Attach your bike trailer kit easily when using the Thule(R) Maxle 12mm Thru Axle Adapter. This Thru Axel adapter fits bikes with 12mm Maxle Lite and Trek ABP rear axles. Cruise around town with your child and enjoy the ride. FEATURES: Thru Axel adapter Designed to be used with attaching bike trailer kits Fits bikes with 12mm Maxle Lite and Trek ABP rear axles