Topeak beam rack mtx v 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 featuresintegral bungee cordsafety reflectorredlite mounttail light mountbag compatibility mtx seriesaluminium beammax weight 9kgs20lbssize one size fits all seatposts shims includede type for standard size frames a type for small framesweight 680gbuy topeak a