This is the Axiom Streamliner Disc DLX Rear Rack. Designed to fit on disc brake frames, this frame is a versatile solution. Features: Lightweight, low profile solution for mountain, commuting and fitness bikes. Hand-welded 10.2mm tubular 6061-T6 alloy construction. Ultra-narrow profile improves aerodynamics. keeps loads closer to center and greatly reduces bag "swing". Designed for use on bikes without threaded eyelets. Ample space for MTB and Hybrid/Trekking fenders. Fits 26" up to 700c wheels.