A technically advanced design allows the race face 318mm evolve stem to handle serious all mountain riding at a very competitive race ready weight 160 grams 100 mm the evolve is a high performance stem at a reasonable price forged blasted 6061 aluminium for high strength fatigue resistance at a reasonable weight four bolt bar clamp holds bar securely in position interlocking u shaped handlebar clamp geometry faceplate eliminates stress risers which could cause your bar to be