21T Single Speed Cassette Set MTB Sprocket Freewheel Mountain Bike Component Black

Description:

This bike cassette cog made of 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 7-10 speed Cassette flywheel. Please choose 7-10 chain to install.

: 21T. Suitable for long-term outdoor riding.

Lightweight won't add more burdens to your bike and scientific design increases area to protect hub body.

Specification:

Material: Aluminum Alloy

Size: 21T

Package Includes:

5 Pieces Gaskets

1 Piece Flywheel Cover

1 Piece Flywheel