I have done a few searchs and found that people say their door jam stickers say 35psi all around. I have a 2004 roadster that came w/ 17 inch rims stock and my door jam says 32psi all around. Here is my delema I now have 18's and running 225 45 r18 and 245 45 r18 w/ OEM bridgestones, and I'm not sure if i should stick with what my stickers say (32) or go with 35.

Does everyones sticker say 35 psi on 18's?

thanks for your input,

John

 

On my Coupe with 18s the sticker says 35 psi.

 

I remember reading an article in Autoweek, I think, that mentioned the Roadster had a better ride than the coupe. They said the only difference between the 2 was recommended tire pressures, but they didn't say what that pressure was. I guess its 32 vice 35

 

So are we suppose to run the recommended PSI no matter what profile we run? For example 17 inch rim is 50 profile, 18 is 45 and 19 is 35 in all 3 cases would you run the same psi even though the profile is different?

 

The Yokohama rep came to a z club meeting a few years back, and he said run what the factory recommends, even though you have different size wheels. I think it was a legal thing, because I had gone from balloon sized 235/70-15s to 275/40-17s on my s-blazer, and that made no sense at all.

I like to run near the upper limit on the sidewall myself. Currently I run 40psi in all 3 cars we have, and the tires are placarded at 44max. Its a little rougher ride, but has better turn-in and less tire wear.

 

Guess I'll just run 32 all around unless anyone else has input on this?

btw thanks for the input thus far guys.

 

I was running 36 cold in the rear, and the tires were overinflated since the center of the tread wore prematurely.

 

not a WHOLE lot of difference between the 2... you really keep your tires within a 3PSI window?

I go up to 35-36 when I fill em; and let it drop till I get a warning that one hit 28. than back up...

 

Simple question; What does it say on the side wall? Max. inflation. A few thoughts to consider. The lower tire pressure makes the car ride better. Low pressure will wear the edges of the tires. On a low profile tire, there is not much deflection room in the event of a large hole in the road. When the tire hits the far side of the hole, the tire gets pinched and may cut the side wall and damage the wheel. Lots of $$$ in damage. I run my 18s at the max inflation 50psi. I'd rather do this than risk the damage. I also have 25 years experience selling tires and have seen alot of these incidents.

Good luck

 

Toyo told me I needed to increase the air pressure in my 245/35 and 275/35 19s to keep the same "load rating" as the stock 18s with the stock pressure.

They recommended a minimum of 34 in the front and 35 in the rear. I put them at 35 or 36 front and 37 rear.

 

When I went from 205/60s to 215/55s on my wife's Maxima, my installer recommended increasing the psi by 2 lbs. over manufacturer's recs. Seemed to work fine, still a good ride with normal tire wear.

 

That's great and all, but I have 12 months of driving on the OEM tires at 36-37psi in the rear, and my tires wore prematurely in the center such that I failed inspection. Why? They were over-inflated. I can guarantee you that DC roads are worse that Oregon roads, and my wheels ended up fine. You're clearly overinflating your tires. Needless to say from your post, I would never buy tires from you.

 

Don't the stock tires say 51 psi max on them? I'm having a hard time understanding why nissan is recommending 32/35 psi in a Z rated tire. I've never seen a Z rated tire with a lower max psi than 44, so the whole deal has me confused. I asked my uncle, who is head of new product product safety testing at Goodyear, what he thought about it. He said to go ahead and run the tires at the manufacturers specs just in case their was some reason for it, but that it seemed very strange for them to recommend such a low pressure for these tires. Not to mention that what ceraaa42 says is true, it can damage your tires to run them so underinflated. Can anyone offer an explanation?

 

I thought the stock tires were like 42psi max. cant verify that now cause I dont have them. but even if its 50; you fill to 50; when their hot your going to be way over 50.

yes you protect your rim. but if you hit a bump; that pressure has to go somewhere; and it may blow out the tire.

35cold assumes about 39-40 for most driving time. thats a fair amount of pressure with some room to expand in a pinch.