• 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.
• ANTI SKIDDING DESIGN: Spring design can fit various sizes of gear, and prevent chain from skidding out from the crank.
• COMPATIBLE: Suitable for folding bike with 11T or 13T rear derailleur.
• EASY TO USE: Lightweight and , easy to install and use. Nice accessory for cycling lovers.
• GUARANTEE: If you are not satisfied with our product received, you can apply for unconditional return and refund within 180 days. In terms of any problem of this product, you can send emails to us at any time. We will reply you as soon.