The Ultimate TRUE TIRE SIZE Database

Nitro Mud Grapplers 37x13.5r17IMG_6433.jpg

36” give or take.


2014 JKUR (named Terence by my son)w 4.88’s and 37’s for off road fun! +1975 CJ5, 304, 3.73’s in the family 23+ years
 
37x12.5R17

General Grabber AT/X
35 11/16”
36” to the very top

Revs Per Mile Calculation ended up being pretty accurate

561 divided by 63360 inches in a mile divided by Pi = 35.95 inches
 

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BFG 35 x 18 KO2

There's been some pics so I wont repeat that but my BFG 35"s measure right about 33 3/4 but doing a speedo calibration I had to set the tire size to 33 1/2" to get my GPS and speedometer to sync together.
 
315/70r17 BF Goodrich A/T KO 2

Measured 33.4 as the previous formula suggested. 3 miles. Confirmed with gps speedometer app set at 33.5" (nearest setting), 33.25 was consintantly off by 1-2 MPH.
 

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2020 JLURD said:
so 39" bfg km3 are a 36.5"? Maybe I should get the 39" instead of the 37" km3..
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As I clearly state in my very first post on this thread, "when it comes to things like lift kits and tires you can run with them, EVERY manufacturer, shop and person in the industry will always refer to what is written on the sidewall and NOT the true height of the tire."
 
wayoflife said:
As I clearly state in my very first post on this thread, "when it comes to things like lift kits and tires you can run with them, EVERY manufacturer, shop and person in the industry will always refer to what is written on the sidewall and NOT the true height of the tire."
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That doesn't help me decide...:)

I did see in another thread that someone had the bfg km3 39" measured at 37.8".
 
2020 JLURD said:
That doesn't help me decide...:)

I did see in another thread that someone had the bfg km3 39" measured at 37.8".
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Are you running 1-ton axles? If not, you're wanting to play with way more tire than your factory axles can handle. That should help you to decide a lot.
 
wayoflife said:
Are you running 1-ton axles? If not, you're wanting to play with way more tire than your factory axles can handle. That should help you to decide a lot.
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So the D44 can't handle a BFG 39"? The jeep is a 3rd vehicle and we use it to cruise around in until my post barn gets built. Then I might add some different axles and bead locks.

The BFG 39" tires measure at 36.5-37.5" tall but other companies 37" tires measure in the same ball park are okay for trail use? I'm confused.
 
2020 JLURD said:
So the D44 can't handle a BFG 39"? The jeep is a 3rd vehicle and we use it to cruise around in until my post barn gets built. Then I might add some different axles and bead locks.

The BFG 39" tires measure at 36.5-37.5" tall but other companies 37" tires measure in the same ball park are okay for trail use? I'm confused.
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People that throw around the phrase 'I run 39 inch tires' are talking about what's printed on the sidewall. Keep that in mind. So if someone is saying 37s aren't ideal for a Dana 44, then 39s certainly are not.
 
2020 JLURD said:
So the D44 can't handle a BFG 39"? The jeep is a 3rd vehicle and we use it to cruise around in until my post barn gets built. Then I might add some different axles and bead locks.
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Cruising around town, you could probably run 46's or bigger and be fine.
2020 JLURD said:
The BFG 39" tires measure at 36.5-37.5" tall but other companies 37" tires measure in the same ball park are okay for trail use? I'm confused.
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You're confused because you aren't actually reading what I've been posting or at least, not very carefully. That, or you're just tuning out what you don't want to hear LOL.
 
WJCO said:
People that throw around the phrase 'I run 39 inch tires' are talking about what's printed on the sidewall. Keep that in mind. So if someone is saying 37s aren't ideal for a Dana 44, then 39s certainly are not.
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Listen to this guy LOL (y)
 
2020 JLURD said:
The BFG 39" tires measure at 36.5-37.5" tall but other companies 37" tires measure in the same ball park are okay for trail use? I'm confused.
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Cooper 37's are 35.125" post #2
Mastercraft 37's are 35.125" post #62
Nitto TG 37's are 35.5 Post #70
Goodyear MTR 37's are 36" post #84
BFG KM2 37's are 34.75" post #94

None of them are measuring 36.5-37.5"

If you want to run the BFG 39" just do it already, you don't need anyone else's approval.
 
WJCO said:
People that throw around the phrase 'I run 39 inch tires' are talking about what's printed on the sidewall. Keep that in mind. So if someone is saying 37s aren't ideal for a Dana 44, then 39s certainly are not.
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I understand what people say about the sizes. I'm not debating that. Yes people say "I run 40s on stock axles" and it understood that they are running a 40x13.5x20/17 tires.

But does the actual height of the tire that is on the vehicle make a difference if both measure roughly the same? a Nitto 38" runs larger than a BFG 39" in actual size. Some 37/38/39" tires are fairly close to each other in actual overall height. People will say you can run a 37x12.5x17 all day, but a 39x12.5x17 is too big for the axles, even though they are roughly the same height. Is there a magical tire height that you shouldn't exceed for stock axles?

post #281 and 284 are 36" give or take. Nitto Mud grapplers and General grabber
 
2020 JLURD said:
I understand what people say about the sizes. I'm not debating that. Yes people say "I run 40s on stock axles" and it understood that they are running a 40x13.5x20/17 tires.

But does the actual height of the tire that is on the vehicle make a difference if both measure roughly the same? a Nitto 38" runs larger than a BFG 39" in actual size. Some 37/38/39" tires are fairly close to each other in actual overall height. People will say you can run a 37x12.5x17 all day, but a 39x12.5x17 is too big for the axles, even though they are roughly the same height. Is there a magical tire height that you shouldn't exceed for stock axles?

post #281 and 284 are 36" give or take. Nitto Mud grapplers and General grabber
Click to expand...
I have NEVER seen a 37" tires measure "roughly the same" as a 39" tire AND and would go so far as to say that I have personally seen plenty of axle breaks with just 37's. Granted, I'm just a mall crawler and wouldn't pretend to know as much as what "people" will say. As CalSgt said, just do it already! You don't need anyone else's approval. (y)
 
wayoflife said:
I have NEVER seen a 37" tires measure "roughly the same" as a 39" tire AND and would go so far as to say that I have personally seen plenty of axle breaks with just 37's. Granted, I'm just a mall crawler and wouldn't pretend to know as much as what "people" will say. As CalSgt said, just do it already! You don't need anyone else's approval. (y)
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I'm sure people break stock axles with stock tires as well. And I know who you are, I watch your channel, that's why I'm asking. Not sure why you are being facetious.
 
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