Decades ago cyclocross cranks had 2 toothless rings on either side of the 1 chainring.. to keep the chain from coming off on rough race course layouts..
you could unhook the cable , turn the stroke limit screws to center the FD over that 1 centered chainring, and be good to go.. but aesthetics are paramount ..
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Last edited by fietsbob; 03-18-18 at 01:42 PM.