Which 37" tires are closest to an actual 37" inches in real life?

[ajkaz]

Tire pressure makes a large difference. I run 27-28 in my Toyo RT Trails and they are at 35.8” But for a load range E tire this is where they ride and wear the best.
At 35 they are hard as a rock and 36.5”.

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[SSinGA]

Because it makes no sense to run less than that. Mine wear even and ride great at 33 or 34 psi. Say what you want but under 30 for road use and your gonna have less life out of your tires.

It makes total sense. When chalk tested on the vehicle I've never had a single 37" tire be optimal above 30psi. The list includes Maxxis RAZR, BFG KO2, Micky Thompson Baja Boss AT, Cooper STT Pro, Nitto Mud Grappler, Nitto Ridge Grappler. All the mentioned tires have had excellent life spans with primarily daily driver, road use and once per month off road excursions. My 40s chalk out best at 26 psi.

 

[Jeeperjamie]

It makes total sense. When chalk tested on the vehicle I've never had a single 37" tire be optimal above 30psi. The list includes Maxxis RAZR, BFG KO2, Micky Thompson Baja Boss AT, Cooper STT Pro, Nitto Mud Grappler, Nitto Ridge Grappler. All the mentioned tires have had excellent life spans with primarily daily driver, road use and once per month off road excursions. My 40s chalk out best at 26 psi.

I've did the same to my 37's and the caulk test comes out perfect at 33 to 34. Not sure how your variables are different but I guess something must be different but if your good running them at that pressure then have at it. I've never had a problem getting perfect wear at 33 to 34 on any set I've ran. The better tires close to 50,000 with a 4 tire rotations

 

[SargeDiesel]

Wrong. I want people’s measurements from the top of the tire to the ground. And actual size. I bought 35’s for 3 of my vehicles and the tallest is an actual 33.5” tire. So yeah I want actual measurements.

WRONG:
If you measure the height of your tire when it is on your Jeep and loaded, you can be guaranteed that it will measure small. Why?? Because tire sizes are not specified that way! You have to measure the circumference (and calculate the diameter) with the tire mounted, aired up, and un-loaded.

Diamater = circumference / pi

(so take your circumference and divide by 3.14 to get your true diameter)

Measuring from side-side whilst tire is still on the Jeep (and under load) would work OK if you are accurate enough (with where you hold the tape). In fact, many tire manufacturers specify the tire diameter as: "Diameter: The measurement of an unloaded tire from one outer edge to the opposite edge." But not as accurate as the circumference measurement method.

Even if you are looking at section height you have to do it unloaded: "Section Height: The vertical distance measured from the edge of the bead to the center of the crown in a tire that is not under load."

The other way to measure cirumference whilst still on the car is to mark the tire and ground with chalk at the bottom of the tire, and then roll forward until the mark is at the bottom again and mark the ground there - measure the distance between the 2 lines, and divide by 3.14 to get your diameter.

 

[SargeDiesel]

Because it makes no sense to run less than that. Mine wear even and ride great at 33 or 34 psi. Say what you want but under 30 for road use and your gonna have less life out of your tires.

and real shitty gas mileage

 

[Kyle10]

Cooper sst pros. Run almost always to size !

 

[TheRealStreetcommander]

TyreRawck lists the tire specs in a back-page tab. At least for Firestone and Cooper tires, if the spec says actual tire size is 33.2" and 601 revolutions/mile, it's been pretty close to accurate IME.

 

[Wheelin98TJ]

Why?

Pick the tire you want, look at the specs, go up a size if needed.

Or just get a 39 if you want it to measure 37 top to bottom with weight on it.

 

[Camaroboi13]

Or just get a 39 if you want it to measure 37 top to bottom with weight on it.

I considered doing this too, till I realized it just didn’t matter. The difference between a 36.X” tire and a 37.X” tire is literally half an inch. If I need that half inch to make it over an obstacle then I’m probably doing something wrong in the first place.

Spoken from someone who runs 37” Ironman All country MTs at 35psi

 

[HappyGladiator]

WRONG:
If you measure the height of your tire when it is on your Jeep and loaded, you can be guaranteed that it will measure small. Why?? Because tire sizes are not specified that way! You have to measure the circumference (and calculate the diameter) with the tire mounted, aired up, and un-loaded.

Diamater = circumference / pi

(so take your circumference and divide by 3.14 to get your true diameter)

Measuring from side-side whilst tire is still on the Jeep (and under load) would work OK if you are accurate enough (with where you hold the tape). In fact, many tire manufacturers specify the tire diameter as: "Diameter: The measurement of an unloaded tire from one outer edge to the opposite edge." But not as accurate as the circumference measurement method.

Even if you are looking at section height you have to do it unloaded: "Section Height: The vertical distance measured from the edge of the bead to the center of the crown in a tire that is not under load."

