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Backspacing, running me crazy

Discussion in '2nd Gen. Tacomas (2005-2015)' started by JW150, Dec 3, 2009.

  1. Dec 3, 2009 at 8:40 AM
    #1
    JW150

    JW150 [OP] New Member

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    Anybody no the stock backspacing and offset on 2009 TRD sport double cab, what would be the best to backspacing and offset to get on the new wheels? Anybody know if a wider size wheel would work? I don't know any help would be appreciated. Thanks
     
  2. Dec 3, 2009 at 8:44 AM
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    Dark Knight

    Dark Knight Well-Known Member

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    stock sport wheels are 5.5"bs

    get a 4.5" bs with low negative offset. 8" wide
     
  3. Dec 3, 2009 at 8:46 AM
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    08pretaco

    08pretaco Almost there

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    can you help me unstand why running bs wheels other than factory is bad please?
     
  4. Dec 3, 2009 at 8:48 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It isn't bad.
     
  5. Dec 3, 2009 at 8:55 AM
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    Dark Knight

    Dark Knight Well-Known Member

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    ^^ x2. backspacing and offset come into play to fit larger/smaller tires correctly.
     
  6. Dec 3, 2009 at 9:04 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Here is a good site to help explain how BS and offset are derived.

    https://www.rsracing.com/tech-wheel.html

    The smaller the BS number (ie: 3.5", 4" vs. 5" or 5.5") the further out (meaning away from the suspension) the wheel will be.
     
  7. Dec 3, 2009 at 9:05 AM
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    08pretaco

    08pretaco Almost there

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    I got that answer from another post btw, the arguement was that spacers are just as bad as running bs wheels. i didnt think it was thats why i asked the question
     
  8. Dec 3, 2009 at 9:07 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    There are many members here running spacers that would contradict that argument. Good question regardless. :D
     
  9. Dec 3, 2009 at 9:08 AM
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    Dark Knight

    Dark Knight Well-Known Member

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    I had no problems with my spidertrax spacers when I had them and I dont think Derek has had any now that he's running them.
     
  10. Dec 3, 2009 at 9:11 AM
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    Yoytoda

    Yoytoda The Little Truck That Could

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    The stock design it to keep the center of the wheel is directly over the center of the wheel bearing. If you run too small of a back spacing you put the center of the wheel further away from the center of the wheel bearing. Wheel bearings are ball bearings which are designed to hold weight straight on it. with wheels further out there is axial leverage put on the bearing causing them to wear faster than they should. They also cause the ball joints to wear faster because of the extra leverage. 4.5" of back spacing on a 8" wide rim is fine. The rear axle bearings are designed different and are less sensitive to back spacing strains.

    My experience was with a 16x9 with a 4" backspacing with 315/75-16s on a 1/2t chevy avalanche and i had to replace the wheel bearings every oil change...ok maybe not that often but at least every year...
     
  11. Dec 3, 2009 at 9:14 AM
    #11
    08pretaco

    08pretaco Almost there

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    interesting^. what are the sizes of the majority you think that run aftermarket wheel, 4.5 bs on 8" rim? thats seems,from what you wrote, to not be any worse that running stock wheels. so in that case it isnt bad to run bs but divert from that too much, and the more you go the worse it gets?
     
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