Originally Posted by
Doge
Well they kind-of are. Even with the exact same casing by the same mfg - like Vittoria - in the same size. I have that - clincher and tubular and also Veloflex. The clincher has material and air between the brake tracks. The bead is fixed. On a corner more of the side tread is used. The tubular, all the air is on top/outside the rim. The tire rolls a bit on the rim. Less tread is needed on the sidewalls in the same turn. Then the tubular has more usable, compressible air in the same size as the clincher, so on significant bumps there is less casing distortion.
The above statments are utterly nonsensical. They are so far off track they're off the road and bumping along in the cow pasture.
The only advantages tubulars have is the tire stays on the rim securely after a puncture and about 100g of rim weight. Every other conceivable metric is a negative for them.