Bafang Ultra Motor metal gear/bearings for replacement;

Bafang has upgraded the gear, it is metal gear rather than nylon gear. 

Two end bearings(6000RS) are 10mm inner diameter,  26mm outer diameter and 8mm in thickness;

The big steel gear is about 53mm in diameter; the small metal gear is about 27.5mm in diameter;

It's the third steel gear of the Bafang Ultra motor.

Bafang upgraded the M620 G510 rotor and the third gears this year to reduce the motor noise. The two rotors are the same with sizes; only the teeth are different; The two third steel gears are also different with teeth numbers, please check our pictures.  If your motor was sourced before 2023, then your motor would be with the old version rotor and the 3rd steel gear; if your motor was sourced this year, please check before ordering or buy the rotor and the 3rd gear together.  

If you want to reduce noice for your Bafang M620 motor, you can try to replace to the new rotor and the new third gear.

Bafang Ultra M620 /G510 middle steel gear for replacement

Bafang Ultra M620 G510 motor rotor with detecting sensor for replacement.

The two rotors are the same with sizes; only the teeth are different; The matching third gear for the rotor also changed in 2023;  If your motor was sourced before 2023, then your motor would be with the old version rotor and the 3rd steel gear; if your motor was sourced this year, please check before ordering or buy the rotor and the 3rd gear together.

How to take out the M620 rotor for replacement, please check below video(We will provide the tool for removeing the M620 rotor freely.):

Bafang M620 M600 M510 M500 M420 crank arm bolt/ screw;