I HAVE privat 19" WHEELS
MY TIRE specs are

245/35/19
275/35/19

its cold here in new york, what should i keep my tire pressure at in the winter and in the summer

im running at 40 psi in my tires now, regular air not nitro

 

Keep it at what Infiniti recommends, probably around 35PSI when cold. Ask someone with stock 19s and see what the recommended psi is, and follow that.

 

but this is not stock 19s the sidewall is smaller

 

shouldn't it say on the tire, or with the tires what the appropriate psi is? That's what I have found in the past at least. 35 psi is standard for road going, and 40 is pretty much standard for auto-X and track events.

 

^ Yes please follow the manufacter's psi recommendation located on the sidewall.

 

it usually only displays the max pressure. just use the automobiles recommendation. the psi is usually in accordance with the amount of load the tire takes under that spot of the car. just use the numbers listed inside your door on the car.

 

i run 40psi on my low profiles b/c the tires absorb the bump so it doesn't bend the rim as much. just watchout for potholes b/c you should anyways

 

run 38. why? cause everyone else is guessing.

 

The best way to determine what pressure is right is to do the chalk test, or do the same thing with some water instead of chalk.

The tire pressure recommendations on your door only apply to OEM tires. If you get something with a stiffer or softer sidewall or more ply's on the tire, the best pressure to run is likely to be different than what the OEM specs on your door jamb sticker say.