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Old 07-01-2019, 01:18 AM
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37 or 38’s?

Thinking about Milestar Patagonia 37/12.5/17 or 38/13.5/17. I know 37’s weigh 72lbs. 38’s about 80lbs. . 37in Trail GrApplers are 82.5lbs. Any concerns for that extra inch or 10extra pounds?

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Old 07-01-2019, 07:24 AM   #2
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You already posted a similar thread here, would you like me to merge them?:

https://www.wranglerforum.com/f274/thinking-about-milestone-patagonia-37-12-5-17-or-the-38-13-5-17-a-2367221.html?amp=1

No one can say "oh yeah a 37 that weighs 4 pounds less will be much better than a 38". Its about way more than weight. Mass, width, build that supports it, way you drive it etc.

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Old 07-01-2019, 09:51 AM   #3
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Also keep in mind not all tires are the size advertised. Manufacturer spec sizes are also not to be believed. These two tires are suppose to be the SAME size.
Brand new Mastercraft MXT 37x12.50x17 vs well used Pitbull Rocker 37x12.50x17.



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Old 07-01-2019, 11:03 AM   #4
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Jumping from 37x12.5x17 General Grabber X3s to 38x13.5x17 Milestar Patagonias was only a 3lb difference per wheel. That's negligible. 15lbs total is not something you or your engine would notice. There was a 1.5 inch height difference though. Even at a claimed 38, the Milestars only measured 37 from the ground up, at 30psi.

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Old 07-01-2019, 12:40 PM   #5
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38" tires are the new 37" tire

LOL
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Old 07-01-2019, 12:55 PM   #6
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38" tires are the new 37" tire

LOL
No kidding

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Old 07-01-2019, 03:29 PM
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You already posted a similar thread here, would you like me to merge them?:

https://www.wranglerforum.com/f274/t...221.html?amp=1

No one can say "oh yeah a 37 that weighs 4 pounds less will be much better than a 38". Its about way more than weight. Mass, width, build that supports it, way you drive it etc.
Yeah, I realized that after I hit send. Sorry. I forgot I even posted something last week.
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Old 07-01-2019, 04:01 PM   #8
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38" tires are the new 37" tire

LOL
I think litebrite made them popular. Those damn Youtube influencers!
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Old 07-01-2019, 05:46 PM   #9
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I think litebrite made them popular. Those damn Youtube influencers!
They definitely did. I bought this set directly from them.

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Old 07-01-2019, 06:00 PM   #10
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Originally Posted by Silentfoe View Post
Jumping from 37x12.5x17 General Grabber X3s to 38x13.5x17 Milestar Patagonias was only a 3lb difference per wheel. That's negligible. 15lbs total is not something you or your engine would notice. There was a 1.5 inch height difference though. Even at a claimed 38, the Milestars only measured 37 from the ground up, at 30psi.

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and what did the grabbers measure out @30psi?
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Old 07-01-2019, 08:55 PM   #11
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and what did the grabbers measure out @30psi?
35.6

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Old 07-01-2019, 09:26 PM   #12
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The tire for the job. That's the goal.
As far as size...the March to 40's as the tire size of our era has begun.
First it was 33's then 35's...37's now....

Get the size you think you want +1.
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Old 07-01-2019, 10:22 PM   #13
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I must be getting old and brain calcification setting in. More and more posts just don’t compute in my mind. I see comments about slapping 38 x 13.5 tires on a JK without mention of about $10,000 in other necessary mods, and I read threads about people routinely driving their jeeps at 75 mph - and considering swerving for a deer. Who drives that fast in a jeep, but OMG you take the hit. Some are posting pictures of their speedometers in the 90s. I hope for their sake it’s photo shopped. Can you imagine passing an approaching semi on a 2 Lane Rd. doing 90? If your fenders don’t fly off your hood will most certainly be in your windshield if all you have is rubber tiedowns. Now let me get back in my rocker…
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Old 07-02-2019, 11:04 AM   #14
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Originally Posted by AndyU View Post
I must be getting old and brain calcification setting in. More and more posts just donít compute in my mind. I see comments about slapping 38 x 13.5 tires on a JK without mention of about $10,000 in other necessary mods, and I read threads about people routinely driving their jeeps at 75 mph - and considering swerving for a deer. Who drives that fast in a jeep, but OMG you take the hit. Some are posting pictures of their speedometers in the 90s. I hope for their sake itís photo shopped. Can you imagine passing an approaching semi on a 2 Lane Rd. doing 90? If your fenders donít fly off your hood will most certainly be in your windshield if all you have is rubber tiedowns. Now let me get back in my rockerÖ
We're talking about tires. If you want to talk about all the other mods necessary to running big tires, we can do that, and it has been done. Don't think that it hasn't been discussed.

As far as high speeds, do the build right and there isn't a problem. Out West (I'm not looking at your profile to see where you are) our freeway speeds are high. Lowest posted speed in my area is 70. Highest is 80. I have no worries setting the cruise control at 80 or slightly higher. It runs just fine. Sure, if I had to make a sudden emergency move, I might have more of a problem but I don't linger on worries. I drive defensively and take it from there.

