25
The age old tire pressure question
(lemmy.world)
2001 Infiniti QX4
Placard on car says 26 psi cold
Tires say 32-49
Rear tire is set to 27 cold
Does this look under-inflated? What’s the lowest I should go?
The placard on the driver's door frame is what you use.
The tire itself has no relevant information for a driver, only for an installer at a shop mounting the tire.
*as long as the tire is the same size as suggested by the manufacture
Even if you have a different size than is OE. You only disregard the psi, that is based on gross vehicle weight, if you know what you are doing.
It doesn't matter if you have 265/70r16 and go to a 275/50r20, you still use the same pressure because your car still has the same GVWR.
Thanks. What does the installer use the info for?
Practically, nothing. The pressure on the sidewalk is what the manufacturer says will seat the tire on rim, but reality dictates you add pressure until the tire pops into place. That may be 40psi, but I have had to use over 100psi to get a tire to pop in place if that is what it needed and the tire lube wasn't enough and you correct to manufacturers' spec once the beat seats.
Interesting. Thanks!