Dmr 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.
seat Clamp Size: