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Ritchey road stems boast a special angular steer tube cut recommended for carbon fiber and light alloy steer tubes. The Pro level stem features a 4 bolt bar clamp that wraps 180 degrees around the bar to reduce bar stress. Includes sizing sleeve for 1 inch steer tubes. 31.8mm clamp. +- 6 degree rise 145g Specify Extension 90, 100, 110, 120, 130