MTB Bicycle Single Speed Cassette Cog and Derailleur Bicycle Chain Tensioner Group Set

Bicycle Single Speed Cassette
16T/17T/18T/19T/20T/21T/22T/23T

Fit for 10/11 speed HG hub body
weight : about 90g(16T) ~ 120g(23T)

Bicycle Single Speed Derailleur

Converts any multi-speed bike to a single speed

Spring loaded design accommodates a wide range of cog sizes
Range: 13-23T

extremely lightweight.
Adjusts for perfect chain tension
Adjustable chain line

Weight:About 63g