Designed for 700c bicycles. Adjustable height CrMo construction(also available in stainless steel) Mounts to hub axle Platform is 14.25"w x 12"d Lower horizontal strut can take a small bag or pannier ED black Optional fence available Extra eyelet for dynamo lamp or other gadget This updated version has attachment points for mini rack eyelets for added stability and safety (bikes do not have to have mini rack eyelets to use this rack)