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      02-09-2022, 11:44 AM   #1
Influence
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Anyone running 285/40/ZR22 and 325/35/ZR22 combo on their F15?

I need to replace my 295/30/22 + 335/25/22 Scorpion Asymetricos but developed the transfer case "stutter." I'm going to have the transfer case flushed and reset but once I put my stock 255/50/19s (all around) on for the winter the stutter went away.

I figure the transfer case stutter is due to the well-know issue now of the overall diameter difference between the 295/30/22 and 335/25/22 combo being outside of 1%.

I know I can move to a 285/30/22 front with the 335/25/22 rear (sadly only available in the Michelin PS4S which will be around $2400 installed) and bring the diameter difference under 1% but has anyone tried running a 285/40/22 on the front with a 325/35/22 on the rear? I know that this will add almost 2" to the overall diameter (31" vs about 29.1") but I think the beefier sidewall would look a lot better, and add some additional cushion to protect the 22" rims.

I think clearance would be ok, but looking to see if anyone has tried this combo on an F15. Since both fronts and rears will be exactly 31" diameter I don't think there will be any other driveline issues either besides the speedo reading about 2.5% high

Any other tire size suggestions are welcome too.
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      02-09-2022, 02:24 PM   #2
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I think 31" will hit the front upper control arm and likely the inner fender liner when turning

Edit: this is based on research I've done and pics of other tire setups I've seen on the F15. My conclusion is the beefiest tire I can fit on an 18" is 265/60/18 without changing too much...this is about 30.52" diameter
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My wife would give me so much head if I did that.
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      02-13-2022, 10:15 AM   #3
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Quote:
Originally Posted by Vivek. View Post
I think 31" will hit the front upper control arm and likely the inner fender liner when turning

Edit: this is based on research I've done and pics of other tire setups I've seen on the F15. My conclusion is the beefiest tire I can fit on an 18" is 265/60/18 without changing too much...this is about 30.52" diameter
Grabbbed a ruler and did some measurements. I think you are spot on. It doesn't look like there is more than an extra inch or so of overall diameter I can increase things without hitting the upper control arm.

So no more than about 30.25" or so seems like the max and even that might be pushing it
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      02-14-2022, 05:58 PM   #4
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Quote:
Originally Posted by Influence View Post
Grabbbed a ruler and did some measurements. I think you are spot on. It doesn't look like there is more than an extra inch or so of overall diameter I can increase things without hitting the upper control arm.

So no more than about 30.25" or so seems like the max and even that might be pushing it
Keep in mind that the change in overall diameter will only be 50% at the top, but yeah 30.25 should be more than safe.
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My wife would give me so much head if I did that.
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      02-15-2022, 01:22 PM   #5
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If you service your transfer case it should remedy the issues with those tire sizes for quite some time so that might be easier than buying new tires.
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      03-08-2022, 02:07 PM   #6
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Quote:
Originally Posted by parthpatel1 View Post
If you service your transfer case it should remedy the issues with those tire sizes for quite some time so that might be easier than buying new tires.
The tires are shot anyway, so I need to get new tires.

Got the transfer case serviced and my shop showed me the fluid. it was black

Shop owner said the fluid looked like it came from a car with 80-100k miles on it, not 49k. He said the dirtiness/contamination is from the slippage I was experiencing with the tire differential (basically wearing of the material which contaminates the fluid). And I only had the 295/335 22" combo on the car for about half of the 49k miles (they are the "summer" set of wheels/tires).

Let my experience serve as a warning to everyone, don't go for the 295/30/22 + 335/25/22 combo. It is just too much of a diameter differential for the transfer case and it will eventually do damage.

Still trying to find a better option than the 285/335 Pilot sport 4S combo. I see Pirelli has a 275/35/22 + 315/30/22 combo that could also work in P Zero All Season, but that is like a $2300 tire setup as well. Though the treadlife is much higher at a 500 vs the 300 on the PS4S. might be worth it in the long run.
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      03-08-2022, 09:36 PM   #7
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Quote:
Originally Posted by Influence View Post
Quote:
Originally Posted by parthpatel1 View Post
If you service your transfer case it should remedy the issues with those tire sizes for quite some time so that might be easier than buying new tires.
The tires are shot anyway, so I need to get new tires.

Got the transfer case serviced and my shop showed me the fluid. it was black

Shop owner said the fluid looked like it came from a car with 80-100k miles on it, not 49k. He said the dirtiness/contamination is from the slippage I was experiencing with the tire differential (basically wearing of the material which contaminates the fluid). And I only had the 295/335 22" combo on the car for about half of the 49k miles (they are the "summer" set of wheels/tires).

Let my experience serve as a warning to everyone, don't go for the 295/30/22 + 335/25/22 combo. It is just too much of a diameter differential for the transfer case and it will eventually do damage.

Still trying to find a better option than the 285/335 Pilot sport 4S combo. I see Pirelli has a 275/35/22 + 315/30/22 combo that could also work in P Zero All Season, but that is like a $2300 tire setup as well. Though the treadlife is much higher at a 500 vs the 300 on the PS4S. might be worth it in the long run.
That is concerning especially considering how many people on the F15/F85 platform run that tire combo haha.
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      05-09-2022, 01:02 PM   #8
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Anyone running 275/35/22 fronts with a 315/30/22 rear? There are a few options in these tire sizes. Overall diameter is 29.5/29.6" so there should be no issues with the transfer case and I think clearance will be fine but it's always good to hear from someone who has actually run the combo.
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      10-10-2023, 08:29 PM   #9
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I have that size and it runs good but i want more side wall the back always looks smaller it bothers the hell out of me. I have a e71 2013 i just want to do 285/40 325/35/22 rear but idk if it will fit up front
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      10-11-2023, 10:45 AM   #10
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Thanks for the discussion! Nice to learn those nuances, since I am also considering 22s.
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      10-12-2023, 06:05 AM   #11
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Quote:
Originally Posted by Influence View Post
Anyone running 275/35/22 fronts with a 315/30/22 rear? There are a few options in these tire sizes. Overall diameter is 29.5/29.6" so there should be no issues with the transfer case and I think clearance will be fine but it's always good to hear from someone who has actually run the combo.
I have a set of Pirelli P Zeros in these sizes that I’ll be installing next week. I’ll follow up and let you know my thoughts. I found a few other posts of members running this combo with no issues. I liked the idea of more sidewall too.
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