ST-EF51 Set 3x7 Speed Shifter Brake Lever Combo MTB Bicycle Bike 21 Speed Brake/Shift Lever W/Brake Cable for Mountain Bike

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Compatible with Front 3 gear, Rear 7 flywheel and 21 speed positioning transmission system
Make wider gear display vision, just take a glance at speed changes.
Scope of application: 21-23mm diameter handle bar
21-speed transmission, ergonomic design of position and trigger handle.
Package includes: 2pcs Transmission (Left 3 speed / right 7 speed), 2pcs Brake line

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