Topeak beam rack mtx a typefor mtb or heavy commuting use improved qr mechanism is more secure and easier to use compatible with all mtx trunk bags 20lbs carrying capacity includes two rubber bungees and safety reflector features added features rubber bungee safety reflector redlite mount and tail light mount bag compatibility mtx series clamp qr fits 25431 8mm shims incl material aluminium beam max weight capacity 9kgs20lbs size l x w x h 54 x 127 x 81cm 21 3 x 5 x