 36t en el TSDZ2 en el pasado sin mayores problemas, por lo que definitivamente valdría la pena intentarlo. Por favor, avíseme cómo van las cosas.
      Saludos Tony

  • First, great articles, best source of information I have found 🙂

    I’m about to order a BBS02 750W with batteries from the shop in your links, but the pre-order service is not very good. So, two questions:

    1. In your experience, is Bestebikes on AliExpress thrustworthy? Or where do you order from (I’m in Norway, so no EU warehouse, must send from China….)? Risk of being cheated is more important than price.

    2. I cant decide between the batteries, choices are no-brand 48v13ah, no-brand 48v17ah or samsung 52v17,5ah. I will reprogram according to your advices. My previous experience buying batteries on AliExpress is that there are a lot of counterfeit premium batteries samsung/LG/etc sold so I might as well just buy the smalles, cheapest pack as it is enough for my daily 8 miles commute?

    Thank you in advance!

    • Hi Kjetil,

      I used to buy a lot of kits direct from China from Bestebikes and they used to deliver to the UK in about 10 days, but that was before Covid. I would imagine delivery will take more like 3-4 weeks, especially for the battery as that has to be sent by a different method. Batteries used to take 21-28 days to get to me from China. I’ve never had any major problems with their kits.

      Regarding battery, if you’re only doing an 8 mile commute, the 48v 13Ah should be adequate. The last Bafang BBS02B purchased from Bestebikes with their 48v 13Ah battery was getting 30-35 miles from a charge (using mixed assist).

      If you wanted to buy the battery separately, UnitPackPower are the best supplier on Aliexpress – I’ve brought around 100 batteries from them in the past and not had a single issue and their customer service is excellent. Here is the link to their Aliexpress battery store.


  • Hello,

    I just had the BBS02B 48V 750W installed on my Bacchetta A26 two wheel SWB recumbent bike. I went with the 48V 17.5 amp battery. Balance is a major issue with a two wheel recumbent when starting off or going slow. Without the motor, I would gear to the largest cog, clip in with one foot and push off to get up to speed for maintaining balance. To prevent damage to the motor should I use the throttle to start or just clip in with one foot using say PAS 2 and push off. With the extra weight of the motor and battery, I don’t think starting with the unit off a good option. I’m using the DPC-18 display with 9 PAS levels. What do you think?

    Thank you,

    • Hi Larry,

      Using the throttle to start will definitely make things a bit easier. I would recommend getting a Bafang programming lead and re-configuring the ‘start current’ on the throttle setting to around 10% and also making sure you are in a fairly low gear (particularly if it’s a hill start) to avoid any unnecessary load on the motor.

      All the best,

      • Hi Tony

        We are starting to import electric bikes into Australia, most are commuter 250w hub drive but some will be a high spec full suspension MTB, most will be 250w Bafang M400 but a small QTY was to be M600 with 48v 14AH battery in the downtube, however we have just found out that the M600 had nylon cogs replaced with steel because of high failures, which fixed the problem but it is now quite noisy.
        1. Do you have any experience with the M600 with & without nylon cogs
        2. What alternatives would you suggest in good quality Chinese motors for a fair bit of extra power over M400 250w?
        3. Where are you located? We are in Melbourne Australia.
        4. Also Shimano Deore is long delivery at present, how do you think Alivio compares?

        Thankyou for you balanced view of Bagang vs Tongsheng above, if you could reply promptly I would be very grateful.
        Russell Davidson
        MD One Bike

        • Hi Russell,

          Apologies for the delay in getting back to you. If you can send me over an email to: cycletek@outlook.com I can answer your questions in more detail.

          I’m based in Cornwall in the South West UK.

          Regarding Alivio vs Deore, I use an Alivio rear derailleur on my touring bike and it still works a treat even after 6000 miles.


  • La verdad es que el sensor de par puede resultar en un pedaleo asistido más natural pero a veces puede resultar en una falta de ayuda cuanto más se necesita, me refiero a que con un sensor de par el motor da “más” cuando nosotros damos “más” pero puede ser que nosotros no estemos para dar “más” pero si requeriramos del motor su máxima potencia, para esto sería mejor el PAS del Bafang.

    • Gracias por tu comentario, estoy totalmente de acuerdo contigo en este punto. Además, es muy fácil volver a configurar los ajustes de asistencia de pedal utilizando el software Bafang para hacer que la asistencia de pedal sea muy suave y progresiva simplemente modificando algunos de los parámetros básicos.

      • Regrets, my Spanish isn’t up to a coherent reply. But in English I can write that the Tong Sheng PAS in combination with a thumb throttle can really help dial in your power need. It took me a bit of practice to use the thumb throttle while pedalling and not produce a surge in power greater than I desired but I now use this technique more than bumping up to the next assist level.

