Originally Posted by
Banzai
Most of the tires I see tested at the 25mm size actually plump up to 27-28mm, ESPECIALLY on the new wider rim standards that are in vogue. (My Michelin Pro4 Endurance tires plump up to just shy of 29mm on Pacenti Forza rims.) So does that mean that 28mm MEASURED is truly the sweet spot?
My 28mm GP5000TL's measure 28.8mm with maybe 0.2mm variation around depending on pattern etc. Same F/R, at 65/75 psi respectively. My rims measure 23.5mm, but that's on the outside (didn't check while mounting the tires, and those SOBs aren't coming off again anytime soon!). All measured using calipers, the tires carefully so as not to compress the rubber. They don't seem particularly plump or balloonish to me... Only slightly wider than the rims.