This PRO brand chain strainer is the perfect accessory for cyclists travelling with their bikes enabling them to remove the rear wheel without any concerns that the rear derailleur might get knocked out of skew. Compatible with 12mm through-axles to create a temporary "dummy axle" that keeps the chain under strain. Compatible with all Origine disc-brake bikes only. Not compatible with rim braking models. +Can be used for transporting as well as cleaning the bike +Prevents the chain from slapping into the chainstay and chipping the paintwork +For easier chain cleaning.