MODEL: Bicycle rear derailleur RD-TY200, compatible with 6 and 7-speed SIS INDEX variable speed transmission systems. Advanced Gear Range: 42T Total Capacity - Handles extreme gear ranges, with a max/min tooth difference of 14T, 14-28T cassette compatibility ideal for steep climbs and high-speed flats. Multi-Speed Compatibility: Works seamlessly with 6/7-speed drivetrains and 8/7/6-speed chains. Perfect for mountain, road, and hybrid bikes. Ultra-Durable Build: High-Quality Aluminum Alloy - Lightweight yet tough, built to withstand mud, water, and heavy-duty riding. Pulleys for silent, long-lasting performance in all conditions. Wide Application: Fits standard 6/7-speed direct mount, making it ideal for MTBs, gravel, and touring bikes. Bicycle Rear Derailleur with Direct Mount for Mountain Bike Road Bikes