Dual Chain Reactor MK2 The dual pulley and a Sideplate to keep the chain on and the tension constant in both front gears. Stiff stainless steel construction and a seat tube clamp mean this device runs true and stays locked once you’ve adjusted the tension. The Dual Chain Reactor comes with ISCG, ISCG 05 or standard BB mounting patterns. • Sizes:28.6mm/31.8mm/34.9mm • Weight:157g
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