(使用客户保证模块进行编辑)
(使用客户保证模块进行编辑)
(使用客户保证模块进行编辑)
This steel gear solve the problem of nylon gear's short life. It is more durable than nylon gear. It design for Bafang BBS01B BBS02B and BBSHD mid-motor. The working sound is about 80db, the noise is louder than nylon gear, but it does not affect the riding experience, and it can not be felt when riding.