A Few More Tire Questions

[Kent10]

My new 2011 Trail will be arriving May 13. I have decided to replace the stock tires with Bridgestone Dueler A/T Revo 2 LT Load E 265/70R17 because I will be doing some off roading.

Bridgestone Dueler A/T Revo 2

I am going to order 5 tires so I have a spare. I would like to do a 5 tire rotation but I will need to order a new wheel because from what I have read the spare does not use the same wheel. Is that correct? I called Toyota and a wheel will cost $470.09. Wow. Is there anywhere else to order the stock Trail wheel. I know forum members sometimes sell their wheels but usually 4 at a time.

When I get the new LT tires they will need more air pressure than the stock tires. I figured it out to be 45-46psi. I have never had a TPMS in a car. Can this be readjusted for the new tires or do I just forget about using the TPMS. Will it sound an alarm for pressure too high?

I have been looking at deflators and inflators and think I might get these.

Amazon.com: ARB E-Z Tire Deflator: Automotive

Amazon.com: VIAIR 400P-Automatic Function Portable Compressor: Automotive

I have read some recommendations on how much to air down on dirt, sand or rocks but I know every tire is different and the type of vehicle must matter too. How about for my LT Load E tires. They have a stiffer sidewall and some recommend because of that you should air down to even lower levels. What psi should I use for plain dirt roads (washboard) and what is the max speed at that setting. Sometimes roads change from poor to better and I want to be sure if I air down to say 20psi I don’t drive too fast when the road is better.

Thanks for any help, Kent

 

[iDRiVaT4R]

]The spare doesn't have a TPMS sensor and the computer inside the 4Runner is only setup to connect to 4 TPMS sensors, so if you do a 5 wheel rotation, that 5th wheel will be TPMS-less.

TPMS dash light will only light when your tires fall under 26psi. I'm only running 39PSI cold in my Load E tires so 45-46psi cold might be too much. Will amount to a very stiff ride on road.

I have the Staun Tire deflators and they work great off road. They do take some time to set them all up to the desired PSI but once thats done, airing down is quick and easy. Staun Tire Deflators, Automatically Deflate, Staun Valve, Automatic Tire Deflators, Preset Pressure, Reduce Tire Pressure

Amazon.com: VIAIR 400P-Automatic Function Portable Compressor: Automotive I have this same Air compressor and works great. I wanted 100% Duty cycle vs more air output so that after airing up 4 tires from 25psi to 40psi, it will keep on running for the next 4 tires.

I tend to run off road at 25PSI. There are times when I'll be on road for a couple miles while heading to the next trail and I'll drive up to 65 mph at 25PSI. I have driven driven home before, about 80 miles at 25 PSI in my Tacoma and the tires were fine. Not recommended, but do-able .

 

[Kent10]

]The spare doesn't have a TPMS sensor and the computer inside the 4Runner is only setup to connect to 4 TPMS sensors, so if you do a 5 wheel rotation, that 5th wheel will be TPMS-less.

TPMS dash light will only light when your tires fall under 26psi. I'm only running 39PSI cold in my Load E tires so 45-46psi cold might be too much. Will amount to a very stiff ride on road.

I have the Staun Tire deflators and they work great off road. They do take some time to set them all up to the desired PSI but once thats done, airing down is quick and easy. Staun Tire Deflators, Automatically Deflate, Staun Valve, Automatic Tire Deflators, Preset Pressure, Reduce Tire Pressure

Amazon.com: VIAIR 400P-Automatic Function Portable Compressor: Automotive I have this same Air compressor and works great. I wanted 100% Duty cycle vs more air output so that after airing up 4 tires from 25psi to 40psi, it will keep on running for the next 4 tires.

I tend to run off road at 25PSI. There are times when I'll be on road for a couple miles while heading to the next trail and I'll drive up to 65 mph at 25PSI. I have driven driven home before, about 80 miles at 25 PSI in my Tacoma and the tires were fine. Not recommended, but do-able .

Thanks so much Nathan.

So 39psi is not too low for a Trail edition? I used the information from this thread http://www.toyota-4runner.org/perfo...ers-more/40803-lt-vs-p-inflation-article.html to determine the psi for load e tires but I don't really know what I am doing. I just want to be sure I don't under inflate for high speed travel on the interstate.

I looked at the Staun and also the Oasis which looked pretty convenient since you can leave them in and drive off. The Staun look great and I think if you are always airing down to the same amount then as you say they are also very convenient once you set them up.

Thanks again. This is very helpful.

 

[JB.]

