9 Speed Cassette for Mountain Bike, 11-42T Mountain Bicycle 9 Speed Cassette Flywheel Fit for MTB BMX Road Bicycle, Super Light

9 Speed Cassette Tooth Ratio:11-13-16-19-24-28-32-36T-42T. With CNC Rear Derailleur Hanger Extension. Cog Material: Nickel-plated, Carrier Material: High Tensile Steel.which makes a good balance between strength and weight. 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. 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