Originally Posted by
BCAC
The bike is an Argon 18 Disc Di2 with carbon wheels and the original 25’s needed 125 psi. The bike isn’t designed for comfort, but my 67year body was fine with it. It really is much more comfortable with the 28’s at 80. I ride longer because I’m less tired and I think I might be a bit faster,
With all due respect, you don't "need" 125 psi unless you're a whale.
It might say 125 on the tire sidewall, but that refers to the pressure it might blow off the rim. In other words, the maximum allowable pressure. Not the recommended riding pressure.
If you weigh 350 lbs, including your bike/gear/clothes, Silca's respected calculator says to ride 98 front/100 rear psi. They don't offer calculations over 350 lbs
I ride 85/89 on my Conti 25's w/latex tubes. I weigh 145. Bike 18. Plus 12 for gear/clothes/shoes
https://silca.cc/pages/sppc-form?sub...6-619a2df01982