The other way to measure cirumference whilst still on the car is to mark the tire and ground with chalk at the bottom of the tire, and then roll forward until the mark is at the bottom again and mark the ground there - measure the distance between the 2 lines, and divide by 3.14 to get your diameter.

This is exactly the way to do it!! The vehicle only cares about how much distance is covered in 1 rev of the tire. This way eliminates tire PSI and rim width.

 

[HooliganActual]

Wrong. I want people’s measurements from the top of the tire to the ground. And actual size. I bought 35’s for 3 of my vehicles and the tallest is an actual 33.5” tire. So yeah I want actual measurements.

WRONG:
If you measure the height of your tire when it is on your Jeep and loaded, you can be guaranteed that it will measure small. Why?? Because tire sizes are not specified that way! You have to measure the circumference (and calculate the diameter) with the tire mounted, aired up, and un-loaded.

Diamater = circumference / pi

(so take your circumference and divide by 3.14 to get your true diameter)

Measuring from side-side whilst tire is still on the Jeep (and under load) would work OK if you are accurate enough (with where you hold the tape). In fact, many tire manufacturers specify the tire diameter as: "Diameter: The measurement of an unloaded tire from one outer edge to the opposite edge." But not as accurate as the circumference measurement method.

Even if you are looking at section height you have to do it unloaded: "Section Height: The vertical distance measured from the edge of the bead to the center of the crown in a tire that is not under load."

The other way to measure cirumference whilst still on the car is to mark the tire and ground with chalk at the bottom of the tire, and then roll forward until the mark is at the bottom again and mark the ground there - measure the distance between the 2 lines, and divide by 3.14 to get your diameter.

This is exactly the way to do it!! The vehicle only cares about how much distance is covered in 1 rev of the tire. This way eliminates tire PSI and rim width.

I'm not disagreeing with what is or is not the right way to measure the tire here, but that's not what the OP was actually asking for. My assumption (and those make @sses out of U and Mption) is that he's probably more concerned with tire height as it relates to ground clearance.

Or perhaps, if you have a Tazer, it wants you to measure the tire as the OP described to plug in for making tire size adjustments. Personally I was disappointed when I measured my 37's to plug that number into my Tazer...maybe that's why he's asking what he is asking.

So maybe the issue isn't what the correct way is to measure a tire, rather, it's providing answers for the question asked. Just sayin'. Bring on the hate...

 

[SargeDiesel]

I'm not disagreeing with what is or is not the right way to measure the tire here, but that's not what the OP was actually asking for. My assumption (and those make @sses out of U and Mption) is that he's probably more concerned with tire height as it relates to ground clearance.

Or perhaps, if you have a Tazer, it wants you to measure the tire as the OP described to plug in for making tire size adjustments. Personally I was disappointed when I measured my 37's to plug that number into my Tazer...maybe that's why he's asking what he is asking.

So maybe the issue isn't what the correct way is to measure a tire, rather, it's providing answers for the question asked. Just sayin'. Bring on the hate...

NO hate... he asked for exact measurements (probably for the reasons you mentioned) and this method will give you exactly that, from my experience, the way he mentioned doesn't / has to many varibles Or atleast it did for me when I had to calibrate mine with a tazer. I was trying to be helpful, not just "correct".

 

[dcmdon]

Wrong. I want people’s measurements from the top of the tire to the ground. And actual size. I bought 35’s for 3 of my vehicles and the tallest is an actual 33.5” tire. So yeah I want actual measurements.

I'm not wrong. The size of the tire is the size of the tire without it being deflected by the weight of the vehicle.

If you want something that measures 37" deflected. Then I'd suggest looking at 39s. Because they will end up at about 37" with weight on them.

 

[dcmdon]

You can go with 40's and on a fully loaded rig and should be at 37's LOL

No. He wants a "true" 37. Ha.

There is a 17 page thread on another forum that discusses a certain w@y of life that perhaps has what you are looking for. Since i believe it is a banned site, I'll PM you the link.

Either way. A real 37 will measure small when the weight of the truck is on it. A real 37 will measure 37 unloaded or measured 9 to 3 o'clock.

the OP is making up his own new definition.

I also want a true 37. but I want you all to measure from the top of the tire lettering down to the lip of the rim at 6 o'clock. Or you can measure from the date code to the tire valve. ;-)

NO hate... he asked for exact measurements (probably for the reasons you mentioned) and this method will give you exactly that, from my experience, the way he mentioned doesn't / has to many varibles Or atleast it did for me when I had to calibrate mine with a tazer. I was trying to be helpful, not just "correct".

He's not just asking for measurements. He's making up new definitions. There won't be any tires that measure anywhere near 37" when measured the way he wants them measured.

 

[ArmyMP]

My KO2s measured 36.83"

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