Bike Single Speed Converter Aluminum Alloy Bicycle Chain Tensioner Bike Rear Derailleur Guide for Folding Bike

Features: 1. HIGH QUALITY: Made of premium aluminum alloy material, lightweight and easy to install. 2. FEASIBILITY: Suitable for folding bike with 11T or 13T rear derailleur. 3. PARTS DESIGN: Spring adjust, which provide perfect chain tension.  4. PARTS FUNCTION: Converts multi speed bike to a single speed.  5. GUARANTEE: If you are not satisfied with our product you received, you can send emails to us at any time. We will reply you instantly and help you solve your problem. Specification: Material: Aluminum Alloy  Color: Black & Red Fitment: suitable for folding bike with 11T or 13T rear derailleur Weight: approx. 63g Package List: 1 x Chain Adjuster