Now, back to tires.

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Old 07-02-2019, 11:14 AM   #15
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I had 37" Copper STT Pros, then made the switch to 38" milestars. They are about the same weight, about .75 inch taller. I went with the 38's because they were stupid cheap ($204). I had to trim a bit of the fenders to keep from rubbing though
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Old 07-02-2019, 11:20 AM   #16
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@phxchargerfan

Looks good, how tall are your 38" Milestars and at what tire pressure?

Thanks!

EDIT: Sorry, I see @Silentfoe already provided that measurement for the 38" Milestars- 37" at 30 psi
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Old 07-02-2019, 11:49 AM   #17
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Originally Posted by AndyU View Post
I must be getting old and brain calcification setting in. More and more posts just donít compute in my mind. I see comments about slapping 38 x 13.5 tires on a JK without mention of about $10,000 in other necessary mods, and I read threads about people routinely driving their jeeps at 75 mph - and considering swerving for a deer. Who drives that fast in a jeep, but OMG you take the hit. Some are posting pictures of their speedometers in the 90s. I hope for their sake itís photo shopped. Can you imagine passing an approaching semi on a 2 Lane Rd. doing 90? If your fenders donít fly off your hood will most certainly be in your windshield if all you have is rubber tiedowns. Now let me get back in my rockerÖ

Sounds like your driving skills are poor?. Some of my posted speed limits here (Texas, Wyoming also) are 80 and every vehicle is doing these including: Semi trucks, lifted trucks, jeeps, etc.

Just because something is uncomfortable/scary for you doesn't mean it is the same for others. This is why high dives, roller coasters, fire engine ladders, etc exist.

As to OP. I have 37s but no interest in 38s. I just don't need to push it MORE.
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Old 07-02-2019, 12:43 PM   #18
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@phxchargerfan

Looks good, how tall are your 38" Milestars and at what tire pressure?

Thanks!

EDIT: Sorry, I see @Silentfoe already provided that measurement for the 38" Milestars- 37" at 30 psi



Mine measured at 37.4 @28 psi
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Old 07-02-2019, 03:49 PM   #19
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My apologies, my ramblings threw me off course. I replaced my BFG KO2s with the mile star Patagonia 37 x 12 50 for the added inch over the run small BFG’s and didn’t even consider tire weight. So as usual I have nothing of value to add to the discussion. But I am living at almost 9000 feet and my acceleration sucks regardless. Good thing I never need to go over 45 miles an hour and typically am at 25 mph or less where I routinely drive.
As for my driving skills being poor, I’m not sure what skill it takes to drive 80 down the interstate, but I can slide off of slick Sierra Granite and into a lodgepole pine with the best of them.
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Old 07-02-2019, 06:19 PM   #20
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Originally Posted by txjeep15 View Post
Thinking about Milestar Patagonia 37/12.5/17 or 38/13.5/17. I know 37ís weigh 72lbs. 38ís about 80lbs. . 37in Trail GrApplers are 82.5lbs. Any concerns for that extra inch or 10extra pounds?
All things considered equal and assuming the 37s are 37 and the 38s are 38, there is a 2.5% difference in circumference. That means the jeep will move 2.5% further each rotation. However the motor will turn the same number of turns creating the same power. So you realize effective a 2.5% decrease in horsepower performance at the wheel.
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Old 07-03-2019, 12:00 AM   #21
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Originally Posted by phxchargerfan View Post
I had 37" Copper STT Pros, then made the switch to 38" milestars. They are about the same weight, about .75 inch taller. I went with the 38's because they were stupid cheap ($204). I had to trim a bit of the fenders to keep from rubbing though
They look good! Road noise looks like it should be a bit less. Is it?
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Old 07-03-2019, 11:41 AM   #22
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Talking

When I started 31" tires were yuuuuge. LOL
"We will never need anything bigger than a 31" Yokohama "dog bone" tread!!!"
Now I run anywhere from a 37" to a 39" and still feel inadequate sometimes.




Quote:
Originally Posted by RubiconSS View Post
The tire for the job. That's the goal.
As far as size...the March to 40's as the tire size of our era has begun.
First it was 33's then 35's...37's now....

Get the size you think you want +1.
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Old 07-03-2019, 11:55 AM   #23
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when i started 31" tires were yuuuuge. Lol
"we will never need anything bigger than a 31" yokohama "dog bone" tread!!!"
now i run anywhere from a 37" to a 39" and still feel inadequate sometimes.
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Whenever I "need" my 35's to be more like 37's ((-
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Old 07-03-2019, 12:14 PM   #24
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Will that work on my suspension?
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Old 07-03-2019, 05:20 PM   #25
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They look good! Road noise looks like it should be a bit less. Is it?



Road noise is noticeably quieter. Plus the ride is not nearly as firm (E vs C)
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