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are the size actually right on tires

Discussion in 'The Garage' started by socalsnake, Dec 11, 2005.

  1. socalsnake

    socalsnake 1/2 ton status

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    are the size of the super swampers actually the right size 38 38.5
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Most tires are physically smaller than the stated size on the tire. There are several factors which change the size such as rim width, and air pressure and vehicle weight. The biggest factor is rim width but usually the tire manufacturer list what rim width was used to determine that tire diameter but even then they usually run small.
     
  3. muddybuddy

    muddybuddy 3/4 ton status

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    swampers usually run the truest out of them all. my 35x12.50 bfg's measure out to 34" on 10" rim
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The most accurate way to determine how true the size is is to measure the circumference and divide that number by pi (3.141)

    My 39.5's are 123.5" around, (39.32" diameter) static height is less though. Closer to 38.5" with 19 psi. At 45 psi they'd prolly be 39.25", but that exceeds max recomended air pressure and isn't practical...

    Rene
     
  5. socalsnake

    socalsnake 1/2 ton status

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    ok

    but what if i get 38 will there be the exact height i have a 6 inch pro comp/atlas leaf springs im runnin right now 17/40/15LT gumbo mudders but im looking to get 38 or 38.5 an like i said about the size cuz someone said that the super swampers are exact height an size
     
  6. muddybuddy

    muddybuddy 3/4 ton status

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    swampers are the closest i think to being true.
     
  7. erik59

    erik59 Registered Member

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    Just check out the tire manufacturers website. They have all the info that you are looking for.

    Erik
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A 38.5 on the truck and at the correct air pressure should be in the 37.5-38" 'height'. The bottom of the tire is going to have a slightly flatter part, this is the contact patch and is why the height of the tire often falls short of advertised.

    As far as I've heard those Gumbo Mudders run small too.

    Rene
     
  9. socalsnake

    socalsnake 1/2 ton status

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    so basically if i want to get a 38 i should get a 38.5 i just still want atleast a big decent tire
     

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