Older fork mounts only fit standard quick release bikes. This adapter from Rocky Mounts allows you to carry your thru-axle fork on your current rack. DriveShaft is a 12/15mm/20mm (including BOOST 110) thru axle adapter that can handle all three sizes of thru-axles and the only one on the market to lock. It fits standard fork mounts from RockyMounts, Yakima® & Thule®. It's wide mouth opening creates easy loading, holds tight with adjustable cam lever, includes snap in nylon shims to prevent the axle from being unscrewed, and gives the ability to switch from 12mm to 15mm to 20mm thru axles, just like that. Comes with RockyMounts locks and keys.