ZTTO MTB Bicycle Single Speed Derailleur Bicycle Chain Tensioner For hanger dropout frame Adjustable Bike Pulley jockey wheel

ZTTO MTB Bicycle Single Speed Derailleur Bicycle Chain Tensioner

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

Upgrade: the NEW version adds a chain guide. more stable now