Because you love your bikes, when you're not riding them you're washing them, tuning them, or traveling to exquisite ride destinations. The Thru-Axle Chain Keeper is an ideal solution for keeping your bike chain secure during bike washing, tune-ups, and traveling. This elegant, lightweight, bio-based plastic design fits perfectly on the axles of 12mm thru-axle dropout systems, no tools required. By keeping chain tension with the Thru-Axle Chain Keeper, you can be confident your bike is safe during drivetrain cleaning or travel. Features: - Protects rear derailleur by maintaining chain tension when the rear wheel is removed. - Ideal bike service tool for washing, tune-ups, and traveling. - Accommodates road bikes, cyclocross bikes, mountain bikes, electric bikes, fitness bikes, and more. - 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. - CNC machined aluminum body is corrosion-resistant and comfortable in-hand. - Tool-free, easy-install design makes use simple and effective for beginner or professional bike mechanics. - SAG Sustainability Action Group approved - bio-based material, low packaging volume, and mono-material for easy recycling.