Topeak Explorer Bicycle Rack with Disc Brake Mounts and Spring Used by both professional and amateur riders alike Made using high quality materials and components Tested to ensure quality and durability Bike rack fits all mountain bike frames with disc brakes Braze-On type attachments MTX QuickTrack system compatible Made of strong and lightweight hollow 6061 T-6 aluminum 13.6 by 9.3 by 16.1 inches (L x W x H); Weight capacity is 55 pounds