Page 2 of 5 FirstFirst 1234 ... LastLast
Results 16 to 30 of 63

Thread: Backspacing, offset and tire sizes explained

  1. #16
    Double Bagged s10blaza's Avatar
    Join Date
    Mar 2003
    Location
    El Paso, TX
    Posts
    5,951
    here's a funny one. I borrowed a 20x9 rim with 5.5" of backspacing and it clears BARELY. I can slide a couple sheets of paper in between the tire and the quarter panel. Im going to order the 8.5s in the same backspace and see how it went.

  2. #17
    Senior Member ir1d3d1rt's Avatar
    Join Date
    Sep 2005
    Location
    Puyallup/Yakima, Washington
    Posts
    831
    let us know because i found some 20x8.5 with 5.5 backspacing that i really liked.
    it would be easier with more money.

    my project thread

  3. #18
    ZQ8 Jimmy 92Jimmy's Avatar
    Join Date
    Dec 2005
    Location
    Monroe, NC
    Posts
    944
    I know I keep pulling up old posts but, for the guy who wanted to run the 20" with the 8.5 backspace and only had a few MM worth of room between the quarter and the tire. You might want to think about the fact that tires balloon and swell with heat and rotation so if you drive on a tire that will barely rub when it's sitting then when the tire heats up and expands it will eventually rub and "flake" the rubber off the tread of the tire. Just my .02 worth...
    85' Jimmy 2Dr 2WD Blown 2.8L*Sold*
    88' S-10 2Dr 2WD Blown 2.5L *Sold*
    88' Jimmy 2Dr 2WD R Code 2.8L *Daily Project*
    89' Jimmy 2dr 2WD Z Code 4.3L TBI *Parts Truck*
    92' Jimmy 4Dr 2WD W Code 4.3L Vortec *Sold*

    Quote Originally Posted by FeTTo View Post
    please tell me you just took your stupid pill before posting that :evil: :evil: :evil: :evil:

  4. #19
    !! Built Not Bought !! bagme_85's Avatar
    Join Date
    Feb 2004
    Location
    Warrenton Mo
    Posts
    773
    cool thats a good thing to know.
    ***im back bitchez time to shine up the underside of some frames... asphalt style***

  5. #20
    Registered User FabianSS357's Avatar
    Join Date
    May 2004
    Location
    Near Houston
    Posts
    1,968
    Originally posted by 85Jimmy
    I know I keep pulling up old posts but, for the guy who wanted to run the 20" with the 8.5 backspace and only had a few MM worth of room between the quarter and the tire. You might want to think about the fact that tires balloon and swell with heat and rotation so if you drive on a tire that will barely rub when it's sitting then when the tire heats up and expands it will eventually rub and "flake" the rubber off the tread of the tire. Just my .02 worth...
    I think hector ran those wheels and is now fully bagged with no problems.

    I dont think anyone would run a setup that allowed only a few mm to clear for safety reasons, let alone leave a small enough gap that would close up as the wheel "swelled" as you call it.

    and not many drive 70+ with the front/rear all the way down for a long period of time anyhow.

    Heres a very dimunitive update to the thread as well.

    If you are a few mm from clearing a specific wheel many better wheel shops will be able to shave a bit off the mounting area of most wheels. Its not very costly and allows you to run your selected wheel with no problems.
    Superbee is a Flaming homosexual!
    A firm believer that women are physcotic.

  6. #21
    Eagles JPMasters1107's Avatar
    Join Date
    Jan 2003
    Location
    Philadelphia
    Posts
    1,277
    the wheels im getting are 20x8.5 with 5" backspaceing and +6mm offset. do you guys think they will rub or anything, i plan on bagging my truck this summer.

  7. #22
    ZQ8 Jimmy 92Jimmy's Avatar
    Join Date
    Dec 2005
    Location
    Monroe, NC
    Posts
    944
    Originally posted by FabianSS357
    I dont think anyone would run a setup that allowed only a few mm to clear for safety reasons, let alone leave a small enough gap that would close up as the wheel "swelled" as you call it.

    and not many drive 70+ with the front/rear all the way down for a long period of time anyhow.

    The only thing I can say to that: There are people like that in this world. Don't doubt that for a second.....

