Winter tire pressure

I’m new to the Tacoma world and wondering what tire pressure folk are running with winter tires? I’ve got a 2020 DC TRD Sport with 265/65R17 Blizzak DMV2 tires. Door pillar sticker says 29 PSI but the dealer has put 36 psi (cold) in.

 

I run 30 PSI

 

I go with 30#, which is the sticker, winter or summer.

 

Dealers always over inflate
pay peanuts, get monkeys

 

Chalk test.

Tires shouldn't fluctuate more than 10% +/- from your chalk test and normal operating speed.

10 degree in temp change is about 1 psi

 

28.6983443 psi

 

32 psi - 365 days/year.

 

30 PSI at 30 degrees F. As previously stated, that translates to higher pressures at higher temps.

Therefore, in the summer months, I fill to about 35 PSI.

 

If those tires are the stock size and load rating, go with what the door says. If not, here:

 

The numbers on the door jamb are for best ride when unloaded. The number on the tire is for carrying heavy loads. It should be around 44 PSI with P rated tires although it will vary some depending on the exact tire and size. The more weight you have in the truck, or tongue weight from towing, the more air you need. If under inflated when carrying loads the tires overheat and could fail. Although this is more common in summer months.

I'm using E rated tires now and the the standard rules don't apply. When I had P series tires on my truck I ran somewhere around 35 PSI all the time. I carry loads fairly often and just keeping them on the high side of acceptable was a lot easier than going through the air up, then air down dance every time I needed to carry any weight or tow.

I didn't find the ride objectionable at 35 PSI and found I got 1-2 mpg advantage at that pressure vs 30 PSI.

It doesn't matter if it is summer or winter. 35 PSI is 35 PSI at 0 degrees and at 100 degrees. BUT.... if you air up to 35 PSI at 100 degrees, then cool the tire to 0 degrees and check the air pressure it will be a fair bit below 35 PSI. You'll need to add more air to get it back up to 35 PSI. And if you're at 35 PSI at 0 degrees and warm the tire up to 100 degrees it will be significantly over 35 PSI. You'll need to let some air out to keep the pressure at the correct setting.

 

This is incorrect. The number on the door jamb is based on GAWR and tire size and load rating. You should never run the maximum pressure on the tire, unless that is what the vehicle manufacturer recommends.

I do agree with your last paragraph.

 

Read the postings by Splitbolt at the link below, he knows what he is talking about

https://www.tacomaworld.com/threads/what-psi-should-i-run.51690/page-14#post-22185851

 

29 at freezing all day long.

 

NEVER blead air from a warm tyre.
Not because you could burn your fingers, but because the tire needs the higher pressure to give it lesser deflection so heatproduction, because cooling down is also worse then, because of the lesser temperature-differences between rubber and in- and out-side tyre air.
Goal is that the no part of tyre, reaches a critical temp, at wich it hardens and cracks are made, wich crack further in time.
In fact the tyre is lost then, but it can take years, before damage build up that much that it blows.

When cold, you dont need to highen up to advice pressure for safety, for road handling you may do it.

 

I just changed out the summer air and installed winter air.

I made sure the summer and winter air was mixed with 80% nitrogen. The 100% nitrogen isn't needed for a daily driver.

In the summer, I run 30 psi in all 5 tires. In the winter, I run 30 psi in all 5 tires.

@jadatis.......you have some really bad erroneous information about tire pressure.......

 

I generally try to run my truck tires in the 32-36 range. In the warmer months, they will hold the pressure fine, but in the winter months they will drop down into the 20's if you don't pay attention to them. I haven't checked them in a while and it got down to 9 degrees 2 nights ago so I bet they are down in the 20's now. Time to go out and check them and most likely add some pressure.

Edit: Yup, all 4 tires were at 26.5 lbs so I brought them back up to 33 for now. I don't drive much so my tires tend to lose more pressure in the cold. If you do a decent amount of driving, the heat from daily driving should keep them closer to spec.

 

I recently fitted Michelin Defender LT265/70/17 tires at Costco.
The guy insisted inflating it to 40psi
The ride was hard, bouncy and uncomfortable

After reading the "what psi should I run" thread I started adjusting the pressure downward.

Some guys recommend 34-35psi front and 30-32psi rear
I'm running 36 front and 33 rear, I might still go down some.
I tried 32psi all round but the front tires felt squishy and wiggly

It makes sense that the front tires need more pressure carrying the weight of the engine, front differential and most of the cab and transmission.

 

Where do the air leak out? Valves or at the rim

 

It doesn't leak out, the colder weather causes it to lose pressure. I remember in the late spring when it was getting warmer the truck felt more firm so I checked the tire pressure and it was up to 38 so I had to let some air back out.

 

Air will expand and contract with temperature. When the air is in a closed volume, like a tire, the pressure will increase and decrease with temperature as the air tries to expand or contract.

A tire will have tendency for slow leaks at the bead or valve stem.

JL8Jeff is correct. You must check your tire pressures every few weeks or at every fuel fill.

Don't rely on the TPMS to replace maintenance. The TPMS is a warning system for sudden loss of pressure before the rim makes contact with the pavement while running at speed.