Originally Posted by
datlas
Still over-inflated IMO even if his roads are smooth and he is a fattie. He would probably have a more comfy ride and same speed (or even higher) at 100 PSI. 120 should be saved for the velodrome.
On 25s for a heavy guy on a good road Silca suggests that about 100 is ideal for going fast. Pump manometer being off by 10 psi at 120 psi wouldn't be unheard of; mine is off by 7-8 psi at 100 psi - so 120 psi
on his pump could be fairly close to ideal. We don't know.
However, tubeless 25s on 72.5 psi (or if the pump is off, "somewhere under 70 psi") is definitely way below ideal for a guy of 200 lbs.
The corollary of that is that hookless wheels with 72.5 psi limit and tires below 28c just don't make sense as a combination and even those are borderline on good surfaces. I'm fortunate to have plenty of them.