[VIP The 1 year ] Index:4
Through Authenticate 
(Mini velo modifies double ring) lengthened axle of small wheel bike, Through using lengthened axle can applicable to different size of small wheel bike, easily modify bike. Ex: Birdy.
3D-BB24 lightweight enhanced crank
N.W.:560g
Spec.:
Crank Length: 170, 172.5mm
5 arms BCD 130
Color: Black, Red, Silver
