It's 45mm or so wide and stout. Amsterdam stout. Throw out the scale stout. Guffaw at goatheads stout. Nearly 900g, and there's hardly a way to do that without adding stoutness. It fits into our 650B frames, but no room for a fender. Still, a good way to go and probably the best way to go for a stout commuter or a bunkarumptuous trail ride.