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Yes you can, AND you can run 120psi in a 25mm tire on a MTB rim rated at 55psi. (Although 80psi will improve the ride :)
Simba-
you can run 120psi in a 25mm tire on a MTB rim rated at 55psi
This is generally true, because of this:
Hoop stress from the tyre carcase isn't the only load which the rim has to tolerate, but it tends to be the limiting one with properly designed rims. Obviously with Stan's rims, all bets are off :-)
gbj_tester
That's a pressure chart for different tyres, not for a specific rim. You can't even mount a 50mm+ tyre on an A319.