• It is made of quality steel material, with nickel-chromium treatment, high temperature resistance, corrosion resistance, no deformation, providing long-term durability
• 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 road bikes. Easy to install

Specification:

• Teeth ratio: 11-12-13-14-15-17-19-21-23-25-28T
• Speed: 11 speed
• Material: steel