Features:
21-speed transmission,ergonomic design of position and trigger handle.
Make transmission easier operation, lower division, visualization of the gear display, speed
changes at a glance.
Easier operation,lower division.
Specifications:
Condition:100% Brand New
Compatible for:Front 3 gear, Rear 7 flywheel and 21 speed positioning transmission system
Scope of application: 21-23mm diameter handle bar