Topeak QR BeamRack RX Bicycle Rack (E Type) Used by both professional and amateur riders alike Made using high quality materials and components Tested to ensure quality and durability Bag-compatible with RX QuickTrack System Aluminum beam; fits 25.4 to 31.8 mm (shims Incl.) Aluminum Frame Bike Mounted Rack Dimensions: 18.1 by 4.5 by 8.1 inches (L x W x H) Weight Capacity: 15 pounds