    Plus, even if you drove with the front/ rear up, the tire still expands with the friction between the contact patch and the road. Therefor, when you let it down again to cruise, it would rub the fenderwell untill it gradually lost the heat and shrank back to it's normal size under slower driving conditions.
    85' Jimmy 2Dr 2WD Blown 2.8L*Sold*
    88' S-10 2Dr 2WD Blown 2.5L *Sold*
    88' Jimmy 2Dr 2WD R Code 2.8L *Daily Project*
    89' Jimmy 2dr 2WD Z Code 4.3L TBI *Parts Truck*
    92' Jimmy 4Dr 2WD W Code 4.3L Vortec *Sold*

    Quote Originally Posted by FeTTo View Post
    please tell me you just took your stupid pill before posting that :evil: :evil: :evil: :evil:

  8. #23
    Double Bagged s10blaza's Avatar
    Join Date
    Mar 2003
    Location
    El Paso, TX
    Posts
    5,951
    I spent night after night after night doing research and reading and measuring before finally placing that order. I guess I did something right because now I can stick my hand between the tire and the quarter panel and I'm still about 3/4" away from the 4-link bars. I ended up going with a +35mm offset.

    Thanks for the concern though about the sidewall, I did run into that a few times when searching through old posts on various forums

  9. #24
    Registered User ZZ4Blazer's Avatar
    Join Date
    Dec 2001
    Location
    Akron, Ohio
    Posts
    6,226
    Originally posted by JPMasters1107
    the wheels im getting are 20x8.5 with 5" backspaceing and +6mm offset. do you guys think they will rub or anything, i plan on bagging my truck this summer.
    Gonna rub on the frame and possibly the sway bar on turns.
    Jim 94 Stepside
    ZZ430 clone V8
    NX kit in the works
    Tremec T56 6 speed
    8.5" rear
    Quote Originally Posted by Harley
    Go before show any day of the week.

  10. #25
    Eagles JPMasters1107's Avatar
    Join Date
    Jan 2003
    Location
    Philadelphia
    Posts
    1,277
    Originally posted by ZZ4Blazer
    Gonna rub on the frame and possibly the sway bar on turns.
    is it the backspacing or the offset that is too much??

  11. #26
    Double Bagged s10blaza's Avatar
    Join Date
    Mar 2003
    Location
    El Paso, TX
    Posts
    5,951
    Originally posted by JPMasters1107
    is it the backspacing or the offset that is too much??
    More like not enough, look for something closer to a +14mm offset

  12. #27
    Eagles JPMasters1107's Avatar
    Join Date
    Jan 2003
    Location
    Philadelphia
    Posts
    1,277
    will do, thanks alot...but i thought 2wd needed a smaller offset then 4wd, i always thought a 15mm offset was 4wd.
    Last edited by JPMasters1107; 11-28-2006 at 11:31 AM.

  13. #28
    Registered User ZZ4Blazer's Avatar
    Join Date
    Dec 2001
    Location
    Akron, Ohio
    Posts
    6,226
    Originally posted by s10blaza
    More like not enough, look for something closer to a +14mm offset
    Um no. 14MM offset on an 8.5" wheel would have just over 5 1/4" BS. That is way too much on a 2wd. For the front, on an 8.5" wheel zero offset would probably be the best. Thatd be 4.75" BS.

    Having a wider wheel like that, and being bagged, your gonna have some rubbing. No way around that.
    Jim 94 Stepside
    ZZ430 clone V8
    NX kit in the works
    Tremec T56 6 speed
    8.5" rear
    Quote Originally Posted by Harley
    Go before show any day of the week.

  14. #29
    Eagles JPMasters1107's Avatar
    Join Date
    Jan 2003
    Location
    Philadelphia
    Posts
    1,277
    Originally posted by ZZ4Blazer
    Um no. 14MM offset on an 8.5" wheel would have just over 5 1/4" BS. That is way too much on a 2wd. For the front, on an 8.5" wheel zero offset would probably be the best. Thatd be 4.75" BS.

    Having a wider wheel like that, and being bagged, your gonna have some rubbing. No way around that.

    thanks jim, i dont know much about wheels but i knew 14mm offset was more like 4wd. i guess i will look for a 8" wheel with like a 0-3MM offset.

  15. #30
    Registered User
    Join Date
    May 2002
    Location
    SC
    Posts
    206
    good information, im still left a little confused. Like above, i was under the impression that a +15mm offset is for a 4x4 and the lower the better for a 2wd. Im about to go from 20x9s to preferably 22x8 but probably 9 or 9.5 width wise with a +15mm. sound right?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •