Highway pressure for 37's on a 392XR?

[stumblinhorse]

That is not the tire my 2021 392XR came with from the factory. Mine came with 35x12.5R17 113/110S KO2. Perhaps the 2022 models have a different tire now?

That tire is not on the BFG site…. I edited once I remembered you have an XR. So they are prolly mopar only KO2s.

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[richk225]

My 2021 392 Rubicon XR came with BFG KO2`s 315/70/17 C range and I had BFG KO2 37x12.50x17`s put on before I picked it up. The BFG KO2 35x12.50 x17 is a C range tire
The 3 BFG KO2 tires size 315/70/17 all have a 8"-11" rim recommendation, one is for a Jeep and has a S speed rating, one is for the Ford Raptor and has a T rating, and one has a E range and is discontinued according to BFG. The 35x12.50x17 has a E range and a R speed rating and has a recommended rim size of 8.5"-11"

https://www.bfgoodrichtires.com/auto/tires/all-terrain-t-a-ko2?tyreSize=17#sizes

 

[stumblinhorse]

Wonder why some got 35s and some 315s?

A 2022 with 315s

https://www.jlwranglerforums.com/forum/threads/xr-wheels-tires.90639/

 

[Chris-AZ]

My 2021 392XR arrived at dealer on 35’s (not 315’s) in 3rd week of December and I picked it up 1st week of January. Maybe they ran out of 315’s? AFAIK, the 35’s are supposed to be on a 8.5” rim. But I’m not going to dismount to measure.

 

[stumblinhorse]

My 2021 392XR arrived at dealer on 35’s (not 315’s) in 3rd week of December and I picked it up 1st week of January. Maybe they ran out of 315’s? AFAIK, the 35’s are supposed to be on a 8.5” rim. But I’m not going to dismount to measure.

Agree, most 35s the manufacturer specs 8.5” rims. But not the 315 KO2s. So for sure XR rims are only 8“. So wonder how Jeep can explain having the 35s out in the wild on XR rims.

 

[1996cc]

That is cool that you can still drive like that at 90 years old LOL
That`s more like fly a way speed!
Are you running true bead locks?

Yes. KMC XD 231’s

 

[Whaler27]

I agree with you, when I picked up my 392 XR it had 37 psi in all 4 tires and after a hour of driving this went up to 40 psi. I have always run nitrogen in my tires to combat this problem, one benefit of Costco. There are other ways to purchase it and it does make the tire run cooler and not suffer as much air loss due to being a gas that is more dense than air

Nitrogen doesn’t combat that problem.

Nitrogen, like all gasses, responds to temperature.

The air we breathe is approximately 80% nitrogen anyway, so any effect from swapping to 100% nitrogen has a bigger impact on your wallet than your tire behavior.

 

[richk225]

Nitrogen doesn’t combat that problem.

Nitrogen, like all gasses, responds to temperature.

The air we breathe is approximately 80% nitrogen anyway, so any effect from swapping to 100% nitrogen has a bigger impact on your wallet than your tire behavior.

Thanks for the info, much appreciated

 

[veddersbetter]

My 2021 392XR arrived at dealer on 35’s (not 315’s) in 3rd week of December and I picked it up 1st week of January. Maybe they ran out of 315’s? AFAIK, the 35’s are supposed to be on a 8.5” rim. But I’m not going to dismount to measure.

Interesting .. mine was built around the last day of 21 production.. 12/18 or 12/21 I think.. and arrived second week in January.. mine are 315's. I assumed they all were

 

[Petes_392]

My 2021 392XR arrived at dealer on 35’s (not 315’s) in 3rd week of December and I picked it up 1st week of January. Maybe they ran out of 315’s? AFAIK, the 35’s are supposed to be on a 8.5” rim. But I’m not going to dismount to measure.

Can you post a picture of the sidewall showing the tire size..??

 

[Covet]

Isn’t 35 vs 315 at most only like a 0.5” difference? Sounds like similar/same tires to me

 

[richk225]

Isn’t 35 vs 315 at most only like a 0.5” difference? Sounds like similar/same tires to me

BFGOODRICH® ALL-TERRAIN T/A KO2 - 35X12.50R17/E 121R RWL

35X12.5R17 121R RWL
BUY NOW
MSPN66539
Mileage Warranty50,000
Section Width on Measuring Rim Width12.50" on 10.00"
Overall Diameter34.5
Max Load, Single (LB @ PSI)3195 @ 65
Revs/MI602
Tire Weight66.36
Rim Width Range (Min/Max)8.50-11.00
Tread Depth (in 32nds)151
Specifications
- 3PMSF- M+S

BFGOODRICH® ALL-TERRAIN T/A KO2 - LT315/70R17/C 113S RBL
BUY NOW
MSPN
08884
Mileage Warranty
50,000
Section Width on Measuring Rim Width
12.70" on 9.50"
Overall Diameter
34.4
Max Load, Single (LB @ PSI)
2535 @ 45
Revs/MI
604
Tire Weight
63.40
Rim Width Range (Min/Max)
8.00-11.00
Tread Depth (in 32nds)
151
Specifications
3PMSF
M+S

BFGOODRICH® ALL TERRAIN T/A KO2 - 315/70R17 121S RBL
BUY NOW
MSPN
08806
Mileage Warranty
50,000
Section Width on Measuring Rim Width
12.70" on 9.50"
Overall Diameter
34.4
Max Load, Single (LB @ PSI)
3195 @ 65
Revs/MI
604
Tire Weight
65.21
Rim Width Range (Min/Max)
8.00-11.00
Tread Depth (in 32nds)
151
Specifications
3PMSF
M+S

BFGOODRICH® ALL-TERRAIN T/A KO2 - LT315/70R17/C 113T RBL
BUY NOW
MSPN
07361
Mileage Warranty
50,000
Section Width on Measuring Rim Width
12.70" on 9.50"
Overall Diameter
34.4
Max Load, Single (LB @ PSI)
2535 @ 45
Revs/MI
604
Tire Weight
63.67
Rim Width Range (Min/Max)
8.00-11.00
Tread Depth (in 32nds)
151
Specifications
3PMSF
M+S

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