        • Hi Guy,

          Thanks for sharing, much appreciated.

          All the best,

  • Tony – part of your conclusion when you compared the TSDZ2 vs BBS02 says:

    “Unfortunately I have had a disproportionately high amount of controller failures with the BBS02, and my confidence in their long term reliability has been tarnished. To date I have had no major issues with any TSDZ2 I have installed”

    Is the Controller built into the BBS02 motor somewhere then – if so, is it easily accessible, and not too difficult and costly to replace?


    • Hi Steve,

      The BBS02B controller takes about 5 minutes to remove. Generally speaking in the last 12 months I’ve had no reported controller failures, but I now limit maximum amps to 18A and change the start current on pedal assist and throttle to no more than 10%. Plus I’ve stopped using 52v batteries. A new controller costs anywhere between £70-£100 to replace, depending on where you get it. Aliexpress is usually the cheapest, but you need to make sure you’re getting from a trusted supplier and a genuine Bafang controller.


  • Hello Tony! Please tell me which motor is less noisy?
    I prefer TSDZ2 due to the single cadence of pedaling, but I am concerned about its noise level, on some youtube videos

    • Hi Oleg,
      The Bafang motor is much quieter than the TSDZ2, which is a shame because the pedal assist is much nicer on the Tongsheng. I find the noise levels on the TSDZ2 vary quite a bit from motor to motor, some are reasonably quiet others are quite noisy – it’s luck of the draw.

      I hope this helps.

      All the best,

    • I own both a Bafang and a Tongsheng equiped bike. The Bafang motor is probably quieter than the Tongsheng motor, however I do no do not find the whirring sound generated ny the Tongsheng motor to be noticeably objectionable. Given that the wind noise and other sounds from me riding on the street makes whatever sound coming from the motor less noticeable. This could vary depending on where you are riding and your sensitivity to the sound from the motor. It doesn’t bother me.

  • Dear Tony
    Thank you for this very helpful article. I am 56 and 95kg, and have a medical muscle condition where at times and am unable to pedal at all and will need throttle assist. I want to electrify a MTB to ride with my son (24Y). I would like to pedal a bit when I can. I am in South Africa and it is legal to own such a bike, even 1000W. Will you be able advise on the correct setup, and frame choice? I see many BB choices too – how is that choice made?

    • Hi Farrel,

      The ideal donor bike would be a hardtail mountain bike with a standard thread bottom bracket shell of between 68mm-73mm wide. The Bafang BBS02B 750w would be a good choice, as it is powerful enough to be used ‘throttle only’. The only problem with these motors is they can be unreliable if full throttle is used when climbing steep hills. I usually reprogram the controller to limit the maximum current to 18 Amps, and set the throttle start current to 10%. There should be a link in the article about programming the BBS02B – it is fairly straightforward and all you need is a laptop and USB programming lead. You should only use a 48v battery with the BBS02B as I have found 52v batteries can compromise reliability. Something like a 48v 17Ah battery will give you a range of between 50-70 miles. Here is a link for a trusted supplier that ships the full BBS02B 750w kit with 48v 17Ah battery.

      If you need any more advice, please let me know.

      Kind regards,

  • Hi Tony

    Thanks for all very helpful information you are sharing. I really enjoy reading all your articles and reviews (mostly on mid-drive motors). They really helped me a lot.
    At the beginning I tried Scott’s e-bike with Bosch mid-drive and I found out that it is “the right thing”. But e-biks are pretty expecive and I started to look for cheaper solution. After long period of thinking and evaluating (and reading your reviews for many times) I decided to mount Tongsheng TSDZ-2 36V/350W and 17,5Ah battery on wife and my bikes. We have low-mid cost MTB’s (hard-tail) and we are not downhill fans. So we ride mostly on paved roads and trails.
    Installing was a little bit of challenge (as you wrote could be), but after 2 afternoons bikes was ready. We rode 44 km yesterday and it was great.TSDZ-2 and battery are exactly what we need.

    This time I have no question, but I’m certain this will change in future .

    So please keep it up and many thanks, Matjaz

    • Hi Matjz,
      Thanks for sharing your experiences with us. Glad you’re enjoying your Tongsheng conversions. I’m always here if you need any help or advice.
      Have a great weekend!

  • Hi from Australia, I’ve used 2 Tongsheng drives on road bike with Gates and NuVinci hub drive, both motors worked GREAT but unfortunately they develop noise issues , l had to replace Spragg clutch at 1100kms blue gears okay, replaced internal bearings and spragg bearing with Japanese and German equivalents. The internal friction noises rubbing and creaking are from torque sensor unit which has two faces rubbing 100% of the TIME. These noises developed at 1500kms approx, second motor is making similar noises at 700kms, I’m about to replace 36v Tongsheng with BBS02B , hoping to have no noises.
    Can anyone tell me if BBS02B is progamable using available software and USB CABLE?
    Hope this information is useful, Tongsheng motors are GREAT to use but torque sensor unit is a let down.

