CYSKY 10 Speed Cassette 11 42T MTB Fit for Mountain Bike, Road Bicycle, MTB, BMX

10 Speed Wide Ratio Cassette Cogs 11-42T: 11-13-15-17-21-24-28-32-36-42T Perfect replacement suitable for road bikes, mountain bikes. Compatible with many brands system Cog Material: Nickel-plated, Carrier Material: High Tensile Steel About the shifting performance, we designed our tooth profile dedicatedly and use a narrow-wide tooth design to avoid the chain drop when back-pedaling. Close ratio gearing allows a more efficient use of energy through finer cadence control,easy to install without rear derailluer modification