• 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