ZTTO 1142 Mountain Bike 11-42T Flywheel 11 Speed Bicycle Cassette Replacement Part - Black / Silver

• Made of high tensile steel and made by the technology of quench-temper hardening, so it has higher strength, longer 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. Easy to install

Specification:

• Material: steel
• Teeth ratio: 11-13-15-17-19-21-24-28-32-36-42T