The Thule 53020 - Thru-Axle 20mm Adapter is a simple adapter to transport a bike equipped with a 20mm thru-axle on a standard fork mount bike carrier. The Thule 20mm Adapter installs easily on your 20mm fork before loading it onto your rack. Once installed on the fork, just lift your bike up onto the rack and the adapter fits into your rack with ample clearance for disc brakes and low hanging fork legs. Can be rotated over 180 degrees to provide for clearance with other bikes on the rack. The adapter is steel construction with a durable silver powder-coated finish.