Non Jeep Tire Pressure confusement

[Ahoragi]

I'm getting confused on this topic cuz it related to two different vehicles. I own a 99 4runner, 99 TJ, and recently sold a 01 XJ.

I'm used to using 26-28 psi in my jeeps which is about perfect for the larger than stock tires like 31's and 33's. I been reading up on the 4runner and what folks run on them and they are saying 40's, 45, and some even run 50's. The 4runner is about 600-700 lbs heavier but it still does not make sense to run 40 psi in the tires. One particular person contacted BFG and asked what pressure he should be running with their 265/75/16 and they recommended no lower than 38 psi.

My tires are Kumho AT51's with max load of 2600 at 51 psi. What's funny is I am trying them at 30 psi and it feels as if they are flat spotting like swampers if left sitting for more than a day or two.

Here's an example of what I come across in my searches for tire pressure:

http://www.toyota-4runner.org/5th-gen-t4rs/93245-what-tire-pressure-best.html

Any input on this?

 

[Chris]

Subscribed... I too am confused on this one.

 

[Northwood]

I ran 32ish psi in the 32 inch BFG A/T's on my third gen 4runner. I had/have excessive wear at the center of the tread, indicating they were overinflated. Nothing insane, but very noticeable once the tires got close to the end of their life. No idea what the proper number would be, for my E's 32psi is definitely too high. Being just a hair heavier than the tj's I imagine adding a couple psi to the amount suggested around here would be fine.

You would think it would be easier to find definitive info on this sort of thing... a simple chart would be great from the tire manufacturers. X-amount of weight, Y-tire and size, Z-PSI.

 

[egclassic]

My 2001 Toyota Tundra door label shows 26 psi front and rear on the two stock tire sizes.
I always ran at 35, but recently lowered them to the 26 psi on the label to see how it rides. But I think this summer, I may have to increase it when I pull my boat.

 

[glwood]

I'm getting confused on this topic cuz it related to two different vehicles. I own a 99 4runner, 99 TJ, and recently sold a 01 XJ.

Here's an example of what I come across in my searches for tire pressure:

http://www.toyota-4runner.org/5th-gen-t4rs/93245-what-tire-pressure-best.html

Any input on this?

My input is, after reading that thread, I can see why you're confused.

 

[Ahoragi]

I tried 32psi right after they were mounted and it was rough

My 2001 Toyota Tundra door label shows 26 psi front and rear on the two stock tire sizes.
I always ran at 35, but recently lowered them to the 26 psi on the label to see how it rides. But I think this summer, I may have to increase it when I pull my boat.

Tire size?

 

[Ahoragi]

My input is, after reading that thread, I can see why you're confused.

But that's not the only thread. I been researching this since I mounted my tires and most of them are similar......

 

[bobthetj03]

I generally follow the vehicle's recommendation that is on the door jamb and fine tune it depending on your use. If I'm towing a trailer, add a little. I run 26psi on my Jeep, 30psi on my Rodeo, and 32psi on my Nissan Z.

 

[Chris]

My input is, after reading that thread, I can see why you're confused.

No kidding... They're all over the place with recommendations.

 

[glwood]

But that's not the only thread. I been researching this since I mounted my tires and most of them are similar......

The Tacoma forum I belong to has a place to get info on 4Runners. I put out a feeler to see what anyone with a 99 has to recommend for tire pressure.

 

[Ahoragi]

The Tacoma forum I belong to has a place to get info on 4Runners. I put out a feeler to see what anyone with a 99 has to recommend for tire pressure.

Cool, thanks. Lemme know what they say.

 

[Ahoragi]

I have nitto ridge grapplers C load 285/70/17. 50psi on sidewall marking. Had them at install at 40front 40 rear. Did 10K service and dealer set at 50front 35rear. Rides fine not much front dip as stock Duellers. also not as much rear bounce as before.

 

[Chris]

Whaaaaaa!? 50 psi front and 35 psi rear? Where the fuck is that oddball pressure coming from?

And how is that riding better than 40 front and rear?

You've got me generally confused.

 

[UpperMI]

My Toyota highlander is 32-35 psi. That's it. I can't imagine that a 4runner is all that much different.

 

[Chris]

My Toyota highlander is 32-35 psi. That's it. I can't imagine that a 4runner is all that much different.

I would imagine that is true as well.

50 psi? Are these guy nuts?

 

[StG58]

Just throwing this into the mix. 3/4 ton Suburban, 255/85R16 MT tires. Load range E. 32 front, 32 rear.

 

[Ahoragi]

Whaaaaaa!? 50 psi front and 35 psi rear? Where the fuck is that oddball pressure coming from?

And how is that riding better than 40 front and rear?

You've got me generally confused.

Tell me about it. I read through many threads on the 4runner.org site and they are all goofy with tire pressure.

One person stated that a LT tire needs 12 more psi to handle the same weight as a passenger tire. So if I have 32 psi on stock passenger tires then I need 44 psi with a LT type tire? I dunno if there's any truth behind that.

 

[Chris]

Tell me about it. I read through many threads on the 4runner.org site and they are all goofy with tire pressure.

One person stated that a LT tire needs 12 more psi to handle the same weight as a passenger tire. So if I have 32 psi on stock passenger tires then I need 44 psi with a LT type tire? I dunno if there's any truth behind that.

Have you been experimenting with different tire pressures to see what works? It should be obvious when they're running too much psi.

 

[Chris]

Just throwing this into the mix. 3/4 ton Suburban, 255/85R16 MT tires. Load range E. 32 front, 32 rear.

Exactly. If your big heavy Suburban is running 32 psi all around, a 4Runner should be running a similar number.

 

[Ahoragi]

Tell me about it. I read through many threads on the 4runner.org site and they are all goofy with tire pressure.

Have you been experimenting with different tire pressures to see what works? It should be obvious when they're running too much psi.

Yeah I tried the usual Jeep pressure (28) and it's a comfortable psi but a sluggish on acceleration. I tried the crazy 45 psi and I ended up upside down in my seat. Right now I'm running 32 which is a bit rough around town but nice on the highway.