• The flywheel is made of high-quality materials, has good wear resistance and fatigue resistance, and can maintain stable transmission performance during high-intensity riding
• The flywheel is made of lightweight materials, making the entire bicycle lighter and more comfortable
• The flywheel is suitable for a variety of terrains and riding scenarios, whether it's urban commuting or outdoor adventures

Specification:

• Speed: 12 speed
• Teeth ratio: 11-13-15-18-21-24-28-32-36-40-46-52T
• Weight: about 741g
• Material: steel, aluminum