Chain Retainer, Mountain Chain Tensioner Anti Drop Chain Retention for System Black Riding

High Adaptability: The bikes chain retainer can be adapted to the frame with the tube, suitable for any with traditional chain (not compatible with elevated design). Fixed Chain: Bicycles chain guide retention chains limits chain chatter caused by swinging the trailing arm under hard bumps, preventing or greatly reducing the chance of losing a chain. Anti Break: The middle of this bikes chain tension fixer is made of elastic material, which is anti break, stable in performance and can be used with confidence. Easy to Install: Small and portable, bikes chain retainer no need to remove the chain, easy to use, no adverse effect on the shifting system. Nylon Material: This bikes chain tension idlers is made of premium nylon material, which is withstand to wear and tear and has a long service life.