Note: All OneUp Components 50T and 45T expander sprockets kits already include our 18T sprocket.
The OneUp 18T sprocket and spacer kit replaces the 17T and 19T sprockets within a stock 11 speed Shimano cassette and spaces the cassette out by 4mm which greatly reduces back-pedal chain dropping issues. The 18T kit removes one gear from your cassette without changing the stock range and is only compatible with 11-speed components. Simply use your low limit to remove one click from your rear shifter.
Sprocket material: Chrome plated hardened steel
Sprocket weight: 24g (18T),
Compatibility: For XT/XTR M8000/M9000 11-40T, XT/SLX M8000/M7000 11-42 cassettes. Also compatible with the OneUp 10T cluster.