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fussballclub
They do, my Grand Bois Hetres is 38mm at first, but after a couple of week it finally stretch to 42mm.
Even Corsa SC 25mm come up to a staggering 29mm at 100psi (guy on here run it that high).
GP 4000sii is inconsistent, a 25mm set on 13mm internal width is 26mm, on customer's bike with 13mm internal too; 28mm.