Feedback Sports Thru-Axle Chain Keeper Description: The Feedback Thru-Axle Chain Keeper is an ideal solution for keeping your bike chain secure during bike washing, tune-ups and traveling. The lightweight, bio-based plastic design fits perfectly on 12mm thru-axle dropouts. By keeping the chain tensioned, you can be confident your bike is safe during drivetrain cleaning or travel. Fits 12mm Thru-Axle dropouts Prevents the chain from slapping against delicate and painted frame surfaces High-density, solvent resistant, Bio-based PA56 roller is easy on your chain, yet incredibly durable SAG (Sustainability Action Group) approved - bio-based material, low packaging volume, and mono-material for easy recycling Simple tool-free installation