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: 21T. Suitable for long-term outdoor riding.
Lightweight won't add more burdens to your bike and scientific design increases contact area to protect hub body.

Specification:

Material: Aluminum Alloy
Size: 21T

Package Includes:

5 Pieces Gaskets
1 Piece Flywheel Cover
1 Piece Flywheel

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!