YHUS Aluminum Alloy Cycling Rear Derailleur Chain Tensioner, Single Speed Adjuster, Folding Bike Chain Stabilizer & Guide

• Material: Made of aluminum alloy material, light weight does not put an extra burden on the bicycle.
• Spring Design: This chain adjuster can change multi-speed bikes into single speed bike.
• For 11T/13T Derailleur: Ensures perfect tension for your chain to make you pedal with less efforts.
• Universal: It can fit various sizes of gear, and prevent chain from skidding out from the crank.
• Usage: MTB, road racing, fixie bikes, single speed bikes, bmx's, freestyl-e bikes.

Features: Material: Made of aluminum alloy material, light weight does not put an extra burden on the bicycle. Spring Design: This chain adjuster can change multi-speed bikes into single speed bike. For 11T/13T Derailleur: Ensures perfect tension for your chain to make you pedal with less efforts. Universal: It can fit various sizes of gear, and prevent chain from skidding out from the crank. Usage: MTB, road racing, fixie bikes, single speed bikes, bmx's, freestyl-e bikes. Specifications: Material: aluminum alloy Color: black Size:about 90x50mm Package included: 1pc x bike chain tensioner Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.