    • Hi Kevin,
      Thank you for sharing your experiences with us. The Tongsheng has the potential to be a great motor, if they improved the durability of the components. Regarding the Bafang BBS02B, I covered over 3000kms without any issues. The BBS02 is easy to program using the USB lead and you can really make the power delivery smooth and progressive. I used ‘Karls special sauce’ programming parameters. Here is a link to the details, there is also a link to the free software download.

      All the best,

      • Tongsheng has changed the torque sensor. It is now not dependent on the three small springs to keep the contact disk in position. Instead they use magnetic force.
        I have changed a couple of them, certainly an improvement an not expensive.

        • Hi Birger,

          Thanks for the information. It’s good that Tongsheng keep making improvements. The latest model seems a lot more reliable than the earlier versions.


  • Hi Tony, I had a Tsdz2 installed on my Intense Uzzi a month ago. Initially, I was very pleased with the results. But after 160km, I noticed a great deal of creaking and groaning from the bottom bracket. Removed the emotor and found that the guy I got the TS from in Malaysia, had hacked off a large chunk of the Uzzi’s down tube so that the emotor could nestle there. He had just slapped the whole thing together again using just epoxy. Moral of the story is, when you send a frame to have an emotor fitted, you must send it to someone who knows what he is doing. I even told the clown he couldn’t drill a hole in the tube when he wanted to. So now I have a ruined frame. Wish I could post a pic of the damage!

    • Hi Mak,

      Sorry to hear that. I would take your bike back to the person that bodged the conversion and ask for compensation. Those Uzzi frames are expensive.

      Let me know how things go.

      All the best,

      • Hello Tony
        A brilliant site. Lots of good info. I need to electrify our tandem and tsdz2 36v 250w 15mph looks ideal from your reviews.
        Probably will not fit front drive where only an extension speed sensor cable needed. Can fit to rear but need extension 6 pin controller cable to reach the front bars.
        Can you assist in identifying a source of a suitable cable?
        I will buy both and see if I can modify the eccentric but the alternative fallback is essentiall before I buy the kit.
        Many thanks
        Dave Pipe

        • Hi Dave,

          Can you let me know the make and model of the tandem please, and I will check compatibility. If it has the usual configuration of L/H/S front chainring going to a L/H/S rear crank with a R/H/S rear crank going to the gear cassette then I can’t see it being feasible. One thought that did cross my mind though was installing the motor on the front and running the chain to the inner chainring at the rear (assuming there is a compact double crankset fitted at the rear). I can’t say whether this would work as I’ve never tried it. I will check with my suppliers to see if there is a display to controller extension cable available.


  • I’m hoping to convert a Trek hybrid to an ebike. I have long term sciatic pain and I’m about to start touring in a campervan.
    I think I would like the Tongsheng TSDZ2 48v 750w version.
    Is this legal in the EU and UK? I have a full motorbike license.
    Also what battery would be optimal for this motor?

    • Hi Eric,

      The 750w version would not be legal for road use in the UK or EU, unless there was a way you could get your bike approved and registered by the DVLA.

      It would be subject to the same rules as a moped – insurance, lights, indicators etc.

      I’ve converted quite a few bikes using 250w version for customers with knee problems and they have found that to be more than adequate.

      If you did decide to go for the 750w, I have fitted quite a few of these 48v 13ah batteries without any issues.

      If you need any more advice, please let me know.


  • I started looking into mid drive conversions for my old cannondale Jekyll earlier this summer and came across Tonys E bike choices blog , I must say this guy knows his stuff and cant do enough to assist you.After a long chat i was sure the Tongshen was for me as i wanted the torque assist and not just create an electric moped ! I am located in South Suffolk so located quite a way from Cornwall but being a hands on type of person was more than happy to tackle the conversion. My cannondale being a full suspension bike did need a minor modification to the swing arm but apart from that installation was straighforward enough. I have now covered 200 miles and apart from occasional chain off situation when down shifting too fast i can say it has transformed my bike into a stealth hybrid and i can now commute to work with assist and not need a change of clothes and ride home for a workout !
    Many thanks Tony for all your help

    • Hi Andrew,

      Thanks for your positive comments. If you ever need any more assistance, give me a shout.


