Bafang BBS02 mid drive electric bike conversion kit. This review is based on my own personal experiences installing over seventy of these units over a 5 year period. I really like the Bafang motor and it is an excellent motor,this is definitely not a motor to fit and forget.
Bafang BBS02 motor is available in three different configurations: 36v 500w / 48v 500w and 48v 750w. The 750w version is the most popular as it offers the most bang for your buck! The motor itself is physically the same as the lower powered BBS01 250w / 350w, the only difference being the internals and controller. The installation criteria is the same as the other Bafang units for the classic 68mm-73mm bottom bracket fitment, this motor is also available with a bottom bracket shaft extension to allow fitment to Fat bike bottom bracket sizes of 100mm and 120mm.
This Electric bike kit comes with the following components:
The motor unit with integrated controller
Inner and outer lock-nuts
Brake levers with cut-off sensors (only compatible with cable brakes)
Speed sensor and wheel magnet
A bag of various Allen bolts and screws
Bafang BBS02 mid drive motor Technical Data
This electric motor produces considerably more torque than its smaller siblings (up to 120N.m), I have listed the peak power output for all the motor and battery configurations below:
Bafang Battery Peak Power
BBS02 36v500w 36v (42.2v x 25A) 1055w
BBS02 48v500w 48v (54.4v x 18A) 864w
BBS02 52v500w 52v (58.8v x 18A) 1058w
BBS02 48v750w 48v (54.4v x 25A) 1200w
BBS02 52v750w 52v (58.8v x 25A) 1470w
The motor kit is supplied with a thumb throttle, but I would exercise caution when using this. Heat dissipation is not as good on the BBS02 as it is with the BBSHD and even the latest ‘B’ version of the controller (with the upgraded INRFB3077 MOSFETs) can be prone to premature failure when using a throttle inappropriately.
If you need to use the throttle regularly, it would be worth changing the throttle ‘start current’ settings in the controller firmware (you will need a compatible USB lead and software).
It is crucial to be in a low gear on steep hill climbs or starts, as subjecting the motor to unnecessary load can cause the controller to blow.
Personally, I am not a big fan of these throttles. They are not particularly good for modulating the power, and function more like an on/off switch, although reprogramming the controller can make the throttle more user-friendly.
As with all the other Bafang models, the controller firmware settings can be changed with a USB programming lead and software (which you can download for free here). If you are doing this for the first time you should exercise caution and do your homework first. A good source of information on Bafang programming can be found on this excellent thread on Endless Sphere.
This kit is available with either a 44t, 46t or 48t steel chainring. If you are climbing lots of steep hills, I would definitely recommend an aftermarket chainring of around 36t.
One thing you will have to be aware of, if you do fit a smaller front chainring, the substantially lower gearing can make the bike prone to power wheelies, especially when hitting full throttle in a low gear on a steep hill start.
If you want to fit the brake levers with cut-off sensors, then bear in mind that these are only suitable for cable operated brakes. I would only recommend installing this kit on a bike with decent hydraulic brakes. Because this motor is so powerful, I would recommend the hydraulic brake cut off sensors or completely new hydraulic brakes with the sensors already built in.