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  1. DPR crank with O ring flywheel.

    I have an 82 mm crank from DPR. I have a gene berg flywheel that uses the o ring. Do I need to have my crank machined for the o ring or can I make it work without doing so. I notice on a crank that for the o ring there is a slight chamfer on it and was curious if this would affect the seal, end...