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Old 10-22-2014, 06:22 PM   #1
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Towing and tire pressure

Hi everyone,

I'm towing an ST270BH with my Tundra 5.7l.
Up until now I've just left the tire pressure on all four tires consistent at around 30psi, this is what they set them at when I get it serviced at Toyota.
But I'm wondering, should I increase the tire pressure in the rear tires when towing? If so, by how much?
The sidewall on the tire says the pressure shouldn't exceed 50psi.

Lastly, my Tundra, has a 'low tire pressure' indicator light. When it gets cold out the light goes on. I had assumed the light was coming on because the temp was dropping outside. As I said, all four tires are at 30psi.
What do you all think?
Thanks,
mike
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Old 10-22-2014, 06:48 PM   #2
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If you are getting sway or a wishy washy feeling when towing, then I think you should raise the tire pressure.
You might be pleasantly surprised how much better your towing experience will be.
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Old 10-22-2014, 06:52 PM   #3
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Your door sticker should state what the rear axle weight capacity (GAWR) is and what PSI is required for that capacity. If you are anywhere near the rear GAWR, then tires should be at that PSI. If the tires are a higher capacity than what was originally on the truck, and also higher PSI rating, then inflate the rear tires to whatever PSI you prefer as long as it is higher than the door sticker and not higher than the tire rating. But generally, you will get less sway with stiffer rear tires and less rolling resistance.

It is normal for lower temps to cause lower tire pressures. But while that may be OK for normal driving, for towing you should add air so that when cold, the tire PSIs are at the numbers indicated on the door sticker. You should not begin towing with tire pressures low enough to trigger the tire monitor.
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Old 10-22-2014, 06:59 PM   #4
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Quote:
Originally Posted by Lloyd View Post
If you are getting sway or a wishy washy feeling when towing, then I think you should raise the tire pressure.
You might be pleasantly surprised how much better your towing experience will be.
When towing , put air pressure at the max that is on the side of the tire. Stops the swaying..
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Old 10-22-2014, 07:31 PM   #5
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Thanks everyone. Excellent advice.
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Old 10-22-2014, 08:12 PM   #6
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I would add that running your tire pressure too low is a leading contributor to premature tire failure. I run my Load Range E Michelins at 75 to 80 psi when I'm towing. (Tire sidewall says "inflate to 80 psi cold.") Running lower than rated tire pressure, especially when towing, causes excessive heat buildup, which in turn could lead to tire failure.
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Old 10-22-2014, 08:47 PM   #7
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The sticker in my 2012 Crewmax with 275/65 18's specify 30psi on the front and 33 in the back.
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Old 10-23-2014, 05:04 AM   #8
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Get online and find your tire mfg's load inflation charts,
weigh your truck empty and hooked up/loaded,
and inflate the tires to the pressure needed to support that weight AT A MINIMUM ...

http://blog.tirerack.com/blog/docs-a...r-my-new-tires
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Old 10-23-2014, 09:18 AM   #9
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Tire pressure

Ok, so now I'm more confused.
The markings on my tire say they are Michelan 305 50R20
The sticker in my door says something for tires that are P255/70R18.
Nothing on the door stickers say anything about tire pressure while towing.
The 50 r20 tires came with the truck but they were an add-on I think. I didn't add them on, they were on the truck when I bought them.
I tried to find tire inflation pressure guides online for these tires but didn't have any luck.
Right now they are all at 32psi.
I was going to put the back tires at 40-45 psi for towing (max cold pressure on tire says 50psi)
I'm not sure if I should change the front tire pressure. What do you think? Just change the back or both front and back?
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Old 10-23-2014, 10:00 AM   #10
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I inflate all my tires to the same pressure. If you aren't towing, 35 psi would probably be fine for your tires. However, if I were you I would inflate to the higher end of that 50 psi when towing. (45 to 50 psi cold.) That is just my two cents.
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