Am stem 0deg 318mm all stems are cnc machined from a solid billet of 2014 t6 aluminium the am stem range has been redesigned with more material taken out to save weight and also features a new front plate design opposing steerer clamp bolts remain to give exceptionally rigid steering characteristics optimum machining to give lightest weight without compromising stiffness weight from 134g 318mm handlebar clamp diameter for 1 18th steerers