I have Toyo Proxes FZ4 225/40. What is the proper tire load for the Summer and Winter time, not that I will be having these on during Winter. I heard some peepz say 4psi below what the tire reads, what's the deal?

 

The correct tire pressure for any vehicle is what the CAR manufacturer states, not what the tire says. For my '95 GLE, its 29 PSI front and rear. Look for a sticker in/on your car to find out what it is supposed to be.

 

i never knew that. so what are the numbers on the tires for? for instance mine says 44PSI, does it not mean anything? and i have a 97' GXE, would mine be 29PSI?

 

Those are the MAXIMUM tire pressures to safely have in the tire, accounting for warm tires and full load of passengers. The sticker is on the door jamb, on the cover of the center console or in the glove compartment. It also has the recommended tire size on there too.

 

I've been thinking of getting some 17" rims to replace the stock 16" rims on my 97 SE.

The tires will have a lower profile or aspect ratio - whatever, the distance between the outside edge of the tire and the outside edge of the wheel will be less with a larger wheel [assuming one is trying to match the overall tire size].

So, even if my wheel is larger and the tire will be different,
I should still follow the Nissan reccomendation for PSI?

 

Ah, this gets to be a little more difficult to answer. The simplest answer is no, you have to increase the tire pressure for the speed/load rating to stay the same. Visit your local Nissan dealer or ask in the 5th Gen forum about what the recommended tire pressures are for the 5th gen 17"SE wheels. I have 17" wheels, and have them at 34 PSI, but thats ballpark.

 

When I got my 17" rims from tirerack, I asked them what I should inflate them to. I asked whether the 15" stockers 29/29 is good enough, or should I go higher. The Tirerack guys (two of them) said 38 front, 34 rear. And that's what I run. The ride is a little rough, but the tire wear has been excellent, perfectly even all the way around.

 

Hmmmm, my 18inch Toyo Proxes FZ4 says 50psi, so there is no way I am going to underinflate my tires to my 15inch tires of 32psi, hahahahaha. I guess we people really are inconclusive in this effort. I am just going by what the tires says. Although the rear is 45 and the front are 48 psi.

 

I think you should go by what the tire manufacturer states. Extensive testing has been done by the manufacturer on the tire and they know what the proper inflation level is for maximum performance.

Nissan Motor Co. is not all knowing in this regard. They can only give general guidlines to fit a broad spectrum of tires.

 

I think the car co. wants you to have a soft ride, so the numbers are a bit on the low-side. I think 34 front/ 31 rear COLD is pretty good, and you really should do it cold. An easy way to accomplish it is to overinflate at the pump, and in the morning use your gauge and lower the pressure to 34/31 or 35/32.