 Some off @-@ road models featured two designs of one @-@ piece welded stem @-@ bar combination , marketed as " Mission Control " ( MC ) , that eliminated clamping bolts and excess material . The original version , <unk> , used a quill stem and required a 1 inch ( 25 mm ) threaded steerer . MC2 used a <unk> tightening against a collet that sat between the fork steerer and the stem , and a special eight pointed wrench was required to remove it . The steerer had to be cut to the correct length in order to adjust the height of the stem . <unk> was a third version that was only the stem , thus the handlebar was not welded . 
