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Thread: Backspacing, offset and tire sizes explained

  1. #46
    Senior Member ir1d3d1rt's Avatar
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    Quote Originally Posted by s10blaza View Post
    yup. I have +35mm on mine and its a 2wd, BDed and its dead on. I tried on a friends 20x9 +20mm and it hit horrible.
    is the +35 on a 8.5 and did you run spacers?
    it would be easier with more money.

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  2. #47
    Search Button Mod BlazerINtheWork's Avatar
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    Quote Originally Posted by FabianSS357 View Post
    15mm = .59inches so you add that to your 4.5 and you get a total of 5.09 inches of backspace

    help me out with this right here.


    i just went and measured the backspacing of a 15x10 rim that i have and it is about 5''. so that means it is 4.5'' bs? so on a 2wd rearend that would sit in an inch in to much right? i remember a 10'' wide rim for our trucks needing 5.5 bs.

    right?
    Last edited by BlazerINtheWork; 05-09-2007 at 07:54 PM.
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  3. #48
    Registered User FabianSS357's Avatar
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    Quote Originally Posted by BlazerINtheWork View Post
    help me out with this right here.


    i just went and measured the backspacing of a 15x10 rim that i have and it is about 5''. so that means it is 4.5'' bs? so on a 2wd rearend that would sit in an inch in to much right? i remember a 10'' wide rim for our trucks needing 5.5 bs.

    right?

    ok Kyle, backspacing is backspacing.... no matter what. if you measure the distance from the pad to the outer lip that is your backspacing. So if you measured 5 inches that is your Bs. with your 15X10s if you have an exact 5 " bs that means you have 6" of rim left in front of your axle. so if you measure 6" from your mounting point on the axle that is where your rim lip is going to be.

    remember 10 wide rim, means its actually 11" total width (see my first few posts) so if you have 5" inches out back you have 6 left in front. ideally your right you want 5.5 so that you have 5.5 in front too. and the rim is centered on the fender (given that the axle mounting point is dead center) You on the other hand have a 5 and 6 combo so watch out for that 6" front spacing if your too low cause im willing to bet that bitch will rub fender lip.
    Hit me up tomorrow afternoon about 8 central standerd on AIM if you need some help.
    Last edited by FabianSS357; 05-09-2007 at 10:21 PM.
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  4. #49
    Search Button Mod BlazerINtheWork's Avatar
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    i think i got it, thanks fab, big help man.


    just to make sure, the other .5'' is going to make it sit out more, and not in right? if so thats perfect for me since its just a drag only wheel and will prolly have a low psi tire.


    thanks again :D

    edit, nevermind, lol. went and remeasured and i am positive it is 5.5 BS, that worked out better than planned.
    Last edited by BlazerINtheWork; 05-09-2007 at 10:45 PM. Reason: becuase i cannot operate a frickin tape measure, lol
    Originally posted by Baggd2DaXtreeme
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  5. #50
    Registered User FabianSS357's Avatar
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    Quote Originally Posted by BlazerINtheWork View Post
    i think i got it, thanks fab, big help man.


    just to make sure, the other .5'' is going to make it sit out more, and not in right? if so thats perfect for me since its just a drag only wheel and will prolly have a low psi tire.


    thanks again :D

    edit, nevermind, lol. went and remeasured and i am positive it is 5.5 BS, that worked out better than planned.
    Correcto Brotha
    that extra .5 will add to your fender edge, making your rim stick out .5 further then a 5.5 rim. glad you got wnat you need.

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  6. #51
    License and Registration? RustyButTrusty's Avatar
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    Would a 16x8 w/5" of backspacing and a +12mm offset work on a 2wd?
    Originally posted by s10blaza
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  7. #52
    Registered User bubblegum816's Avatar
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    how will eagle allloy 077s fit on a 2wd 87 s10 blazer with hydros:eek:
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  8. #53
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    hi

    hi all i am new to chev s-10 and im not fully understanding the offset/back space could someone let me know if i would waste my money buying theses rims thanks.

    2001 chev s-10 side step ext cab 2wd

    looking to buy:

    billet specialties wheels model "Fastlane"

    18''X8" and two of them have 4.0'' B.S. and the other 2 have 5.25" B.S.
    the Bolt pattern is 5 on 4.75",

    come with a set of BFG Scorcher T/A's. the tires have about 5,000 Km on them so there is alot of tread left and the size of the tires is 225/40ZR18


    what im not sure about is the 2 with 5.25 bs , will theses fit on the rear?

    the front 4.0 bs= aprox 0 offset which are perfect correct?



    thanks for the help!

  9. #54
    Registered User wagonmaster's Avatar
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    Weird, why the different backspacings?
    Anyway, since all four wheels are the same widths you don't want different backspacings. You won't be able to rotate your tires, it will cause some strange handling issues, looks funky, and putting that backspacing on the rear will cause a fender gap of three inches at least and look stupid...
    Plus, the tire size is too small.

    Yes, you want zero offset. However, backspace is measured to the outside edge of the rim, so the BS for an 8" wide wheel is actually about 4.5".

    Last edited by wagonmaster; 10-25-2010 at 06:38 PM.

  10. #55
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    there on kijiji and was looking on buying them but was wondering the same thing on the offsets and different backspace, but before i went and grabbed em wanted to make sure didnt waste my coin but had feeling i would be, thanks for reply, guess ill keep looking , got all winter anyways :)

    i guess either the guy who got them or ordered them someone buggered up some where dunno lolz



    so if i want to stick with 18" rims whats the best rim size/set up and tires i should look for or order?

  11. #56
    Registered User wagonmaster's Avatar
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    I'm running 18x8, 0 offset, 4.5 BS. I have 245/45-18 tires. My truck is lowered 4" front, 5.5" rear. Rears clear easily, fronts barely rub at full lock. It's the one in my avatar.

    Have you done any suspension stuff to your truck? Or is it stock height?

  12. #57
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    its all stock at the moment, thanks for the help.

  13. #58
    LS1/9 inch curry rear end blazingrip's Avatar
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    Just to make sure but I think this rim combo will work. My first gen is lowered 4". I'm looking at 20" x 8.5" in the front at 0 offset and 20" x 10" in the back with +18 offset. If someone wouldn't mind confirming or not that would be great thanks

  14. #59
    Registered User wagonmaster's Avatar
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    Sounds right.
    A 245/35-20 on the front should clear, might have a tiny bit of stretch.
    285/30-20 for the rear.
    Pics when you get it done.

  15. #60
    LS1/9 inch curry rear end blazingrip's Avatar
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    Sweet thanks for the quick reply and for the tire sizes. I'll post pics when they are on.

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