Aluminum Alloy Upgraded 13T Single Speed Flywheel for Bikes

Description: This bike cassette cog made of high quality aluminium alloy material with anti-rust plating- high strength, strong and solid for long time using. The set includes 5 pieces spacer, flywheel cover, and 1 piece flywheel for convenient using. This flywheel is compatible with 7-10 speed Cassette flywheel. Please choose 7-10 chain to install. Teeth: 19T. Lightweight won't add more burdens to your bike and scientific design increases contact area to protect hub body. Specification: Material: Aluminum Alloy Size: 13T Package Includes: 1 Set Cassette Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!