Btw, at 100psi, my 27c Open Pave, with Vittoria latex inner on Mavic A719 with 16mm Velox rim tape (maybe that makes a difference??), measures 27.2 on the front and 27.0mm on the rear.
Sound about right when first mounted, give it a couple weeks for the tyres to stretch and it'll be around 28-29mm max.
although 100psi is pretty high, unless you're pushing 100kg.
@edscoble started
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Btw, at 100psi, my 27c Open Pave, with Vittoria latex inner on Mavic A719 with 16mm Velox rim tape (maybe that makes a difference??), measures 27.2 on the front and 27.0mm on the rear.