Set Includes: 3-speed left shifter +7-speed right shifter, aluminum body; 1.5m cable for left, 2.1m cable for right Features 1 Complete 3×7 combo fully compatible with 21-speed mountain bikes, for 3 front chainrings &7 rear cassettes 2 Integrated brake and shift combo, one pair controls both braking and gearing for full bike replacement 3 Internal metal gears deliver crisp, precise gear shifts with smooth consistent feel 4 Separate adjuster screws for brake and shift cable, easy fine-tuning for all riders 5 Extended 3-finger brake lever for ergonomic grip and powerful reliable stopping 6 Transparent numbered gear dial, clearly shows 3 front gears &1-7 rear gears to avoid mis-shifts 7 Heavy-duty wear-resistant aluminum housing, standard handlebar size for direct repair & upgrade replacement
