ZTTO CNC MTB Flywheel 11 Speed Aluminum Alloy+Steel Bike Cassette Cycling Replacement Part - 11-36T •It is made of high tensile Steel+Aluminum Alloy and made by the technology of quench-temper hardening.so it has higher strength,durability and has extreme resistance to abrasion. The strong antioxidation makes it hard to rust to have a long service life •High precision teeth ensure close connection with bicycle hub for smooth rotation and easy maintenance •The hollow design reduces weight and makes your riding easier •Use it to directly replace your old or broken flywheel. A wonderful accessory for most mountain bikes. Easy to install •Specification: •Material: Steel+Aluminum Alloy •Compatibility: 11-speed road bike HG system •11-28T teeth ratio: 11-12-13-14-15-17-19-21-23-25-28T •11-32T teeth ratio: 11-12-13-15-17-19-21-23-25-28-32T •11-34T teeth ratio: 11-13-15-17-19-21-23-25-28-31-34T •11-36T teeth ratio: 11-13-15-17-19-21-23-25-28-32-36T •11-28T weight: 208g •11-32T weight: 216g •11-34T weight: 227g •11-36T weight: 235g Package included: •1 x Cassette Flywheel