Tire Pressure for 285/75 Revos ?

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NMuzj100

NMuzj100

Joined
Sep 25, 2004
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Location
Gleneagle, CO
I am trying to determine the best pressure for my new tires and figure that with the new size/load range that the stock 32 psi isn't going to be the best.

My 1998 cruiser is basically stock so no extra load from an ARB or winch.
 
"...So, answering the question of what is the "correct" tire pressure is not that easy. There are several DIY tests that you can try:
1. The "Business Card Test": On a smooth, hard surface, try inserting a business card between the tire and the pavement. If it goes in less than about 3mm-1/8", the the tire may be under-inflated, if it goes in more than about 6mm-1/4", it may be overinflated.
2. The "Chalk Line Test": Draw a heavy chalk line across al the trear faces. drive slowly forward in a straight line for a few revolutions of the tire. Get out and observe the wear pattern of the chalk. If it has worn away evenly, then the inflation is correct. If either the edge or center of the line is worn first, then the tire is under or over inflated, respectively.
3. The "Water Puddle Test": Similar to test #2, but drive through a puddle of water in a straight line, then get out and observe the wet tire tracks and see if the wet imprint is even, especially as the track starts to dry out after a few revolutions.
4. Heat is the #1 enemy of high-speed tires. The flexing of the tire's sidewalls as the tire rolls under load is the source of the heat. Higher inflation pressures mean less flexing of the sidewall and therefore less heat. Another test for proper inflation pressure is to measure the tire pressure when cold then again after 15 minutes at highway speed. If the pressure rise due to the temperature rise is more than about 3 psi, then the tire may be under-inflated"

I've always used method number 2. Some good technicle information here:

http://www.4crawler.com/Diesel/Tires.shtml
 
What Calamari says is correct, now, for your tire size and vehicle, and assuming your tires are "D" rated truck tires, you can try 35 psi cold and see how it feels for you.
After several tests, that's what I'm using on my 98 with 285/75/16 BFG AT and I'm getting a comfortable ride and good tread wear.
 
Thinking about trying 32 psi

I found the Load and Inflation Tables for the tire buried on Bridgestone's commercial site and even at 35psi (as low as the table goes) the tire will support more than the rear Gross Axle Weight.

I think I'll try the 32 psi as recommended by the tire placard and see how it rides. I will also try the chalk line method to try and judge what my wear will look like.

Has anyone tried the Nitrogen tire service that some shops are using ? Is the tire pressure really more stable ? I have never had a tire fail before I have worn out the tred. I can see the value in drier air but that is not really a problem here in New Mexico. Obviously not a big advantage to those that are airing-up and airing-down all the time. The brochure I got about the service from Costco had a 80 on the front so it must be the best thing since sliced bread.
 
Do you have these 285's on stock 100's or are they lifted any? I like the looks of the Revo's and plan on getting them for my next set. Just wondering if they will be ok for a stock height LX 470 that has the lowering capability??

Thanks
 
nrea:
I have them in a stock 100, no rubbing or any other problem at all. In the lower setting of an LX470, I don't know for sure. I would think there should not be any problem but you better makie sure.
 
Mine are on a stock cruiser and there is plenty of clearance on the wheel wells. From what I have seen on the board the 305s rub on the shock support not the wheel wells so I don't think you will have a problem at the low setting on your LX.
 
Mine fill up the wheel well nicely, and I'm amazed at how tight you can turn. They have never rubbed, except on frozen snow and ice that builds up on the wheel flares.
 
NMuzj100 said:
Mine are on a stock cruiser and there is plenty of clearance on the wheel wells. From what I have seen on the board the 305s rub on the shock support not the wheel wells so I don't think you will have a problem at the low setting on your LX.
Click to expand...
Drexx have OME LTR with remote canister. I dont think it would rub with regular shock. Even a few people are using 315/75R16 which are even wider and taller and no rub with the shock.
 
Ditto 35psi on my 80. I assume a similar GV weight.

On a side note if anyone is worried about performance of these in rain, not to worry. Officially 16 inches in 15 days in LA. No performance issues at all.
 
I sent the following email to "The Tire Doctor on Bridgestone' Commmercial Truck Tire site www.TruckTires.com .
Dear Tire Doctor,
I recently purchased a set of Bridgestone LT285/75R16 Dueler A/T Revos as a replacement tire for my 1998 Toyota Landcruiser. What tire pressure should I run for maximum tire life?
The original tires were 275/70R16s with a C load range and the tire placard recommended them at 32psi front and rear. The GVWR is 6860LBS with a GAWR of 3595LBS in the front and 4300LBS in the rear.
This tire is becoming extremely popular for Landcrusier owners and I'll share your answer with others interested in the subject.

Thanks, Matthew​

This is the response I received...

