Description: Integrated design provides shifter with high stability and maximum safety, which allows for stable and smooth speed shifting. Adopting low-friction technology coating, the shift cable saves great effort for speed shifting, allowing you to ride more easily. Wear-resisting PA nylon guide wheel allows for quiet and smooth operation without wearing the chain, which is easy to maintain later. You can use both of the left and right shifter for 3x7 speed, which easy to use and maintain, perfect for mountain cycling enthusiast. The shift lever is perfect for mountain bikes, road bikes or folding bikes speed shifting, minimizing hand fatigue for long rides. Item Name: Speed Shifter Material: Aluminum Alloy Actuation Ratio: 2:1 Left Shifter: 3 Speed Right Shifter: 7 Speed Front Derailleur: Mounting Clamp Size: 31.8-34.9mm, Fit Maximum 42T Crankset Rear Derailleur: Universal for 7-8 Speed, Medium Cage Derailleur, Supporting Maximum 32T Flywheel Specifications: A: 7-Speed Right Shifter, B: 3-Speed Left Shifter, C: Front Derailleur, D: Rear Derailleur Features: Low Friction, Smooth Performance, Wear-Resisting Size Details: Style A, B Length: 10cm/3.94" (Approx.) Style C Length: 14cm/5.51" (Approx.) Style D Length: 11cm/4.33" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Speed Shifter