Originally Posted by
Billydog
I let the bike shop put air in my new tires..
On the box is says 120 max psi..
The bike shop guy asks me how much I weigh and only put in 90 psi..
Wh did he do that?
Because he knows better than you perhaps?
But more constructively, the max pressure on the sidewall is very likely NOT what you want to be running.
Plug your details into the pressure calculator -
https://silca.cc/en-au/pages/sppc-form