VGEBY Bicycle Tensioner, Bike Speed Tensioner Aluminum Alloy Folding Bicycle Single Speed Chain Tensioner Rear Derailleur Guide Cycling Parts

Features: 1. PERFECT TENSION: This chain adjuster can change multi-speed bikes into single speed bike. Ensures perfect tension for your chain to make you pedal with less efforts. 2. ANTI SKIDDING DESIGN: Spring design can fit various sizes of gear, and prevent chain from skidding out from the crank. 3. COMPATIBLE: Suitable for folding bike with 11T or 13T rear derailleur. 4. EASY TO USE: Lightweight and mini, easy to install and use. Nice accessory for cycling lovers. 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