how big is oversized? are you talking 31.0 clamp size? i used a diatech brake lever on a bike i built up for a friend. the bars have a 25.8 or 26.0 clamp size and the lever fit just fine with no modifications. there was a shim inside of the hinge and i'm sure if you removed that it could fit 31.0. the hinged levers are nice so you don't have to take the tape off the bar to remove it...