It may boil down to the Mash Factor - Single speed fellows can slow on hills requiring them to really mash the pedals to keep moving - This is not a bad thing but having a 280# plus guy on a bike and then torquing it down on a mash could really put some strain on a frame...
Hey... Could that be another bumper sticker?... "Strain Your Frame"
Last edited by zandoval; 06-17-13 at 11:32 AM.