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I recently discovered this new twist on old idea and felt compelled to dig a little deeper. In this overview of the Rubee X e-bike conversion kit, I’ll take a closer look at the specs to see if it’s a worthy alternative to the masses of hub drive conversion kits available. As always, I’ll try and get hold of a sample of the Rubee X to review as soon as possible.


Rubee was started way back in 2012 with the idea of creating an all in one e-bike conversion kit that could be fitted to practically any bike. Version 1.0 of the kit became available in 2013 with subsequent models released in the ensuing years.

Fast forward to 2021 and the latest version – the Rubee X, is now available.

Tech specs overview

I’ve never been a fan of friction drive systems, although I can understand their place in the world of e-bike conversions. The idea behind this type of conversion kit is simple – the electric motor drives a rubber wheel which in turn drives the rear wheel of the bicycle it’s fitted to.

rubee x ebike conversion kit
The Rubee X is the easiest way to add e-assist to your bike (Images courtesy of Rubee)

Early friction systems were very basic and usually quite heavy. There wouldn’t be any pedal assist and the motor would usually be activated by a switch, so it would either be on or off.

Rubee have taken this design to a whole different level and added a clever wireless pedal assist sensor, modular battery pack and regenerative braking. There’s also a smartphone app to control everything. The whole system is contained within a single, compact unit that fixes to your seat post.

The weight has also been substantially reduced with the base model weighing in at just 2.8kg.

Battery Battery Battery (base model)
Speed 32 km/h / 20 mph 25 km/h / 16 mph 25 kmh / 16 mph
Power 350W 250W 250W
Range 48 km / 30 mi 32 km / 20 mi 16 km / 10 mi
Charge 3 h 2 h 1 h
Weight 4.0 kg / 8.8 lbs 3.4 kg / 7.5 lbs 2.8 kg / 6.1 lbs
rubee x modular battery system
The unique Rubee X modular battery design

Battery specs (per module)

Voltage 36 V
Capacity 93,6 Wh
Weight 0.6 kg / 1,3 lbs
Chemistry Li-Ion
Battery life 1000 cycles


According to their website, the Rubee conversion kit is compatible with 16″- 28″ wheels with tyre width of 0.5-2.5″ and can be fitted to rigid or full suspension frames. Personally, I can see potential issues on full-suspension bikes and it’s unlikely this kit could be fitted to a dropper seat post.

rubee x electric bike conversion kit
The Rubee X can be installed and removed in a matter of seconds

Who is the Rubee X aimed at?

The Rubee X is going to be popular with commuters or cyclists who are looking for occasional assistance when they ride hillier routes. If you already have a folding bike and don’t want for fork out for an e-bike, the Rubee is easy to transport and will fit in a rucksack.

One of the great things about this system is the ease at which it can be installed and removed.  If you rely on your bicycle for day to day transport but only need to use e-assist occasionally, then I can see the Rubee being very useful.

view of rubee x internal
The Rubee X features regenerative braking


I’ll be contacting Rubee to see if I can get hold of a sample to review as it looks like an interesting option for someone who wants a quick and simple way to convert a bike to electric.

I like the fact that it’s a completely integrated system and could be swapped between bikes quite easily. This would be especially useful if you had several bikes in your household.

Anecdotal reports suggest the performance is more than adequate and comparable to similar powered hub motors. The battery range will be modest and even with a full compliment of battery packs should give a potential of around 30 miles (48km).

If you’re looking for a more permanent e-assist solution, then I don’t feel it would be the way to go, as you’ll limited by a maximum of 30 miles (48km) range. However if you wanted a plug and play system that was quick and easy to fit then you won’t get any easier than the Rubee.

Visit the Rubbe website for more information


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!

Tony has 228 posts and counting. See all posts by Tony

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