Enhanced Riding Experience: Upgrade your bike with our 21-speed derailleur and shifter set, designed for optimal performance in mountain biking and trekking. Construction: Crafted from materials, our bike derailleur and shifter set withstands rigorous use in diverse terrains. The robust mechanism ensures long-lasting reliability and performance. Complete Kit: Each package comes with a full set of shift levers, brake system, and a shift cable, providing everything you need for a quick setup and go. Ideal for DIY enthusiasts and professional cyclists alike. Universal Fit: Designed to fit most mountain bikes, this versatile set enhances your control and efficiency, making it a perfect choice for both casual rides and competitive events. Color: As Shown Material: Aluminum Alloy Package Contents: 2 x Cycling Disc Handle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.