Looking for the proper tire inflation pressure for Toyo Proxes 4 tires (235/45ZR17)on a 2004 TL.

Thanks.

 

Check the max cold pressure at max weight info on sidewall of the tire
Since you are not max weight load on tires-
Take 80 percent of the max pressure number
and use that as a starting point.

Example: max cold 44 - 20%= ~8-9 so 36 psi would be a good place to go from.
You can then check the pressures after a hot run or a pyrometer reading across the tire - adjusting to equalize the temps- is the best way to go

 

The door sticker and owner's manual have recommended pressures for the stock 17" wheels/tires- 35F/32R for manual tranny and 32F/32R for automatics oin '04, IIRC- as well as the 18" A-Spec options.
The recommended pressure is a good starting point. I like to run a little higher pressure and for less understeer on my stock 17" wheels, so I use 36F/33R or 37F/34R.
Measure the tire pressure cold; I wouldn't exceed 40 psi for daily use.

 

Its important to check the numbers on the tire sidewall
Different brands have different needs depending on sidewall construction

 

Hey guys quick Question,

Over the weekend in NYC i checked my tired 06 tl auto and they were fine in the cold setting 33f 32r. Now this weekend the city was hot so the pavement when driving warmed my tire so hot that when i check my tire while driving they were 39f and 38r. Should i be lowering my PSI cold setting or let it be? I was so afraid it might go over 40 cause i felt the difference while driving from 33 -39

 

There is a reason the tire only list COLD pressure- dont worry, pavement temp is not killing your tires. You should see what happens on a mountain fun run!
More heat from the brakes getting to the tires than the pavement!

Depending on what tires/size you run- some like a few more psi cold to improve handling and gas mileage
Example-door sticker says 32/32 run 36/35 and see if you like it.

 

If i remember correctly, the max pressure on the side of my tire said 55. I dont think you're in danger of hitting this if you fill it up to 35 while its cold, regardless of how hot it is outside.

 

01tl4tl, the correct tire pressure is not derived from the maximum pressure stamped on the tire's sidewall. The one and only correct tire pressure is on the sticker on your door jamb and your owner's manual.

If you are running the stock size, always run your tire pressure as the sticker or manual states.

This is an article on Tirerack, outlining that the "right" pressure is what the sticker on your door jamb or manual states, nothing else.

http://www.tirerack.com/tires/tirete...e.jsp?techid=8

"Therefore when checking and adjusting tire inflation pressures, the "right" inflation pressures are those provided by the vehicle manufacturer, not the "maximum" inflation pressure branded on the tire's sidewall. The vehicle manufacturer's pressure recommendation can be found on the vehicle's tire information placard label, as well as in the vehicle owner's manual."

 

....ummm yeah...cause if you fill it to the maximum it will likely blow?...and the reason I brought it up was because he was afraid 35 might be too high

 

That's all well and good if your running OE tires but what if you changed brands? Even if the tire size is the same, I "assume" the requirements might be different!

 

Brands don't really matter in this. As long as you're using factory size tires, you should use the factory recommendation.

If you look at the sticker on your door jamb, it doesn't specify the tire make and model, right?

 

My '05 came with 235/45/17 tires which I had replaced before delivery with Michelin Pilot Sport A/S. Again 235/45/17. Michelin agreed that the correct pressure is determined by the car mfr., rather than tire mfr., so keep my 35/32 settings. (6spd.,A-spec).
OE loads are 1,102 lbs/tire @35 psi front, rear is 1,058 lbs @ 32psi.

I upgraded at 48,000 miles to the same type of tire, only 245/40/17. I asked Michelin for recommended pressures. Their reply for this sized tire was 32/29.
1,135 lbs/tire @ 32 psi front, 1,080 lbs/tire @29 psi
My max. pressure on the sidewall is 51 psi. 80% of that would be 41 psi, which is too high.

'05 6MT NBP
A-spec suspension
K&N Typhoon intake
245/40/17 Michelin Pilot A/S's
Debadged rear
V1 on the lookout