Quote:
Originally posted by cappi
Okay, the answer to the original question posed is.....
*26psi in the front
*29psi in the back
This is for a 4x4(TRD), V8 with 265/70/16's on it. It's in your owners manual. I've kept mine pretty much like this on the OEM BFG's and it's been okay. I'm noticing with 20K now that the edges wore a bit faster that the centers with this pressure setup.
You guys that are cranking them up to 35 psi(cold I would assume), you do realize that working temp takes them up to 38-40psi at least? A little over the limit of 35... I don't know if that's bad or not. Remember, tires that start with a P designation are technically passenger tires, which usually(not always) have a 35 psi max. If your hauling a bit with your truck then when it's time replace, use LT(light truck) tires which will have higher load ratings.
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Keeping the tires at 26 psi for the front is within Toyota's recommendation, but it is a bit low. You will likely get more than usual edge wear in the TRD oem tires and pretty mushy handling. BUT you will get the softest ride possible. Certainly the most comfortable ride pressure when going straight ahead. But you'll probably end up replacing your tires early. When you bring your vehicle in for service, they'll probably put 32 psi in all the tires (even though that's not in the manual).
What is dangerous about keeping them at this pressure (26) is not the 26 psi. It's the fact that if you don't check the pressure for a couple of months that it may drop to 20 psi and that's dangerous. That's exactly what was\is happening with the Ford Explorers - plus driving fast on hot roads. Those tires are fine a proper pressure. You really don't want a tread separation problem on your front tire! But the Tundra, with it's somewhat dead handling, would likely be one of the best vehicles to have it happen on (being more of a non-event).
If you pump them up to higher pressure, you have a margin of safety. If you're in doubt about your load on the tires it's ALWAYS better to overinflate than underinflate. Within reason of course. Too, if you are going to drive 70 mph regularly, you absolutely should inflate your tires a couple psi above what would be considered "normal". The tires will actually run cooler and last longer.
That max pressure is measured cold so if you put in 35 psi, but it gets to 40 psi hot, that's taken into account (provided you keep within the speed rating of the tire). There is a safety factor built in. If you underinflate though, what happens is that the tread plies are so overworked and the tire heats up so much that the tire pressure increases to a higher pressure but even more, the steel plies get pretty darn hot. Maybe to the point of damage.
26 psi is the very bottom of range of pressure that you should put in your tires. And if you are going to run that, you'll have to check your tires more regularly to make sure you aren't beneath that pressure (which is a safety issue).
Alan