thanx tazio, that's my bike. i wouldn't know how to post a pic here if my life depended on it (and it does), i'm stuck in the seventies, i'm afraid.
the problem is that the bb on it is so long (to accommodate extra wide swing arm), that when you try and fit a shimano drive crank or something else, the chain ring sticks out too far and is not aligned properly with all these chain retaining bits on the swing arm. so i need to find a 48t single ring crank that is totally flat on the inside and has no bolts and other bits sticking out (on the inside, the bits used to screw on inner rings) and hitting the swing arm when i try and push the crank/chain ring in to align it properly. i believe the coda single ring cranks and bb for this bike were custom made specially just for it and nothing else in the cannondale catalog. any suggestions, anyone ???
pls ask me questions if i haven't made it clear enough.