You might give them a try first. If a rider is built like a mantis, they can ride the wide bars with their elbows in on their chest. But if you have more muscle/beef/fat on the body/frame, you can't do that. There is only so much room in that cube that surrounds the TT. Those quads, forearms, biceps, gut and lats start hitting each other. Narrow handlbars force the elbows out which provides some more room in the cube.