Post up your "big wheeled" cars...AKA...17's or larger AND ADD YOUR BACKSPACING INFO!!!!!

Discussion in 'Suspension, Steering, Brake & Wheel Topics' started by CarNDrvr, Mar 9, 2009.

  1. dutch73camaro

    dutch73camaro Veteran Member

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  2. GoldenOne7710

    GoldenOne7710 Equal Opportunity Offender Lifetime Gold Member

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    If the car in your avatar is your car with those wheels...I can see how it would work. You have your sitting a little higher in the rear, giving clearance so your tires have more room.

    Lots of us are trending towards the pro-tour look where the car sits low all the way around and wheels tuck in the rear....where 4.25 inch backspacing wouldn't work with a 10" wide wheel....not without modifying the fender lip. Yours is probably exactly what your specs sheets say it is.
     
  3. SPG

    SPG Bumblebee Builder

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    yup, whats in my picture is what I'm using, the car use to have 1" lowering blocks, an extra ghetto mounted leaf and the tires rubbed, I had to remove them to go back to stock ride height to fix the issue. I had to roll my fenders though.
     
  4. mrfleet12

    mrfleet12 Veteran Member

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    Thought I'd put this on here previously but can't see that I did..
    US Mags Rambler U121
    18 x 8 - 4.5 245 - 40 - 18
    18 x 9.5 - 5.5 275 - 40 - 18

    IMG_20191004_174138.jpg IMG_20191004_174151.jpg
     
  5. Anthony Burgos

    Anthony Burgos New Member

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    You state if you went went with 40's in the rear next time.....if you DID go with 40's in the rear, would that backspacing have changed on the wheel? or fender contact with tire? Thanks
     
  6. 70ZED

    70ZED Veteran Member Gold Member

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    Thanks for that !
    [​IMG]



    ESR SR12s:

    F: 18"x9.5" / +22mm/6.11" - 12mm/.47" spacer = 5.64" effective backspace / 275/35R18
    R: 18"x10.5" / +22mm/6.61"- 20mm/.79" spacer = 5.82" effective backspace / 315/30R18

    Haven't driven the car, but see this thread for similar specs. I haven't put any camber in the front yet, but will do -1* or -1.5*, and it should clear fine even after I lower it a bit (and use button-head Torx bolts for inner fender). I cut the inner lip off and slightly flared the rear wheel openings - the rear will settle a bit more once the car is complete and after some time as the (PTFB Comp) leafs are brand new.

    I really wanted 315 out back. Worst case, I'll move the fronts to the rear and get 8.5" / 245 or 255 for the front, which should fit no worries at all, even slammed.[/QUOTE]
     
    $ Mike 70 Z-28 likes this.
  7. Rayden2009

    Rayden2009 Veteran Member Gold Member

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    Backspacing won't change. The tire will be a little taller. I know of people running 275/18/40 with a 5.75” BS with no issues. 285/18/40 will be a little more risky, but I hear its being done too. 5.75” BS on a 10” rim seems to be the sweet spot.
     
  8. 8pack

    8pack Veteran Member Lifetime Gold Member

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    You really have to be careful. I am sure that generally you are right, but:

    • Are you running a stock rear end
    • Is the rear perfectly centered or slightly offset which is common. This will result in rubbli g on one side but not the other.
    • Are you running an e-brake. Stock drums or discs? On aftermarket calipers? TA Disc brakes?
    • How much is the car lowered which is a big variable.

    Just saying that you really can't go by anyone one person's experience or even groups if people unless you know you have exactly the same set up otherwise you will run into issues.

    BTW, I do agree a 275 tire should be no problem but I think the 5.75 backspace will give some people trouble on the inboard side with certain e-brake set ups and 5.5" is a safer bet but you could wind up with an outboard issue if your rear is not centered.
     
    dave@ztech likes this.

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