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I need some help on wheel back spacing and offset please.

Discussion in 'Wheels & Tires' started by Trace, Mar 7, 2012.

  1. Mar 7, 2012 at 1:44 PM
    #1
    Trace

    Trace [OP] Active Member

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    08 Tacoma 3 inch lift sr5
    3 inch pro comp lift.
    I have an 08 taco with a 3" pro comp lift. I want to put 33x12.5 r18's with 18x9 wheels. I found the ones I want but I don't know what backspacing and offset I need. Any info would help. Thanks.
     
  2. Mar 7, 2012 at 2:33 PM
    #2
    KPT

    KPT sees what you did there.

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    4.5" backspacing and then get ready to trim.
     
  3. Mar 7, 2012 at 3:56 PM
    #3
    Trace

    Trace [OP] Active Member

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    What would I have to trim?
     
  4. Mar 7, 2012 at 7:00 PM
    #4
    KPT

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    Lots of fender well plastic, and you will likely have to chop and rebox your cab mounts
     
  5. Mar 8, 2012 at 1:47 PM
    #5
    Trace

    Trace [OP] Active Member

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    Why would I have to trim? Is it because of the with or the height?
     
  6. Mar 8, 2012 at 1:54 PM
    #6
    4Wheelin4Banger

    4Wheelin4Banger Longtime Toyman

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    3" OME lift 885s & Dakars riding on 33" KM2s Click the sig pic to see the build thread .
    Width. I'm running the skinny 33" tires (255/85/16 on 1st Gen TRD ORs {4.5" BS}) and haven't trimmed anything.
     
  7. Mar 8, 2012 at 3:11 PM
    #7
    Trace

    Trace [OP] Active Member

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    How wide can go without trimming With 3.5 backspace?
     
  8. Mar 8, 2012 at 5:05 PM
    #8
    KPT

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    3.5 bs and you wouldn't even be ale to fit 265s. It woud increase the turning arc too much. 4.5 is your best bet.
     
  9. Mar 8, 2012 at 5:39 PM
    #9
    rossivey

    rossivey Well-Known Member

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    i just put some 285/70/17s on w/ a 3" OME Lift & i'm had to trim some fender and going to do the cab mount chop. My offset is -12mm but i dont know what backspacing i have off the top of my head. i'm thinking 4.5" though.
     
  10. Mar 8, 2012 at 6:24 PM
    #10
    Trace

    Trace [OP] Active Member

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    What's the widest tire I can run with out trimming. The wheel I have it a 18x9 with a 24mm offset. So it's about a 3.5 bs.
     
  11. Mar 8, 2012 at 6:28 PM
    #11
    KPT

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    Return the wheel or get ready to cut your fenders. The metal portion, not the plastic well. 3.5"s aren't designed for these trucks.
     
  12. Mar 8, 2012 at 6:30 PM
    #12
    KPT

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    You might be able to barely pull it off with 265/65/18s and a lot of trimming, but that's a far cry from the super wide tires you wanted
     
  13. Mar 8, 2012 at 6:54 PM
    #13
    Trace

    Trace [OP] Active Member

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    I do have a arb front bumper. What is the perfect tire width and wheel backspacing so I don't have to trim my cab mounts. Remember I have a 3" lift.
     
  14. Mar 9, 2012 at 5:58 AM
    #14
    rossivey

    rossivey Well-Known Member

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    probably 265/75/16 on a 16x8 wheels with 4.5" backspacing. Anything larger than 265 is gonna push the limit of needing to trim so fender. i've heard some guys running 275s with no rubbing but that usually depends on the type of tire and how aggressive it is.
     
  15. Mar 9, 2012 at 6:00 AM
    #15
    KPT

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    Yep, this^^^

    Arb bumper doesn't solve anything. They aren't designed for fitting larger tires.
     
  16. Mar 9, 2012 at 7:07 AM
    #16
    Trace

    Trace [OP] Active Member

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    So I can't get anything wider that a 10.5 in tire huh. But if I put that size on an 18x8 wheel it would make a 265/75r18 a 33.5ish x 10.5ish correct? And do you think that would work and look good with a 4.5bs wheel?
     
  17. Mar 9, 2012 at 1:50 PM
    #17
    rossivey

    rossivey Well-Known Member

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    If u get a 33.5" tire, you're gonna need to trim a lot. I don't think 265 is a 33" tire but I could be wrong. I'd need to do some more research.
     
  18. Mar 9, 2012 at 3:51 PM
    #18
    4Wheelin4Banger

    4Wheelin4Banger Longtime Toyman

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    They are.
    Current Tire Size: / R
    New Tire Size: / R
    Your Calcs (x): 265 / 75-16 - 265 / 75-18265 / 75-16 - 275 / 70-16

    [​IMG]
    Side by side Overlay
    [​IMG]
    Diameter inches 31.65 33.65

    http://www.tacomaworld.com/forum/tirecalc.php
     
  19. Mar 10, 2012 at 7:09 AM
    #19
    rossivey

    rossivey Well-Known Member

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    Nice work!
     
  20. Mar 12, 2012 at 12:10 PM
    #20
    Trace

    Trace [OP] Active Member

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    3 inch pro comp lift.
    Ok I'm going down to a 17" wheel with a 4.5 bs. Whats the the tallest and widest it can go with a 3" lift without trimming anything.
     
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