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Thread: Tire diam.

  1. #1

    Default Tire diam.

    While at randy's ring and pinion site I used the rpm calc they have on there.
    Whould it be better to park the truck on concrete and measure from the center of the hub down and double it for the tire size? It just seems tires are smaller than labeled.

  2. #2
    Join Date
    Sep 1998
    Location
    North Central Wisconsin
    Posts
    11,520

    Default

    Its very common for tires to be listed at a certain size but really be shorter...many 38's run 36.8 to 37.5 inches tall...some even run less than the 36.8 height...

    Dont ask me how they get away with that...
    Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.

    Pro-choice, that's a LIE, babies don't choose to die!!

  3. #3
    Join Date
    Dec 2006
    Location
    Lake Hopatcong, NJ
    Posts
    32

    Default

    Yes, it would be more accurate to use two times the static loaded radius as your tire diameter in rpm/gear ratio calculations. Make sure the tires are inflated to the pressure that you plan to run them.

  4. #4

    Default

    Rim width etc has an effect on the height... but yeah, Interco in particular is known for running short.

    Boondockster, good post-- that is excellent advice.

  5. #5

    Default

    Yeah, Interco sucks. Poor quality, poor design and horribly over priced for what you get.

  6. #6

    Default

    Easy now. Their designs work. I'll get some 47" LTB's sometime I think. Stickier than Michelins, and those stupid-ass Claws too.

  7. #7
    Join Date
    Dec 2003
    Location
    West-central Ohio
    Posts
    689

    Default

    Quote Originally Posted by tacoma View Post
    Rim width etc has an effect on the height... but yeah, Interco in particular is known for running short.

    Boondockster, good post-- that is excellent advice.
    Yes, boondocker is spot on. Tire growth at speed is something folks not in the realm of M715s should consider, but we're pretty much immune from that.
    "other peoples junk, is something or other" - Militarypotts 02/07/2011

  8. #8

    Default

    most things that operate at highway speeds are, I'd say.

  9. #9
    Join Date
    Dec 2006
    Location
    Lake Hopatcong, NJ
    Posts
    32

    Default

    Funny you mention that bump_r! I almost added a caveat for centrifugal force but realized it's not an issue for most M715's

    Either way, it is better than using the number on the sidewall.

  10. #10
    Join Date
    Dec 2006
    Location
    Lake Hopatcong, NJ
    Posts
    32

    Default

    Thanks Tacoma! I'm new here and I'll try to be a good poster.

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