NFRs2000NYC
Caught the Bug
My 315/75/16 Duratrac runs 33.75" @30psi.
Tires
- Thread starter jiggawhatpolo
- Start date
Are you talking 285/75r17?
I can see a 315/70r17 measuring the same or more than a 35x12.5 but a 285/70r17 is no where near a 35x12.5.
Yup yup my 305/70/16 true measure it's 32.3
At 40 psi
They are speced at 32.8 so that works out.
noroad
New member
Yup yup my 305/70/16 true measure it's 32.3
At 40 psi
AT 40 PSI ????? wow why
hinrichs
Caught the Bug
Either are my beadlocks technically, but I wouldnt run a non street legal tire.
TheStick
Member
The difference between a 315/70/17 and a 35 12.50 will mostly depend on air pressure, vehicle weight etc. in mounted they are very close within the same brand.
A 285/75/17 is only slightly less tall than a 35, but considerably narrower.
A 285/70/17 is comparable to a 33.
All will run less than advertised mounted under the weight of the vehicle.
Just remember that in the metric sizes the first 3 numbers are the width in mm. The second 2 are the sidewall height in relation to the width. You cannot determine the height of the tire without both, plus the wheel size. So don't assume all "285's" are the same. It's only one piece of the puzzle.
A 285/75/17 is only slightly less tall than a 35, but considerably narrower.
A 285/70/17 is comparable to a 33.
All will run less than advertised mounted under the weight of the vehicle.
Just remember that in the metric sizes the first 3 numbers are the width in mm. The second 2 are the sidewall height in relation to the width. You cannot determine the height of the tire without both, plus the wheel size. So don't assume all "285's" are the same. It's only one piece of the puzzle.
You're right, a 285 measures no where near 35" but a tire with 35" written on the sidewall measures no where near 35". Of course, you don't have to take my word for it, do what I've done and physically measure them yourself.
Agreed, there is always such confusion with metric tires.
Again I am trying to confirm what tire size your talking about?
A 285/75r17 11.3 x 33.9"
Or
A 285/70r17 11.3 x 32.8"
It has nothing to do with not believing you, but you need to specify which size as one is an inch smaller than the other.
And it is you who needs to physically measure a 35" tire and then you tell me. :rolleyes2:
Edited to remove my comments/questions , already answered I just didn't read far enough
And?? Please physically measure a tire with 35" printed on the side wall and tell me what it's actual measurement is? Granted, no two tires will measure the same and some will be shorter or taller than the next BUT, on average, what will it's height be?
No, I'm just talking about what an actual 35" tire will measure up to. Even the calculations you can get on the internet won't give you an exact diameter of a metric tire. What I'm talking about is what I have physically measured with my own hands and have found.
To be clear, just went outside and physically measured my 40" Trail Grapplers on Moby and they only came up to about 38". I just measured my 37" tires on Rubicat and they only came up to about 35". From experience, I can tell you that I've measured my old 35" tires that I had on Nemo and they only came up to about 33" and the 33's that I used to have on my old TJ only came up to about 31". You see where I'm going with all this?
Now, I have also gone out and physically measured the 285/70R17's on Plan-C and they came up to just shy of 32.5". So you tell me, what is that closer to? An advertised 33" tire or a 35"? I have personally run 305/70R17's on Moby and when I took a physical measurement of them, they came up to a bit over 33". While I have not personally run 315/70R17's, I do get to work on a lot of Jeep and the measurement I got off them were a bit over 34". I can't make this stuff up nor would I want to. I'm just trying to put the facts out there but of course, ya'll can believe in whatever chart or online calculator you find tells you. It's no sweat off my back
Now, I have also gone out and physically measured the 285/70R17's on Plan-C and they came up to just shy of 32.5". So you tell me, what is that closer to? An advertised 33" tire or a 35"? I have personally run 305/70R17's on Moby and when I took a physical measurement of them, they came up to a bit over 33". While I have not personally run 315/70R17's, I do get to work on a lot of Jeep and the measurement I got off them were a bit over 34". I can't make this stuff up nor would I want to. I'm just trying to put the facts out there but of course, ya'll can believe in whatever chart or online calculator you find tells you. It's no sweat off my back
Zstairlessone
New member
True, but that air pressure is what is supporting the vehicle's weight and the heavier the vehicle the more pressure you need for the same tire.
OverlanderJK
Resident Smartass
My 35" mud grapplers measure 33".
To be clear, just went outside and physically measured my 40" Trail Grapplers on Moby and they only came up to about 38". I just measured my 37" tires on Rubicat and they only came up to about 35". From experience, I can tell you that I've measured my old 35" tires that I had on Nemo and they only came up to about 33" and the 33's that I used to have on my old TJ only came up to about 31". You see where I'm going with all this?
Now, I have also gone out and physically measured the 285/70R17's on Plan-C and they came up to just shy of 32.5". So you tell me, what is that closer to? An advertised 33" tire or a 35"? I have personally run 305/70R17's on Moby and when I took a physical measurement of them, they came up to a bit over 33". While I have not personally run 315/70R17's, I do get to work on a lot of Jeep and the measurement I got off them were a bit over 34". I can't make this stuff up nor would I want to. I'm just trying to put the facts out there but of course, ya'll can believe whatever chart or online calculator tells you. It's no sweat off my back
I get the standard size tires do not measure close to what the sidewall does. I think there was confusion in what I was asking and what you were getting at. I was not contesting the size of a 35, but rather that a 285/70r17 measured close to a 35. I think what you meant was a 285/70r17 or a 285/75r17 measures closer to the speced height and not that a 285/70r17 is closer to a 35.
If I am wrong please let me know.
PS My 285/70r17 measure 32" at 32PSI on a 8.5"wide rim.
Last edited:
cozdude
Guy with a Red 2-Door
i agree with this. my 315/75r16 mud grapplers measured in at 34.25" last time i measured them
I can't make this stuff up nor would I want to. I'm just trying to put the facts out there but of course, ya'll can believe in whatever chart or online calculator you find tells you. It's no sweat off my back
FWIW: my question that I later edited away was only for my clarification, not to second guess based on interweb calculators. I didn't know this about the metric tire sizes... (I learned something today!)