The Blackburn EX-1 DISC Bicycle Rack has a new mounting system that works with disc brake frames and bikes lacking rear dropout rack mounts. The lower mounting points attach to the included extra-long QR skewer. Built from welded over-sized aluminum tubing, the EX-1 Rack Fits most frames, is compatible with CoPilot child seats, and includes a Lifetime Warranty. | Blackburn Expedition 1 Disk Bike Rack