1. Supercharge your cycling adventures with the High-Performance 21-Speed MTB Bicycle Shifter Levers and Brake. These exquisitely smooth and highly efficient shifter levers serve as the pinnacle disc handle, tailored specifically for an unrivaled trekking bike experience. 

2. Revolutionize your rides by equipping your bike with the Ultimate Disc Handle designed for Trekking Bike Cycling. This state-of-the-art 21-speed derailleur guarantees seamless and swift shifting, regardless of the terrain you conquer. 

3. Conquer every trail with confidence using the High-Performance 21-Speed Smooth and Efficient MTB Bicycle Shifter Levers and Brake. Originating from Mainland China, this rear derailleur is the go-to choice for trekking bike aficionados in pursuit of top-notch components. 

4. Unleash the full potential of cycling efficiency with the 21-Speed Bicycle Derailleur. This high-caliber rear derailleur empowers you to effortlessly navigate any terrain, making every ride a breeze. 

5. Elevate your cycling prowess with the 21-Speed Rear Derailleur from Components Derailleurs. Crafted in Mainland China, this high-performance derailleur is engineered for silky-smooth and rapid shifting on any trekking bike. 

 Description: 

☛ The left-hand side manages three shift selectors, while the right-hand side controls seven shift shifters, facilitating effortless speed adjustment. 

☛ In terms of practical usage: The visual gear position display ensures that gear changes are instantly recognizable at a glance. 

☛ Speed Regulation: The 21-speed mountain bike variable speed governor comes integrated with a brake for comprehensive control. 

☛ Ergonomic Design: The 3x7 speed shift brake handle is meticulously designed with ergonomic finger positions and a trigger-style handle for enhanced comfort and control. 

☛ Wide Applicability: It is suitable for MTB, city bikes, recreational vehicles, road bikes, folding bikes and more. 

 Specification: 

Item type: Bicycle shifter brake 

Color: Black 

Material: Aluminum Alloy 

The inner diameter of the handle mounting holes: Approximately 22.2mm 

Applicable: MTB, city bikes, recreational vehicles, road bikes, folding bikes 

Quantity: 1pc