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Old 08-26-2019, 05:37 AM   #201
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Default Re: Tire Size 255/85/R16 for 4x4

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Originally Posted by Wrinkledpants View Post
Just to update this thread: we have about 22K miles on our tires and they're horribly cupped. Spoke with the dealer and they're saying they rotate tires front to rear unless we ask for cross rotation. Cooper tires is indicating that a simple front to rear rotation will result in cupped tires. We're buying new ones on Monday and going down to a 5K tire rotation schedule with a cross rotation. We'll use one of the better tires as a full-sized spare. I'm also going to try reversing the tread pattern on one side of the van to see if that eliminates the pulling.

After this setup, we'll go with a 17" wheel as the tire options are much better.
This mirrors my experience until I went up quite a bit in psi. I think the cupping is exacerbated by the weight of the van exerting is self on a tall, skinny tire at low pressure. At around 65 PSI up front the cupping stops and the wear pattern returns to normal.

Like you, Im considering jumping to 17s
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Old 08-26-2019, 09:35 PM   #202
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Default Re: Tire Size 255/85/R16 for 4x4

I have 12K on my StMaxx's. I did not rotate until just recently (I was going to earlier, but...) and my fronts were cupping pretty badly too.

Discount cross-rotates, and I will hit 5kmi rotations now to see if it helps. I was also running pretty low pressures, and have now upped that a good amount. The ride is fine with more psi with the Fox shocks, but I was trying to negate (the harshness) with lower pressures before. My build is pretty 'light' at <7500lbs fully loaded, and <7000lbs most of the time.

Previous pressures
F - 40-45psi
R - 35-40psi

Now
F - 50psi
R - 60psi (I may drop this is ~55psi as I don't need the load capacity)


I'm sticking with 16's as I like all the rubber (and I have other things to spend $ on )
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Old 08-27-2019, 03:13 AM   #203
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Default Re: Tire Size 255/85/R16 for 4x4

Bummer - we'll go with higher pressures as well.
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Old 08-27-2019, 03:23 AM   #204
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Default Tire Size 255/85/R16 for 4x4

I am running 42F/55R cold and 48/62 hot with maximum GVW. Discount Tire recently rotated front to rear after 10,000 miles. My local alignment shop had swapped the front tires at 5,000 in an effort to eliminate pull to right. No cupping so far on the Coopers.

I did stop by the local Off Road Warehouse to see what was available in 17 tires. The Falken Wildpeak seemed a logical choice in 255/80-17. 33 All Terrain tread but less aggressive compared to ST Max and likely quieter. The fact that they come with a 50k warranty is positive indicator. Possibly mount them on 17 Method MR701 rims after seeing a few forum pictures.


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Last edited by gltrimble; 08-27-2019 at 03:42 AM.
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Old 08-27-2019, 03:28 AM   #205
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Default Re: Tire Size 255/85/R16 for 4x4

I’m hesitant to post pressures since I’m still trying to figure this out but for reference
My van, when loaded to the max is 7780 lbs with 4020 on the rear axle
Most of the time, there several hundred lbs less in the rear.

Currently running 65 psi front and 55 psi rear
This seems to be working.
I seems that I can get away with less pressure in the rear with no ill effects
I recently tried 60 psi front and it was hard to tell if that was going to be OK

YMMV
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Old 08-27-2019, 03:40 AM   #206
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Default Re: Tire Size 255/85/R16 for 4x4

^^ Same result for rear pressures on mine. Running 35-40 in the back didn't affect wear on the rear tires - zero cupping and even wear.

I just set the front for gravel/rocks and never really adjusted, even though we were hwy warrior-ing the beast for many more miles.


Still love the StMaxx's though. I feel very confident off-road with these and their tough side walls and great traction. If they made a 255/85/16 BFG KO2 I might try it, but they don't (and I like "33's")
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Old 09-01-2019, 03:38 PM   #207
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Default Re: Tire Size 255/85/R16 for 4x4

I’m running 3 psi more on the right side of the van. Pulling is now extremely minor.
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Old 09-01-2019, 05:27 PM   #208
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Default Re: Tire Size 255/85/R16 for 4x4

I am considering this tire size. I have a 2016 4x4 that DOES NOT have low range (kind of a bummer). Can anyone comment on the gearing when not in low range on this tire size? Specifically when in off road situations. No serious off roading, but I do explore bad fire roads. Currently on stock sized Duratracs and not impressed. Thinking about either the ST Maxx or BFG all terrain. I’m concerned about losing torque in 1st gear.

Last edited by goldihop; 09-01-2019 at 05:39 PM.
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Old 09-02-2019, 01:20 AM   #209
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Default Re: Tire Size 255/85/R16 for 4x4

This may not be pertinent, most of you guys have 2500s, but Im running 265/75 16s on super single rims up front and they dont hit at all. The Duallys are 235/85-16s. Yes a 3500.
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Old 09-05-2019, 04:32 AM   #210
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Default Re: Tire Size 255/85/R16 for 4x4

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Originally Posted by goldihop View Post
I am considering this tire size. I have a 2016 4x4 that DOES NOT have low range (kind of a bummer). Can anyone comment on the gearing when not in low range on this tire size? Specifically when in off road situations. No serious off roading, but I do explore bad fire roads. Currently on stock sized Duratracs and not impressed. Thinking about either the ST Maxx or BFG all terrain. Im concerned about losing torque in 1st gear.
If you're at lower elevations - not going to be an issue. If you're at higher elevations (9K+ ft), you may find it an issue on really steep trails. If it's rough fire roads that you find brave Subaru drivers or other stock AWD type SUVs - you're going to be OK. If you're starting to push the limit where you're slowly working your way over rock steps or other features that require you to move slowly, you'll wish you had low-range (ST Maxx tires or not).
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