[Wide application] Suitable for mountain bike, city bike, road bike, folding bike, etc. [3 gear design] You can use only left gear shifter for 3 speed and only right shifter for 7 speed and both left and right shifter for 3x7 speed. [How to use] Right shifter is a -type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts. Buy Apex Lenses Replacement Lenses for Roka AT-1 Sunglasses: Shop top fashion brands Replacement Sunglass Lenses at FREE DELIVERY and Returns possible on eligible purchases Enhance your cycling experience with this versatile gear shift lever set, designed for 3/7/21-speed mountain bikes, providing smooth and precise gear... Bike Shifters, One Pair Outdoor Mountain Bicycle, 3X7 Thumb Left shifter is a friction/ ratcheting thumb lever for triple cranksets. Features: 1. The thumb gear shifters is made of aluminum alloy material, it works perfectly for best performance and maximum safety and longevity. 2. Right shifter is a -type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts. material]The thumb gear shifters is made of aluminum alloy material, it works perfectly for best performance and maximum safety and longevity. [Convenient to use] It can help you quickly control the gear of the to adjust the speed of the , so that the ride is more stable and . Mountain Bike Gear Shifter Shimano Tourney TX30 3x7 Spd Shifter Set - Cambria Bike Mountain Bike Shifter