"E" rated tires?

I don't really feel the need for a tire that tough on a Tacoma, but that is what I got a deal on, so they are on the truck. I've had P265/75/16 Cooper AT/3's on there for almost 57,000 miles. They still had some tread, but are getting slick on wet pavement and the ride and noise have gotten progressively worse the last 10,000 miles.

I have a BIL that had a line on a set of LT265/75/16 Pirelli Scorpion ATR's at a great price. They were still cheaper than another set of P rated Coopers even after the $70 rebate they are offering now.

I had them mounted this morning, ran some errands around town and have about 50 miles on them so far. They left the shop with 55 psi in them. I dropped it to 45 psi for now and over the next few days will experiment with different psi to see what works best. They are rated for 80 psi with a max load.

I'm looking for advice from those who run "E" rated tires as to what psi seems to work best for you.

 

Drop them to 30-35 PSI and try the chalk test.

 

Run them at the factory recommended pressure. Higher max psi doesn't mean higher recommended psi, and besides, if you pumped your tires to 80 psi there's a strong chance your rim would fail. For reference, I have 265/75/16 e rated bff ko2's and run them at 33psi front and 30psi rear unless I'm carrying a heavy load, then I up my rear to 35psi.

 

I run e rated michelins and keep about 30 in the fronts and about 28 in the backs. If you run more than 35 or 40 you will more than likely have problems with cupping as the tires wear (the inside tread of the tire wearing down faster than the outsides due to over inflation). I recommend doing the chalk test to figure out your ideal psi

 

I ran 255 e rated and 40psi seemed to be the sweet spot for me on the chalk test when new.

 

I run mine at 40psi all around, good comfort I've found at that pressure. I drive 80% of the time without any weight in the bed/towing. I haven't had any adverse wear on the tires at all. The E class tire is overkill but when I actually have a load in the truck I don't need to worry.

 

Thanks. I was thinking 35-40 would probably be about right. Even at 45 the ride isn't as bad as I expected. It was a bit stiff on the ride home at 55.

 

I run mine at 45 all the way around

 

38psi fronts and 34psi rears or 36psi rears worked good for mine. Got about nearly 50k miles on my tires and they still got another 50k left in them in seems, plenty of tread left.

 

Mine are at 35 psi. Seem to wear well, decent mpgs.

 

Run mine at 32PSI. GY Duratracs 285/75/16.

 

I dropped the front to 36, rear at 34 and drove it to my grand daughters softball game earlier. It seems to be good, but will chalk the tires tomorrow and see how it looks.

 

I had mine (285/75-16 k02’s) at 80 psi for about 1/2 mile. That’s what the shop put them at upon installation and the ride was so miserable I pulled over and aired down to 50. I’ve experimented a little since then, for me in a 4wd AC that is rarely loaded the best balance between comfort and mpg has been 40 up front and 35 rear with SLIGHT cupping type wear on the rear. I did a Trail recently that is a pretty rocky/shitty mountain type trail at 20 psi and it was great. Would never run 20 on the street, keep it around 40 and you’ll be good

 

I run slightly higher than most here. 46 to 50 in the front and 44 to 54 in the back all depending on load. If I run in the thirties I notice the side wall seeming to stay on hard corners and a decrease in mpg's. That's all with 235 85r16 e rated tires. They wear evenly across the tread.

 

I run 40 on all 4 corners. Toyo m55 255/85/16. Amazing tires

 

38PSI

 

315s duratracs

 

I run around ~37 and minus a couple of lbs rear if I have time on Toyo R/T, LT35/12.5/17, Load Range: E.
They are wearing out evenly.

I had them at 45PSI to drive out to the desert and deflated to ~30 before I got on the trails. Saved some gas lol.

 

BFG 265/75-16 TA/K02 @ 40 PSI

 

As many have said something like the chalk test is one of the more certain ways to determine proper inflation.

You can calculate a starting point though. The tires are essentially part of the suspension of the truck and Toyota determines the PSI on the door sticker based on many factors - not just the rated load at a given PSI. The PSI on the door sticker is for the specific type of tire listed only and isn't necessarily appropriate for other size or type of tires. But you can use that door sticker PSI and the load curves for both the old and new tire size to come up with a very good starting point for the new tire size.

What "load rating" a tire has actually doesn't change the recommended inflation at all - it only sets the maximum allowed inflation. Since allowed load is dependent on inflation that means it can also handle a higher maximum load (when inflated at the maximum pressure). The tire pressure vs loading curves for a given size tire are actually identical for load C, D and E. The only difference is the D and E can be safely inflated to higher pressures allowing higher loads.

What is very different are the tire pressure vs loading curves for different size tires. Here "size" includes whether it is a P or LT tire. LT tires have very different loading curves than their equivalent P sizes and typically will run at a higher PSI. For example the TRD OR has P tires and the TRD Pro has LT tires of the same dimensions. Door sticker for the P is 29/32. Door sticker for the LT is 46/46. Pretty significant difference.

So anyway, long story short starting from the recommended PSI for the OR P tires, using that tire's loading curve and then finding the identical PSI for the same load on your new tire the best starting point for a LT265/75R16 is 38/40. Go up or down a bit from there based on ride quality and chalk test.

Or skip the math, just guess and chalk test. But for reference just remember for "close" sizes moving from P to LT usually means a pretty significant increase in pressure - low to mid 40s is a sensible starting point.