Feedback Sports Chain Keeper. Because you love your bikes when youre not riding them youre washing them tuning them or traveling to the ultimate ride destination. The Chain Keeper is the perfect solution to keeping your bike chain secure for bike washing tune-ups and traveling. The elegant CNC machined design fits standard quick-release or 12mm thru-axle dropout systems no tools required. By keeping chain tension with the Chain Keeper you can be confident your bike is safe during drivetrain cleaning or travel.