Compatible with Shimano & Sram system. WLKY is committed to creating great, affordable bicycle parts to improve your performance and experience Use of high-quality imported steel, high strength, high wear resistance, not easy to rust, easy to clean Professional manufacturing, directly replace your old or broken freewheel. No adjustments to the gearbox required Sprocket synchronisation. Improved switching precision, less load on the chain. Optimised tooth spacing for longer service life, less wear This cassette offers better equipment for climbing See more product details