Sanpete

I looked at a nice 98 LS today, and was treated to much information from the owner about the maintenance and so on, all sounded great. And he had stamps in his owner's manual to back most of it. But he told me one especially odd thing. He said he had 45 psi in his tires--these are V-rated Michelins, same size as stock but looking a little wider. This is in SoCal, out in the desert where it gets pretty hot. Is that even possible? If there's really 45 psi in them, the ride was surprisingly good, though there was surprising tire noise over one patch of freeway. The tire wear pattern and general shape of the tire looked more like 35 psi to me (a bit high), but he was clear it was 45.

CK6Speed

iTrader: (1)

He could have 45 PSI in them. Not saying that is really recomended, but if the wear pattern on the tires look okay it probably is fine for his style of driving. Many tires today have a Maximum PSI rating of 45 to 50 PSI. Not saying you supposed to fill them up to the maximum rating, but if the higher pressure in the tires work with this driving preferance than no big deal. You could always just lower the pressure in the tires if you buy the car from him. The bursting rating of a tire is somewhere around 200 PSI, so rest assured his high tire pressure will not cause the tire to blow out or anything.

PureDrifter

iTrader: (10)

a lot of people i know set their PSI high in order to squeeze some better mileage out of the car, i do it only on long roadtrips

i run my General Exclaim UHP's at ~38psi daily and 40-42 on roadtrips.

MC Wong

I live in Australia and the weather can get quite hot in summer. So I have been running 40psi on my RX and never had any problems. When I pumped the tyres to the recommended ratings in the manual (30psi) the ride was a bit soft. I also found that tyre wear seemed to be better on 40psi.

steveski

45 PSI sounds high - I run 35 PSI in mine and I am in Houston. If the tires look fine and ride quality is not compromised I guess it is fine - strange though to have that much air though.

Sanpete

200 psi burst rating? Wow. Well, no danger except to the ride, I suppose. I'm used to much cheaper tires. I think my last set had a max pressure rating of 35, 27 recommended for the car. I overfilled them to 30 and felt adventurous.

CptnTonus

I run 40psi in my tires and I actually like the ride quality better there than I do at 35psi. My tires are wearing evenly, and the maximum pressure is 44psi, so I'm not too concerned about it. I think I've got some Toyo Spectrums on there or something, 550 treadwear, yeah baby!

CK6Speed

iTrader: (1)

I've heard anywhere from 100 to 200 PSI and in between. On extremely hot days the tire pressure may raise as high as 10-15 PSI, so even at the maximum of 50 PSI of some tires, that would only be about 65 PSI. Well within blow out range. The bottom line is you can't burst a tire by over inflating it unless you are seriously trying to do so. Also, if you are filling up the tire to that high a pressure and the tire does blow, it will kill you.

skperformance

iTrader: (6)

I run 50psi in my 20's but for the size change that is what is recommended by toyo and their calculator. Ok they say 45psi but i like it stiff.

Harky

I run 42 psi in my stock sized Kumho tires...no problem.
I live in Phoenix where summer road temps can reach 140 - 150F. The higher pressure reduces sidewall flex and temperature build-up in the tire casing. A lot of folks in this area suffer tire failure from overheating and tread separation or blow-out.

GRAND_LS 4

iTrader: (2)

I used to run about 34PSI on the LS.

19psi

45psi is a bit high for a stock tire on an LS but it would be ok. i always run higher pressures on my tires to hellp protect the wheel from impacts but i'm running small profiles...

RA40

iTrader: (6)

When mine had stock wheels and tires I usually ran 34-35 psi. One service trip at the dealer, they topped liquids...blah-blah. I didn't think check the tire pressure since I didn't think they would touch that. The next day or so, I took a corner aggressively and the back came loose and the car nearly came around on me.

Back at home, after it cooled, I checked. The pressure they had put into the rears came out to about 42 psi in the Michelin MX4V's. At that level, the contact patch is reduced so it was no wonder the back end came around on me and especially after heating up. I could only guess the pressure was probably about 50 psi in operation.

To high IMO.