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Bafang BBS01b 250W 36V mid drive electric bike motor conversion kit

£439.00 inc VAT


The Bafang BBS01b is the perfect assistance kit. Get up any hill and wave goodbye to the wind. It offers pedal assistance and a throttle.  With 80NM of torque, don’t compare this to a shop bought ebike – it’s going to be far more powerful.

Please note that this kit is for the motor, screen, throttle, speed sensor and wiring harness. You will also need to choose a suitable battery if you don’t already have one.

Please view our batteries by following the links below:

36v batteries HERE


A chain wheel gives you a higher top end speed, a lower number gives you more ‘grunt’ for off road or steep inclines.

Let us know what type of brakes you have. Integrated cable brakes are where the brake lever and gear lever are one unit (ie not separate components).

SKU: MBBSO1250 Category: Product ID: 3178


The Bafang BBS01B 250W mid drive electric bike motor conversion kit is UK road legal.   It’s a small motor that fits in front of your pedals, and is subtle in appearance. It provides powerful torque, high efficiency and low noise levels.  Please read out fitting guide here.

Key information:

  • 15 amp controller (built into drive system) with upgraded IRFB3077 mosfets (ie reliable)
  • LCD Display – C965A
  • 44T/46T/52TT chainwheel – you choose!
  • Replacement cranks (both sides!)
  • Speed Sensor and magnet
  • All required cables

Can I fit this myself?

Read our fitting guide here. If you require tools to take off your bottom bracket, pedal cranks and maybe split your chain, follow this link to purchase all of the tools. You will also require a fitting wrench which you can add as an option (above).

Can I fit a 48V battery?

No – the Bafang BBS01 is designed for a 36V battery.

Will this motor fit my bike?

The Bafang BBS01 is designed to fit bikes with a bottom bracket of between 67mm and 73mm. The inner diameter of the bottom bracket should be 33.5mm. Most modern bikes sold in the UK meet this standard (but please check). We have a bottom bracket guide here.

What is the optional gear sensor  for?

The gear sensor interrupts the motor when you change gear, and gives a smoother gear change.

How about the brakes?

The kit comes with a choice of replacement brake levers if you have standard brake cables,  stick on sensors if you have hydraulic brakes, or a combination of both if you have integrated brake cable brake levers (where the brake lever and gear selector are integrated into one unit). No matter what type you have, they all cut the motor when you brake so that you are not fighting the motor when trying to stop. This is a very useful safety feature!


1 year warranty based on purchase date. Please return to us for repair or replacement.

UK Legal Status

This Bafang BBS01 kit is fully road legal.


Bafang BBS01 / BBS02 Install Guide

C965A Black and White LCD User Manual

General install advice

Additional information

Weight 3.9 kg
Dimensions 0.32 × 0.23 × 0.27 cm

Motor Type




Waterproof Grade


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