Smooth speed change: The vacuum plating technology makes the surface of this mountain bike cassette flywheel fine and smooth. It is equipped with a precise gear design, which is lighter, smooth and stable during riding, and accelerates quickly, and it can effectively prevent the chain from falling off. Gear ratio: It can meet the replacement of most mountain bike cassette flywheel 12-speed High-quality materials: The mountain bike flywheel made of high-pressure steel is durable, wear-resistant and not easily damaged, and has a long service life. It is an ideal replacement for variable-speed flywheels. Compatibility: Compatible with most mountain bike cassette flywheels, such as SHIMANO and S-R-A-M's 12-speed 11-46T flywheel. It is recommended to use SHIMANO's 12-speed M7100, M8100, XTR M9100 S-R-A-M kit 12-speed SX, NX, GX, XX1 Easy to install: Easy to install, no need to adjust the gearbox, directly replace the old or damaged flywheel, it is an excellent accessory for mountain bikes and variable speed bikes The mountain bike 12 Speed cassette made of high pressure steel is durable, nickel and chrome plating. With hollow design, weight reduction, super wear-resistant steel. Which is lighter, smooth and stable while driving and accelerates quickly, and it can effectively prevent the chain from falling off. COMPATIBILITYCompatible with most mountain bike cassette flywheels, such as SHIMANO and S-R-A-M It is recommended to use SHIMANO 12-speed M7100, M8100, XTR M9100 S-R-A-M Kit 12-way SX, NX, GX, XX1 It can meet the replacement of most of the mountain bike cassette flywheel 12 speed The gear ratio is 11-13-15-17-19-21-24-28-32-36-40-46T 11-13-15-17-19-21-24-28-32-36-42-50T 11-13-15-17-19-21-24-28-32-36-42-50T 11-13-15-17-19-21-24-28-32-36-42-52T Color: As pictured Precision manufacturing Mountain bike cassette flywheel fine and smooth. It is equipped with a precise gear design Easy to install Easy to install, no need to adjust the gearbox, directly replace the old or damaged flywheel It is an excellent accessory for mountain bikes and variable speed bikes Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.