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@Dick
As for Si cranks - you’d need a 137 / maybe get away with a 125mm MTB spindle which are designed for wider MTB bottom bracket shells (to ensure the arms cleared the stays as IIRC the Q-Factor on SI/SISL arms is pretty narrow) and could risk the bearing / spindle contact points misaligning; I was also going to try this with some SISL arms but I suspect that the chainline and Q-Factor will be way off even if the bearing/spindle contacts arent....