When I get the new LT tires they will need more air pressure than the stock tires. I figured it out to be 45-46psi. I have never had a TPMS in a car. Can this be readjusted for the new tires or do I just forget about using the TPMS.No easy adjustment. It won't work exactly as Toyota intended as it was designed for P-metric tires, but it's still nice to have. If the light goes on on the freeway you don't know if you've got 25lbs of pressure or 10lbs, so you're going to stop and check no matter what tire you have.

I have read some recommendations on how much to air down on dirt, sand or rocks but I know every tire is different and the type of vehicle must matter too. How about for my LT Load E tires. They have a stiffer sidewall and some recommend because of that you should air down to even lower levels.Don't overcomplicate it. Doesn't matter. What psi should I use for plain dirt roads (washboard) and what is the max speed at that setting. Sometimes roads change from poor to better and I want to be sure if I air down to say 20psi I don’t drive too fast when the road is better.Typically I like about 18lbs. If you were going to maintain a speed over, say, 50mph for a while, a few more pounds wouldn't be a bad idea, so, like IDriva said, around 25lbs covers everything.

So 39psi is not too low for a Trail edition? I used the information from this thread LT vs P inflation article to determine the psi for load e tires but I don't really know what I am doing. I just want to be sure I don't under inflate for high speed travel on the interstate. The only crisp, clear answer is to follow load/inflation tables to the letter, but if you do that, it makes it look like you could run around at 25lbs of pressure in an LT no problem. There has to be a reference point. The standard reference point is the amount of load reserve designed for the OEM tire/vehicle match. When you reference the load capacity of a 265/70/17 P-metric tire at 32lbs and then match it with an LT of the same size, you end up around 44lbs. Did you see the chart in that thread? When I wrote that post, I had just learned and verified the information about LT pressure but was resisting the idea that I needed to pump up to 44lbs, so I created a different reference point that I felt was logical and I was comfortable with. Thus, the idea behind the chart. That's why I'm comfortable at 38psi especially in an LT that's at the upper end of highway suitability.


I have been looking at deflators and inflators.
I looked at the Staun and also the Oasis which looked pretty convenient since you can leave them in and drive off. The Staun look great and I think if you are always airing down to the same amount then as you say they are also very convenient once you set them up. Forget the Oasis unless you can get them markedly cheaper. You could leave the Staun's on, too. The only difference is Staun has the sense not to say you can.

....

 

[JB.]

So 39psi is not too low for a Trail edition?

Btw, IDriva has LT285/70/17, so his 39psi is about the equivalent of your planned 45psi in LT265/70/17.

 

[Kent10]

Btw, IDriva has LT285/70/17, so his 39psi is about the equivalent of your planned 45psi in LT265/70/17.

That makes sense. Thanks JB.

 

[Kent10]

Originally Posted by Kent10 View Post

When I get the new LT tires they will need more air pressure than the stock tires. I figured it out to be 45-46psi. I have never had a TPMS in a car. Can this be readjusted for the new tires or do I just forget about using the TPMS.No easy adjustment. It won't work exactly as Toyota intended as it was designed for P-metric tires, but it's still nice to have. If the light goes on on the freeway you don't know if you've got 25lbs of pressure or 10lbs, so you're going to stop and check no matter what tire you have. Makes sense.

I have read some recommendations on how much to air down on dirt, sand or rocks but I know every tire is different and the type of vehicle must matter too. How about for my LT Load E tires. They have a stiffer sidewall and some recommend because of that you should air down to even lower levels.Don't overcomplicate it. Doesn't matter. What psi should I use for plain dirt roads (washboard) and what is the max speed at that setting. Sometimes roads change from poor to better and I want to be sure if I air down to say 20psi I don’t drive too fast when the road is better.Typically I like about 18lbs. If you were going to maintain a speed over, say, 50mph for a while, a few more pounds wouldn't be a bad idea, so, like IDriva said, around 25lbs covers everything. Again makes sense. From my reading there were so many different ideas. I guess it comes with experience too. I just want to be sure I am not unsafe.

So 39psi is not too low for a Trail edition? I used the information from this thread LT vs P inflation article to determine the psi for load e tires but I don't really know what I am doing. I just want to be sure I don't under inflate for high speed travel on the interstate. The only crisp, clear answer is to follow load/inflation tables to the letter, but if you do that, it makes it look like you could run around at 25lbs of pressure in an LT no problem. There has to be a reference point. The typical reference point is the amount of load reserve designed for the OEM tire/vehicle match. When you reference the load capacity of a 265/70/17 P-metric tire at 32lbs and then match it with an LT of the same size, you end up around 44lbs. Did you see the chart in that thread? When I wrote that post, I had just learned and verified the information about LT pressure but was resisting the idea that I needed to pump up to 44lbs, so I created a different reference point that I felt was logical and I was comfortable with. Thus, the idea behind the chart. That's why I'm comfortable at 38psi especially in an LT that's at the upper end of highway suitability. The chart I used was the link in comment #1 and then I followed the instructions in #17.

