• 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 mountain bikes. Easy to install

Specification:

• Teeth ratio: 11-13-15-18-21-24-28-32-36T
• Speed: 9 speed
• Material: steel
• Type: Super Fluid Drive positioning type