LANXUANR 9 Speed Mountain Bicycle Cassette Fit for MTB Bike, Road Bicycle?Super Light Description ?Note?A variety of specifications are available for your choice, please carefully check the specifications you need before purchasing. Choose the one that suits you best.(Includes 25T to 50T, 8 specifications) ?Best Choice?Bike flywheel is made of quality steel material,high temperature resistance,corrosion resistance, anti-rust, non-deformation, wear-resistant,high performance of durability,good impact performance,high-precision tooth shape,loss- tooth design, strong compatibility,make riding increase more possible ?Feature?Provide fast and accurate index conversion function through special tooth profile and ramp, it delivers smooth gear steps across its 9 speed range,Accurate positioning ?Easy to Install?Professional manufacturing, directly replace your old or broken freewheel.Wonderful accessory for mountain bike and Road cycling.Easy installation, no need to make any adjustments to the transmission ?Compatibility? Sram and Shimano 9 Speed System.Recommended Use: Road cycling? 25T and 28T?, Mountain biking?32T-36T-40T-42T-46T-50T),LanXuanr commit for great affortable bicycle parts to improve your performance and experience Product Tags Road, Mountain