Tire pressure

I have a 2017 TRD SPORT revtek suspension, 3" lift in front and 2" in rear. Running 10.5" Worx wheels with duratrac LT 275/70 r18 class E tires. Is anyone running these tires and what road pressure have you been using? These have an 80 lbs max pressure.

 

Goodyear will tell you 50psi for an E rated tire for your truck to maintain tire load ratings.

You can call them directly and ask.

This is the tire pressure I run.

 

You have to do the chalk test to get the proper pressure. It is different for everyone.

 

Chalk tests are ok but have room for error since a chalk test will be different with an empty truck or a fully loaded truck.

Typically people fill their tires to the psi that maximizes their load capabilities.

You don't want to chalk test your curb weight you would want to chalk test against your GVWR which is hard to do unless of course you like inflating and deflating tires all the time based on load.

 

you think people are riding around on 55psi? come on bro. most people run in the 30s

 

I run 28psi on my E duratracs. When I run 32-40 I get no shoulder wear at all. It's also -10c here so it's better for traction.

I would advise anyone with LT tires to start at 40psi and work their way down based on wear.

E tires are overkill for any tacoma so we can't make them squat even when towing so we need lower pressures.

 

Exactly. I'm at 40 personally. Somewhat close to the oem kevlar load ratings but any higher and they ride like rocks. We rarely have more than 2 people and maybe a cooler full of groceries so why would we fill them to 50-55 to ride around at max load capacity all the time? If/when we need to load up, its 5 minutes with a compressor. Not a big deal.

 

Never said 55 psi and people running 30 psi are on P tires not LT. Big difference.

Because OEM is a P rated tire not LT and 90% of people driving their cars don't change psi for lod ratings.

I agree they are overkill but a common misconception is that you air them down. This is actually false as LT tires require more psi to maintain the load capacity as P tires are easier to inflate thus requiring less psi.

 

Because 90% of people driving their cars will never load to their max load rating and GVW

 

Because 30psi is normally enough to meet max load capacity. Just like our OEM P tires....

When people swap to LT it changes things.

People on TW think all tires are the same. They aren't.

 

I'm not sure what you're trying to get at. Why would people who have LT tires roll around at 50-55psi which are like rocks on our weight truck to keep GWV and max load all the time?

 

They aren't like rocks I run them at 50. It's because a P rated tire at 30 psi will have the same load rating as a LT tire at 50 psi. Going less is underloadong the tire. It's about load rating not comfort. If you want comfort buy a P rated street tire.

I ran my F-250 at 75 psi for comparison because of the different load requirements.

Your stock OEM tires are set at max load so why wouldn't you max load your LT tire? 5600 pounds doesn't change because your tire changed, only the psi req for the tire.

 

I know how load rating works relative to PSI. Thats why I said in my previous post I keep mine at 40 (near oem tire rating) and if/when I go up and necessitates maxing out my load capacity and GWV, I have a compressor and 5 minutes to spare to air them up. And yes they are like rocks, subjectively, and especially due to the extra ply sidewalls. Our trucks are relatively light compared to your F250 so of course 75psi may not even be that harsh on it...

 

I edited a comment in my previous post. 40 isn't bad many run closer to 45. Not everyone wants to air up. Myself included.

EDIT: Do you air down your car tires because you don't run at GVWR? Every car ever made has the tires set to meet the GVWR. So why would you air down LT tires on a Tacoma? (Off-roading excluded)

 

And I will repeat my previous statement saying 90% of people won't even load up to max so regardless of what rating tire you have, it would be more common to put them at a more comfortable PSI than go 50-55 to meet GVW all the time. It just so happens the p rated tires meet the max load at a comfortable PSI. Thus, people will be more prone to go that route even on a higher rated tire

 

It's because people don't know any better. I trust the tire manufacturer not internet anecdotes.

Putting 4 people in the truck or car almost hits the GVWR. Not worth the risk.

 

I think most people who load up and tow to that degree would know better. For us common folk who don't max out their trucks' loads, we have LT rated tires because lower rated tires are much less common in the sizes we run (or not at all).

 

You don't need to tow. I can't speak for everyone here but I have bumper and winch, skids, and sliders which adds 450lbs. Myself and my wife add another 350 lbs.

This puts my truck at about 300lbs below GVWR excluding all gear.

Weight adds up quick.

If your truck is bone stock and never carries more than the driver then 40-45 might be ok. I always swing to side of caution.

 

I already said theres no more than 2 people including the driver and a cooler full of groceries. And yes our truck is stock besides the obvious wheels/tires. 40psi is comfortable to us and its near enough to the oem rating already. Again, not a big deal - we have a compressor. And obviously the more weight the truck is, the less and less higher pressures will feel more harsh.

 

Awesome, run whatever you want. You won't see Ferrari question the PSI recommended by Perelli...