3x7 Speed ST-EF51 Sets 21 ShifterBrake Lever Combo V-Brake Front 3 Gear

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