Electric conversion kits: the guide

Turn your bike into an e-bike, tailored to your needs — workshop fitting, advice and after-sales service in Prilly.

Three motors, three ways to electrify your bike

From lightweight city bikes to the most powerful pedal-assist motors: we’ll help you choose and assemble everything in our workshop.

250 W rear-wheel motor
New for 2026
Keyde

250 W rear-wheel motor

Lightweight, discreet, quiet: the ideal kit for the city and leisurely rides.

  • Approx. 4.2 kg including battery
  • 12 mm thru-axle or quick-release
  • Torque sensor integrated into the crankset
  • Legal 250 W on the road
SFr. 1,290.00
BBS pedal motor
Best-selling
Bafang

BBS pedal motor

The highest torque: hills, heavy loads, trailers, mountain biking. From 250 to 1,000 W depending on use.

  • Up to 160 Nm of torque
  • External batteries, luggage racks or panniers
  • Compatible with 99 per cent of bikes
dès SFr. 1,090.00
Top-of-the-range rear-wheel motor
Premium
Grin Technologies

Top-of-the-range rear-wheel motor

The benchmark Canadian motor: reliability, performance and fine-tuning with the Cycle Analyst.

  • Exceptional build quality
  • Programmable Phaserunner controller
  • For the most demanding riders and long distances
SFr. 990.00

You keep your bike

A bike you’re familiar with, without having to buy a whole new one.

Scalable and repairable

No obsolescence: batteries and accessories remain compatible.

Workshop assembly

Advice, fitting and after-sales service in Prilly, for all makes.

24-month warranty

Everything is included in the kit, even the tools — one price, no hidden costs.

Bafang mid-drive motor: torque above all else

The best-performing solution for those looking for torque, natural assistance and effective performance on uphill sections.

Ideal for: daily commutes with hills, mountain biking, trekking, utility cycling, towing and carrying loads.

Its strengths: a motor with plenty of torque, excellent on climbs, dynamic assistance, numerous customisation options, perfect for intensive use.

View the Bafang kits

250 W rear-wheel motor: lightweight and discreet

Compact and quiet, ideal for adding electric power to a city bike, trekking bike or leisure bike. 250 W motor (280 RPM), 36 V 10 Ah Mini Bottle battery, LCD display and controller integrated into the battery: installation is simple and neat.

Ideal for: urban commuting, journeys without significant gradients, leisure rides.

Key features: up to 40 Nm, approx. 4.2 kg with a 360 Wh battery, 26–28-inch wheels, 8–10-speed cassette, 135 mm quick-release or 12 mm thru-axle (142 / 148 mm) with a torque sensor integrated into the crankset, disc or rim brakes, 20 to 60 km range, 250 W legal on public roads in Switzerland.

Discover the Keyde kit

Which kit should I choose?

Choose

The Bafang mid-drive motor, if…

  • you often ride uphill
  • you’re carrying a heavy load or towing a trailer
  • you’re looking for maximum torque
  • you want the highest-performance solution
Choose

The 250 W rear-wheel motor, if…

  • Do you mainly cycle in town or on gentle terrain?
  • you’re looking for a lightweight, unobtrusive bike
  • you want a simpler setup
  • you prefer gentle assistance for everyday use
Not sure?

We’ll help you choose

Send us a photo of your bike and tell us what you use it for: we’ll usually get back to you the same day with the right set-up.

A conversion kit turns your existing bike into an electric bike (e-bike): it adds a motor, a battery and a control unit, without changing the bike itself. This guide explains how to check your bike’s compatibility and how to choose the power output of a mid-drive motor.

Is my bike compatible with an electric conversion kit?

In 99 per cent of cases, yes. A few simple checks are all it takes before you buy. If in doubt, send us a photo of your bike via the contact form: we’ll usually get back to you the same day.

Bafang mid-drive motor: 3 checks

Mesure du boîtier de pédalier
1. Measure the width and diameter of your bottom bracket.
Grille des kits compatibles selon les mesures du boîtier de pédalier
2. Check the table of compatible kits to see which one applies to your bike.

3. Do you need an adapter? It depends on the type of bottom bracket:

Bottom bracket type Width Accessory
Standard BSA 68–73 mm None
Hollowtech 68–73 mm None
Press-fit 86–92 mm Lekkie adapter
PF30 68–73 / int. 46 mm Lekkie PF30

Rear wheel motor kit: what to check?

You need to check the rear wheelbase, wheel size, cassette type and the space available for the battery. Good news: all our wheels are compatible with disc brakes and rim brakes, and we cover both mounting standards:

  • 135 mm quick-release: the classic standard for city bikes and older mountain bikes.
  • 12 mm thru-axle (142 / 148 mm): the modern standard for recent bikes (mountain bikes, gravel bikes, road bikes with disc brakes). The Keyde kit is designed for this standard, with a torque sensor integrated into the crankset: no external pedalling sensor, a cleaner fit and more natural assistance.

What power rating should you choose for a bottom bracket motor?

The 500 W is the best-selling model in Switzerland: it provides all the power you need whilst remaining within legal limits. The 750 W and 1000 W models are for private use only (prohibited on public roads and paths).

Power Max. torque Use
250 W 80 Nm On flat terrain, rides with no elevation gain
350 W 90 Nm On flat terrain, with little elevation gain
500 W 110 Nm Everyday use and leisure rides, carrying loads, all gradients
750 W 130 Nm Very powerful, mountain biking (private land)
1000 W 160 Nm Heavy loads (private use)

Which battery should I choose?

All our batteries are fitted with Samsung cells and a high-quality BMS. We work with you to assess feasibility, the required capacity and the most discreet integration possible.

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36 V · 10 Ah

Mini Bottle

Lightweight (2 kg); limited range, but sufficient for the rear-wheel motor.

The most common

Bottle cage

Fits onto the bottle cage bolts: the most suitable battery for all bikes with space for integration.

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If there’s no room for the frame

Luggage rack

For any bike with luggage rack mounts. Off-centre centre of gravity: to be used only when a bottle cage cannot be fitted.

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Made to measure

Tote bag

Fits all bikes; made to measure according to your requirements and the frame’s specifications.

On video

Electrobike Zone Conversion Kit

A look at a bike fitted with a Bafang kit.

Fitting the Bafang BBS motor

The stages of assembly in the workshop.