  • I have bbs2 on my Mtb and also tongsheng on my. Rickshaw tricycle ,taxi bike where i transport. 2 more peoples around the city. The blue gear broken after one month. I take the metal gear also 1 month was Broken .
    So if the bafangs gear stronger i dont try to my Rickshaw i definitely say bafang. But. I need to try. Because ones the month geañr fñor 25€ costs lot and Steeling my time

    • Unfortunately the blue gear is a weak point on the Tongsheng, especially if you are carrying a lot of weight. You would definitely be better off with a Bafang BBS02 or BBSHD on your Rickshaw.

      • Blue gear is a weak point on Tongsheng but can be easily replaced with a metal gear. This adds a bit of noise but addresses reliability concerns. I do like the natural way the power comes on with the Tongsheng which made this worth it for me.

        • Hi Dave,

          Thank you for your comment. I totally agree, the TSDZ2 is a great motor and the extra noise you get with the metal gear is minimal in my opinion.


          • Thanks for your articles. Really helpful. Would either the a Tongsheng or Bafang motors work with a rear Shimano Nexus 8-Speed Internally Geared Hub, Centerlock Disc, 32H?
            Or would you only recommend on bikes with standard external derailleur gearing? Cheers

          • Hi Jamin,

            I have installed both the Bafang BBS02 and Tongsheng on bikes that use the Nexus 7 / 8 and Alfine geared hubs. I always used a gearshift sensor on the Bafang installations as the motor produces a lot more power than the TSDZ2. I’ve only ever installed a 250w Tongsheng on an IGH bike, so didn’t need to use a gear sensor, I just eased up on the pedalling when I shifted gear.

            Out of all the conversions, I never had any customers report back with any issues despite covering big mileages. If you are going to install a BBS02, I would also get a programming lead and dial back the start current to about 5% in the controller settings (it’s set to 20% which is too high for an IGH).

            I’ve also fitted a BBSHD to a bike with an Alfine 8, and that seems to have survived.

            All the best,

  • Good comparision.
    I´ve been a BBS02 fan for years because of it´s good power, programmability and robustness.
    Now i´ve tried two Tongshengs, one for my wifes trailbike, one for commuter bike and have to say that for serious MTB action this is the better motor. It works fine out-of-the-box, needs no special programming (which is much more complicated than on the BBS). The noise is far away from what my Bosch Performance is producing, this was different for the “older” from 2014 – 2016. Yes, ground-clearance as well as chainline is worse than Bafang, but still acceptable. In Germany, the Tongsheng can be found for 320 € on eBay, which is 20 % less than a BBS02.

    When robustness is only limited by the blue nylon gear, this is no problem. Time will tell.

    • I agree, the BBS02 is a great motor. I covered just under 2k miles in under 12 months and never had any issues.

      I’m planning on building a utility e-bike this Spring/Summer for small shopping trips. My doner bike is going to be a Kona UTE or Surly Big Dummy and will be using the TSDZ2 as I prefer the torque sensing pedal assist.

      It is definitely a more refined motor than it used to be, and the general reliability has improved.

      • Hello,
        I need a mid-engine for my wife’s bike. She’s not very sporty, so I need an engine with 100% support, especially since the way to our house has 13% incline. My wife has a city bike that I want to rebuild. Bafang or TSDZ2 ?
        Regarding the TSDZ2 I’ve read that the 36V 250W version should be more powerful than the 36V 500W version. Is that correct ? And what’s about the 36V 350W version?

        Thank you, V.E.

        • I have installed and ridden all of the above versions of the TSDZ2 and the 500w has noticeably more power than the 250w version. The difference between the 36v 250w and 350w model is minimal. The Bafang BBS02B 36v 500w (36v x 25A) is considerably powerful than the TSDZ2 36v 500w (36v x 16A).

          I personally prefer the torque sensing pedal assist of the TSDZ2 (my ebike has the 36v 500w version fitted), but for maximum pedal assist the Bafang is hard to beat.

          If you require any more information on these motors, please let me know.

          All the best,

      • Hola espero me ayudes a elegir, le quiero poner asistencia a una Trek Roscoe, mtb trialeras caminos mixtos y pendientes de todo tipo, que me dure unos 50kms promedio, veo que los kits no manejan batería cuál y que marca sería lo ideal para las recomendaciones y motores que me indicas, saludos.

        • Hola,
          tu Trek tiene un soporte inferior roscado de 73 mm, por lo que una Bafang BBS02B 750w o 500w sería una buena opción. Para un alcance de 50 km, recomendaría al menos una batería de 48v 13Ah. Para un rango de alrededor de 100 km, algo como 48v 17.5Ah sería mejor. Deberá verificar el tamaño de su marco, la batería no cabe dentro de un marco pequeño y los orificios para la placa de montaje de la batería no siempre se alinean con los orificios del portabotellas. Si este es el caso, es posible que necesite una batería más pequeña.

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