Thule 821 Low Rider Bike Carrier Create your own carrying solutions with these fork mount blocks. Can be mounted to virtually any flat surface (hardware not included) Fits standard 100mm QR-compatible forks with 9mm quick-releases. (Adaptors available for thru-axle forks: Thule part number 53015 for 15mm axles, 53020 for 20mm axles) Fork mount skewer holds fork in place for stable and secure bicycle transport One mount carries 1 bike Heavy-duty steel construction - simple and strong | Thule 821 Low Rider Bike Carrier Bed Rider Van/Truck Bed Bike Rack