The 13.50's is what I run and mainly because of the range E rating. I just run them at a lower psi like 28 or so.
I'm moving from my 35" KM2s to 37" STT Pros. I'm inclined to go to the 13.50x17 because it is Load Range E (likely a stronger sidewall) but am concerned that the ride will be too stiff for my 2014 Rubicon X that has (probably) 800# of added weight through various mods and adds. The 12.5x17 is offered in Load Range D which is what I run on the KM2s and the ride is OK. Any opinions on the various trade-offs would be appreciated. Thx
The 13.50's is what I run and mainly because of the range E rating. I just run them at a lower psi like 28 or so.
Click on the links below to improve your Jeep, your wardrobe and to help support WAYALIFE!
CB BAR | AIR COMPRESSOR MOUNT | HITCH STINGER | DECALS | SWAG | TOOLS
JT / 2020 Bright White Jeep Gladiator Rubicon
JET LI / 2018 Bright White Jeep JL Wrangler Rubicon Unlimited
MOBY DICK / 2007 Stone White JK Rubicon Unlimited
RONA / 1993 Navajo Turquoise Metallic Jeep YJ Wrangler
CALAMITY JANE / 1974 Jetset Blue Metallic Jeep CJ-5 Renegade
RUSTY / 1972 White/Blue Jeep J2000 Pick-Up Truck
EMMA / 1969 White Kaiser Jeepster Commando C101
PAPPY / 1954 Yellow Willys CJ3B
I was wondering the same thing, as that will likely be my next set of tires.
Glad to hear it.
I have the 37x13.50s Load range E. I’m running 28psi on highway and 12 off road. They ride fine.
Sent from my iPhone using WAYALIFE mobile app
I will echo what everyone is saying as well. I run the STT pro in a 37x13.50 load range E on my 4dr and I’m probably close to 700 lbs heavier than stock. But that’s just s guess. I run 28-30 psi and it’s fine on the roads here in salt lake. Trail pressure is 8-12 depending where I’m at.
Exact same for me as well
Sent from my SM-G950U using WAYALIFE mobile app
12' 2dr Gecko Sport 6 speed
PR44, ARBs, 4.88s, 35 spline rear, Adams 1350 Front & Rear, Rubi T-case, Rubi sway bar + Evo no limits, Evo armor & skids, 37/13.50" Cooper STT Pro, Evo 2" plush / OME med duty springs
***SOLD*** 08' JKU Rubicon 6-speed Stone White, 3.5" RK lift, 37" KM2s and lots more.
***CURRENT DD*** 16' F150
I'm running the 37x13.50's Coops too. My CAT scale weight fully loaded is just under 6000#. I run 26# highway, but our roads in PA suck donkey dick, so there's that. Best starting point to figure psi is to do the chalk test. You can fine tune from there if you want![]()
https://wayalife.com/showthread.php/...build-of-Gruff
Gruff 2014 JKU Moneypit
Badger 2019 JLUR waiting for scraps
That’s the only thing I don’t love about jumping to 40’s. The STT’s (as well as Nitto) go to a C rating. Does stiffer sidewall necessarily mean stronger, though? Ply is still the same right?
Sent from my iPhone using WAYALIFE mobile app
I was wondering the same thing. The BFG 39-13.5s go to a load range c as well. Are the plys thicker on the larger tires? Is that why they don’t use as many as the Ds and Es?
Sent from my iPhone using WAYALIFE mobile app
2015 JKU Rubicon AEV JK350
1985 Jeep CJ8 Scrambler