description:

Made of aluminum alloy, durable, practical and anti-rust

Designed to provide a simple and effective method to tension a single adjustable speed system

Convert any multi-speed bike on each rack to single speed

Suitable for 13-23T gear chain mountain bike; easy to install and easy to use

Conventional pulley floating device can be rotated to achieve perfect chain tension

specific:

Material: aluminum alloy

Length: 90 mm/3.5 inches