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Thread: The Ultimate TRUE TIRE SIZE Database

  1. #221
    Resident Smartass OverlanderJK's Avatar
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    Quote Originally Posted by jhm1 View Post
    Hummm, although this is a great thread, i take some exception to the measuring methods. i went out and measured my new jl 2019 jeep tires(I'm new, haven't figured out how to post photos yet). i used a square clamp and measured like a caliper in the center of the wheel while hanging on the wheel rack(no weight). the tire is 245/75/r17 printed on the side wall. this metric equals 31.5". the tire measured 31.47". then i did as the post instructions requested, and went to the ground up measurement. it was 30.9375. the .5" difference is the "belly" of the tire sinking in a bit. all tires do the same thing. at 30 psi the tires still have the belly sag. the second issue is how we look from the tape measure to the tire thread, and at what angle. if a 12" level was laid across the tires, and measured would be more accurate. by analyzing the data posted, there is a direct correlation by the tire sizes small to large by the difference of the stated size vs actual size. as 1 example an BFG MUD_TERRAIN T/A KM3 lt295/70/r17 states the overall diameter at 33.3" at proper pressure. the company states the max psi is 80 psi. if this tire is deflated to 30 psi im not surprised to see a 1.5" to 2" smaller measurement. bfg's "35" is stated to be 34.6". i think this is closer to correct than 33" reported here. also consider a tire rolling/spinning at 624 revs per mile, at 70 mph, is probably larger in diameter.

    the question i'm trying to answer, is what is the maximum size tire i can install on a stock/no lift 2019 jl sport 2 dr Jeep wrangler? has anyone had first hand experience ?
    Holy fuck. Leave all that other shit out and just ask what tire size.


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  2. #222
    Nothing but a Thing 2nd.gunman's Avatar
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    Quote Originally Posted by jhm1 View Post
    Hummm, although this is a great thread, i take some exception to the measuring methods. i went out and measured my new jl 2019 jeep tires(I'm new, haven't figured out how to post photos yet). i used a square clamp and measured like a caliper in the center of the wheel while hanging on the wheel rack(no weight). the tire is 245/75/r17 printed on the side wall. this metric equals 31.5". the tire measured 31.47". then i did as the post instructions requested, and went to the ground up measurement. it was 30.9375. the .5" difference is the "belly" of the tire sinking in a bit. all tires do the same thing. at 30 psi the tires still have the belly sag. the second issue is how we look from the tape measure to the tire thread, and at what angle. if a 12" level was laid across the tires, and measured would be more accurate. by analyzing the data posted, there is a direct correlation by the tire sizes small to large by the difference of the stated size vs actual size. as 1 example an BFG MUD_TERRAIN T/A KM3 lt295/70/r17 states the overall diameter at 33.3" at proper pressure. the company states the max psi is 80 psi. if this tire is deflated to 30 psi im not surprised to see a 1.5" to 2" smaller measurement. bfg's "35" is stated to be 34.6". i think this is closer to correct than 33" reported here. also consider a tire rolling/spinning at 624 revs per mile, at 70 mph, is probably larger in diameter.

    the question i'm trying to answer, is what is the maximum size tire i can install on a stock/no lift 2019 jl sport 2 dr Jeep wrangler? has anyone had first hand experience ?
    So in summary, we’re all doing it wrong but you want our opinions anyway?


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  3. #223
    That dude from Mississippi notnalc68's Avatar
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    Quote Originally Posted by 2nd.gunman View Post
    So in summary, we’re all doing it wrong but you want our opinions anyway?


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    Fock. I have to measure again?


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  4. #224
    Addict BaddestCross's Avatar
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    Quote Originally Posted by TrailHunter View Post
    The Stock tires on my JK are 31”.

    Attachment 325218

    Welcome to Wayalife.
    Lol. When I measure my 37s like that they come out to 73s. 😂

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  5. #225
    Old Timer fiend's Avatar
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    Quote Originally Posted by sm31 View Post
    Tried this method but gave up when my dick got caught in the ceiling fan...
    That’s because you got excited while doing it.


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  6. #226
    Old Timer USMC Wrangler's Avatar
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    Cooper Discoverer STT Pro’s 315/70R17, 30 psi with about 300 feet driven = 33.25”

    IMG_7471.jpg
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  7. #227
    Been Around the Block sm31's Avatar
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    Pro Comp Xtreme MT2 35" x 12.50" x 17, on 17" x 9" wheels. About 800 miles...

    33 5/16's.
    Attached Images Attached Images

  8. #228
    Been Around the Block bhaner's Avatar
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    Pro Comp Xtreme MT2 40x13.5R17

    38.5" @ 30 PSI with 0 miles.
    Byron Haner - Wickersham, Wa
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  9. #229
    Fresh Catch josefraul's Avatar
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    Firestone Destination MT 2 33” 12.50 R17
    Actual 32” newIMG_6342.jpg


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  10. #230
    Fresh Catch
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    So I’m prepared to get blasted on here for asking questions. So here goes lol. Read every post, so if I wanted a “true” 35 based on this forum I should get a 37? Say for example the cooper STT Pro’s. I look forward to the replies.

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