Matthew,

I will answer your question, but I need to throw in a few cautions
first:

1. Many light truck vehicle manufacturers recommend the
replacement of only the same size tire as the original equipment tire. You should first begin by checking the Landcruiser owner's manual to be sure Toyota does not restrict replacement tires.

2. The information I am providing is really only good for Landcruisers that are the same model and came with the same OE tires as I mention below. Our policy is that the replacement tires must always carry the same load as the original equipment tires. To determine that, we need to know those OE tires. If they change, or the OE pressures change, new calculations are required.

So, with that said, if Toyota allows the LT285/75R16 tire on the Landcruiser, and if they fit (probably not a problem), you should increase the inflation pressure in the LT285/75R16 size to 38 psi to
carry the same load. My reference materials show the P275/70R16 size as OE. Therefore, I used this size for my calculations.

And be sure to check the inflation monthly. All tires will lose about 1-2 psi a month due to just normal leakage. And, again, it is the air
pressure that carries the load so if you lose air pressure, you are losing load carrying capacity. Overloaded/underinflated tires can fail.

Hope this helps,

Bill VandeWater
Consumer Products Manager, Sales Engineering
Bridgestone Firestone, Inc
535 Marriott Drive, 9th Floor
Nashville, TN 37214
(615) 937-3200​

I think I'll raise my pressure to 38psi.
 
Very interesting - thanks for sharing!
 
You better sell your tires and get some nice, small, mushy OEM ones just to be safe.
 
NMuzj100 said:
I think I'll try the 32 psi as recommended by the tire placard and see how it rides. I will also try the chalk line method to try and judge what my wear will look like.
Click to expand...

I think you will find that filling to 32 is too low. After much experimentation and the tread contact test thingy (done with a one inch wide black Kiwi shoe polish sponge bottle - so much more revealing than chalk and so much faster to spread on and set up) I decided to do 36 psi. The Revos seem to flex much more than the BFG's I have always had so a little more pressure for street seems somewhat better. BTW, for those that want to really dial it in, if you use the same sponge shoe polish bottle you can let the polish dry a few minutes and then drive over concrete doing corners and see how flat the tread stays there too. HTH
 
Hmmm... so I've read this thread over and over and I still can't determine what the best PSI would be for my BFG MT 33s. I've got a winch and an aluminum bull bar and I'm running 32psi. I think I need to go a little higher.
 
MacNeill:

I'd def. do a shoe polish/chalk test. It's the only way to get "personalized" results to work from. That being said I've been running my revo's between 32-35 since new and have had good wear and hauled plenty of weight. I have been aiming for 35 lately just because it still rides good and gives a little more capacity just in case. But again Revo's are not MT's so take that with a grain of salt. With MT's I would def. be all over checking pressures. It makes a helluva difference with the lifespan of MT's from what I hear on the Tacoma boards.

How are you liking the MT's so far? I'm considering a second set of tires for fun and it's either gonna be BFG MT's or swampers.
 
tabraha said:
MacNeill:

I'd def. do a shoe polish/chalk test. It's the only way to get "personalized" results to work from. That being said I've been running my revo's between 32-35 since new and have had good wear and hauled plenty of weight. I have been aiming for 35 lately just because it still rides good and gives a little more capacity just in case. But again Revo's are not MT's so take that with a grain of salt. With MT's I would def. be all over checking pressures. It makes a helluva difference with the lifespan of MT's from what I hear on the Tacoma boards.

How are you liking the MT's so far? I'm considering a second set of tires for fun and it's either gonna be BFG MT's or swampers.
Click to expand...

Thanks! I need to find space to do the "actual" tire test for sure. Living in the city limits my space of observation. My majority of "weight" has been a bunch of PT lumber, soil etc. from Home Depot.

I so-so like the MTs. In hindsight, I wish I had gone with ATs like I had on my old Xtra Cab Pickup. They've been great on the beach where I run them 8-10 psi for both traction and erosion purposes. I wasn't crazy about them in the snow this past winter though. They tend to be noisy on road, but they look kinda cool.
 
I have used BFG A/T 285/75R16's for a number of years and find that 34psi is about the best pressures to use on the Blacktop. I drive a 2005 Landcruiser GXL V8.

Over here in Oz, we are fairly fanatical about tyre pressures down here and the best way we find the optimum pressures is going by the 4psi rule.

You start off at a particular pressure when the tyres are cold, and then run the vehicle for about 20 minutes during day time weather, and then check your tyres.

If they have risen by 4 psi, you are spot on in respect to the load and speeds in which you drive, if they are lower or higher than the 4psi difference, you need to adjust your initial pressures accordingly.
 
I've gone up in 2psi increments locally over the past few weeks and am now up to 36. This seems to be the most comfortable psi I've experienced yet. Headed on a road trip to Martha's Vineyard this weekend, so I'll see how they are on the highway.
 
NMuzj100 said:
I think I'll raise my pressure to 38psi.
Click to expand...

How are the tires doing with 38psi?

PS empty your pm box!

Dean
 
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