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sacmarata's avatar
sacmarata
Explorer
Jun 20, 2014

Tire size chart

Thought this may be useful to some here. This is not a comprehensive list.

The following is calculated at 700lbs per rim inch (industry standard)


TIRE SIZE.....CROSS SECTION INCHES.....TTL LBS per axle

7.5 R 16.0 LT - 7.5 - 10,500lbs
8.75 R 16.5 LT - 8.75 - 12,250
9.5 R 16.5 LT - 9.5 - 13,300

LT 225/75R 16 - 8.8582677 - 12,402lbs
LT 245/75 R 16 - 9.6456693 - 13,504
LT 215/85 R 16 - 8.4645669 - 11,850
LT 235/85 R 16 - 9.2519685 - 12,953
215/75 R 17.5 - 8.4645669 - 11,850
225/70 R 19.5 - 8.8582677 - 12,402
245/70 R 19.5 - 9.6456693 - 13,504
265/70 R 19.5 - 10.433070 - 14,606
255/70 R 22.5 - 10.039370 - 14,055
245/70 R 22.5 - 9.6456693 - 13,504
265/75 R 22.5 - 10.433070 - 14,606
295/75 R 22.5 - 11.614173 - 16,260
295/80 R 22.5 - 11.614173 - 16,260
285/75 R 24.5 - 11.220472 - 15,709
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Jun 20, 2014
    Very confusing, to me anyway. Does that say that 2 LT 235/85 R 16 tires will carry 12,953 lbs.? Or am I missing something very obvious?
  • i_Corky's avatar
    i_Corky
    Explorer
    Jun 20, 2014
    On my sticker inside the drivers door, it shows my GVWR of 12,210, tires: front & dual rears as LT225/75R16D. The GAWR: front 4400 & rear 7810. I don't know what it all means.
  • BarneyS's avatar
    BarneyS
    Explorer III
    Jun 21, 2014
    fj12ryder wrote:
    How many tires on that axle? What does TTL LBS per axle mean?

    Probably "Total Pounds per Axle".
    Barney
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Jun 21, 2014
    I figured that's what it meant, but what does that mean? Wouldn't it be dependent on the number of tires on that axle? What am I missing?
  • sacmarata's avatar
    sacmarata
    Explorer
    Jul 07, 2014
    fj12ryder wrote:
    I figured that's what it meant, but what does that mean? Wouldn't it be dependent on the number of tires on that axle? What am I missing?


    Values are for two tires per axle.
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Jul 07, 2014
    That still makes no sense since it shows:

    LT 235/85 R 16 - 9.2519685 - 12,953

    If that is for 2 tires/axle then it shows that those 2 tires can handle 6476.5 lbs. each. I don't think so!! So far that chart is meaningless.
  • blt2ski's avatar
    blt2ski
    Moderator
    Jul 07, 2014
    What I believe the OP is trying to say, ie how much a DOT/SP officer will enforce a typical tire max. I'm personally not willing to believe this, per the local SP/DOT officers I have had to deal with. The 235 tire as mentioned, is 9.25" wide, but I get a max of 500 lbs per inch of tire if a single, and 600 if a dual, so 9250 on a single tire axel, or 22200 lbs, which would be lowered to the max per axel of 20K. Tire max in washington state does not matter, only the Federeal bridge law stds. which is the 500 or 600 lbs per our state law modified.

    If it is 700 lb per inch of rim, then a 235 typically has a 6-6.5" rim, or about 4200-4500 per tire, or numbers on par with my quote of 9250 per axel or a bit lower.

    I would not trust the above chart to be a legal amount under NO circumstances that I have had to deal with when dealing with commercial enforcement officers and max tire/axel amounts.

    Marty
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Jul 07, 2014
    Thank you Mod for the enlightenment. Your explanation makes sense. Thanks again.

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