P tire 2535lbs at 32psi / 1.1 = 2305lbs ; so with LT tires 2255lbs at 45psi on the chart or about 46lbs for 2305lbs
I will take a look at your chart more closely too.


I have been looking at deflators and inflators.
I looked at the Staun and also the Oasis which looked pretty convenient since you can leave them in and drive off. The Staun look great and I think if you are always airing down to the same amount then as you say they are also very convenient once you set them up. Forget the Oasis unless you can get them markedly cheaper. You could leave the Staun's on, too. The only difference is Staun has the sense not to say you can.Yea originally I liked the Oasis but then thought leaving them on would be somewhat inconvenient because then I have to remember to take them off and then stop to take them off and also keep it under 20MPH. As always, thanks for all your help JB

 

[iDRiVaT4R]

The Staun deflators are pretty quick at airing down your tires. We always just stop for a bathroom break or a drink break and I screw these on, wait a few minutes and take them off. By that time everyone is ready to continue on. Besides the Air compressor these things are one of the handiest gadgets to have on the trail.

 

[Kent10]

The Staun deflators are pretty quick at airing down your tires. We always just stop for a bathroom break or a drink break and I screw these on, wait a few minutes and take them off. By that time everyone is ready to continue on. Besides the Air compressor these things are one of the handiest gadgets to have on the trail.

Thanks. Here is one site I was looking at that compares a few Tire Deflator Comparison: Everything you wanted to know about airing down and more!!

The Currie is basically the same as the ARB but some say the Currie is not made as well.

 

[JB.]

I will take a look at your chart more closely too.

You don't need to unless you're interested in the thinking behind it. The easy rule of thumb is to just add 10-15lbs of pressure to same size LTs and call it a day.

 

[iDRiVaT4R]

Correction to my above post. I have the 450P Viar Compressor not the 400P. I went with the 450P because it has a 100% Duty Cycle vs 33% Duty Cycle. When I go off road I also fill up 2-3 other rigs tires, so I need a constant duty reliable Air compressor that would not quit.

 

[harper7]

Thanks. Here is one site I was looking at that compares a few Tire Deflator Comparison: Everything you wanted to know about airing down and more!!

The Currie is basically the same as the ARB but some say the Currie is not made as well.

I have the ARB E-Z deflator and it's super fast and easy to use. 40psi to 20 psi in less then a minute.It basically backs out the valve stem core.

I'm pretty sure they are made by Currie or the company that makes them for them too. They look and work identical.

 

[Kent10]

Correction to my above post. I have the 450P Viar Compressor not the 400P. I went with the 450P because it has a 100% Duty Cycle vs 33% Duty Cycle. When I go off road I also fill up 2-3 other rigs tires, so I need a constant duty reliable Air compressor that would not quit.

Thanks for the clarification. I did wonder about that. I think the 400P is fine for me. I was deciding between the 400P and the 400P auto and thought $200 why not spend $50 more. I'm not sure yet exactly how the automatic works but those who have it seem to like it. I guess you don't have to keep turning off the machine between tires.

 

[iDRiVaT4R]

The Pump has a little air chamber. When you stop airing up a tire, the pump fills the chamber to I think 145psi max. If you start to air up another tire before the chamber hits the max psi then the machine will not turn off and keep running. If your done airing up tires or the chamber hits max psi before you get to the next tire, the machine will turn off. Then as soon as you open up the valve to fill another tire, the chamber will lose some psi and turn the machine back on.

It basically has an internal cut off switch set to 145 psi.

 

[Kent10]

The Pump has a little air chamber. When you stop airing up a tire, the pump fills the chamber to I think 145psi max. If you start to air up another tire before the chamber hits the max psi then the machine will not turn off and keep running. If your done airing up tires or the chamber hits max psi before you get to the next tire, the machine will turn off. Then as soon as you open up the valve to fill another tire, the chamber will lose some psi and turn the machine back on.

It basically has an internal cut off switch set to 145 psi.

Neat. I think Viair has it wrong on their website for the 450. It says rest after 40 minutes. VIAIR Corporation - 450P-Automatic Part No. 45043