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offset and backspacing bugging me.

Discussion in 'Wheels & Tires' started by alexlies, Jun 3, 2010.

  1. Jun 3, 2010 at 8:26 PM
    #1
    alexlies

    alexlies [OP] Well-Known Member

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    ok im havin a hard time understandin what i need. so heres what im getting im getting a 15x8 rim with 33.12.50 tire on my 2002 tacoma what backspacing do i need to make this work with ease. would the 15x8 be a little narrow? for the 12.50? maybe `15X10?
     
  2. Jun 4, 2010 at 4:27 AM
    #2
    TacoSupreem

    TacoSupreem Dirty Trucker

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    Check with the tire manufacturer to see what the recomended rim width is for the tire your wanting. As far as backspace I believe 4-4.5" should work but I'm not certain?
     
  3. Jun 4, 2010 at 10:16 PM
    #3
    chad68

    chad68 Master Jedi Member I am...

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    An 8" rim is not the "ideal" size for a 12.5 tire and some manufactures won't recommend that size tire on a 8" wheel, to the point it won't be listed on their sizing spec charts. Some manufactures do say you can run a 12.5 on an 8" wheel, so it's borderline to say the least. If anything else you won't have a nice flat contact patch with a wide tire on a narrow rim and the center of the tires will wear down faster than the edge, unless maybe you run really low PSI, which will wear everything down fast.

    I would use a 9" wide wheel for a 12.5 wide tire. You could also use a 10" wheel but a 9" would be more ideal.

    As far as backspacing I don't know since I have a gen2. With a 9" wide wheel and a 12.5x33 tire, I would guess that a 4.5" BS should work, at least on a gen2.

    On a gen 2 if i was to try to stuff a 12.5 on my 16x8" 4.0" BS wheels, I supposdley have the right backspacing to do so, since the sidewall would buldge out more than if it were on a 9" wheel.

    Yer probablly more confused than before? LOL
     
  4. Jun 13, 2010 at 9:53 AM
    #4
    alexlies

    alexlies [OP] Well-Known Member

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    no i get it thanks for your help i think im gonna go with a 17x8 with 285/70
    4.5 backspace
     
  5. Jun 13, 2010 at 10:10 AM
    #5
    mikesdoublecab

    mikesdoublecab LT Chase Truck

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    Alex, 4.5" backspace may have clearance issues on a first gen, especially if you ever air down to offroad...

    your stock backspace is 4.5" and throwing on a 285, the sidewall of tire may rub up against the stock upper control arm, and may rub on the frame at full turn...

    when turning into a driveway, you may also hear the tread rub up on the pinch weld...

    if upsizing your wheel and tire, i would consider going into a 4" or 4.25" backspace...
     
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