Originally Posted by Nixhex

I’m looking at buying a used set of carbon wheels, and because of the price tubulars are seeming like an attractive option (and the weight is substantially less).

But I’m noticing that most of the carbon tubulars I’m seeing are like 19-21 mm wide. Why so narrow? And stop me if I’m wrong, but your aerodynamics are kinda wrecked if you go putting a 25mm tire on a 20mm wheel, right?