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Old 01-13-2019, 11:37 PM #16
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I can’t imagine ever running at 40+ PSI. Is that wise?
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Old 01-14-2019, 01:51 AM #17
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Can't be horrible at 41.. Maybe once the snow melts, I can try a temp test..
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Old 01-17-2019, 12:57 AM #18
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Quote:
Originally Posted by Jim_A View Post
If your doing most driving on pavement your tires will wear in the center much faster! You don't go by the tires inflation rating, you go by what the vehicle manufacturer recommends, that is if you want even tire wear.
right. You don't run the tire's max... Look on your door jamb sticker. If you have non stock size tires and/or LT tires, etc. then I think you can research with the manufacturer for the recommended psi based on the GVWR. Running max psi will wear them out faster...
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Old 01-17-2019, 01:24 AM #19
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Originally Posted by ElZilcho View Post
Tire manufacturers only specify maximum inflation pressure.

[...]

Sorry if this is all a bit dry, but... science!
GREAT post! Spot on. I have been using an IR thermometer for years to monitor both vehicle and trailer tires. My fiberglass trailer is only 1000lb loaded so I go through tires too fast for wearing the center even at 30-35 psi as per the trailer's manufacturer recommendation. I fear overheating if I go lower, especially here in the Southwest's summers.

The fun is when the temp is HIGH LOW LOW on your vehicle's tires (not the 4R in my case)....

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Originally Posted by LarsBars View Post
Correct me if I'm wrong, but I'm not aware of tire manufacturers providing a recommended inflation, there's too much variance between vehicles for a one-size-fits-all recommendation. [...]
You are right, of course they don't. But you can email them and get yours.

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Originally Posted by BlackCloud View Post
I don't care what a vehicle mfr says to do with tires. They didn't manufacture or test that tire. The tire company did. Remember all those Ford Explorers flipping over? Ford was telling people to way under inflate the tires for a more comfortable ride. The tire is the only part of your vehicle that touches the road, so I do what they say.
I really hope you get what they say by talking to them or emailing them because that's about the only way...and it does work.

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Originally Posted by Bluesky 07 View Post
I can’t imagine ever running at 40+ PSI. Is that wise?
You cannot but you must if you are running LT tires and want to maintain the load rating. When moving from P to LT, email the tire company and they will let you know the appropriate pressure. I bet you won't like the ride if the midsize SUV is empty, but anything less cuts from the tires' load rating.

D and E tires put on midsize SUVs seem alright at much lower than recommended pressures because their starting load rating is way above the required one for the 4Runner or Wrangler, but a tire company will only recommend the direct equivalent PSI.

Even in the case of the LT-C Nitto Ridge Grapplers, Nitto told me 44 psi over email. This is not why I went with the Wildpeaks, but it was a factor. One less thing to think about.

Basically, if you are running LT on a loaded vehicle that is towing, you may want to definitely know what the recommended pressure by the tire company is, which is...not found on the sidewall....
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Old 01-17-2019, 03:21 PM #20
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I used to work for a driving school that was owned by Ford. We got some of the first Focuses to hit North America back in the early 2000s. Whoever did the post delivery inspection on them cranked the tire pressures up to the tire max of 44 psi, completely ignoring the B pillar sticker pressure of 32. The cars were unsafe. They bounced and steered like they were on beach balls. No traction running just on the centers of the tires. Deflated them to 32 psi and they handled excellently. Didn't go beyond about 12,000 miles without breaking something, but at least they rode well. I always recommend starting with the vehicle manufacturer's pressures and going from there.

Google "tire pressure chalk test". It's one way you can check for even wear.
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