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285's with 4" backspace Side Pics please!!

Discussion in 'Wheels & Tires' started by Gage, Apr 9, 2012.

  1. Apr 9, 2012 at 2:47 PM
    #1
    Gage

    Gage [OP] Active Member

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    I'd like to see some pics of 285's mounted on wheels with 4" of backspace. I know they will fit but I want to see how much they stick out past the wheel well. Pics of First Gen trucks are preferred

    I prefer the look of 255 85R16's but don't want a mud Terrain tire which pretty much rules out that size.
     
  2. Apr 9, 2012 at 3:10 PM
    #2
    masshole taco

    masshole taco Well-Known Member

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    I got them on a 2nd gen but if you want pics of that let me know..
     
  3. Apr 9, 2012 at 4:48 PM
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    KPT

    KPT sees what you did there.

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    That 4" bs is actually going to be cutting it a bit close for a first gen I believe. Stock is 4.5"
     
  4. Apr 9, 2012 at 4:49 PM
    #4
    08pretaco

    08pretaco Almost there

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    You mentioned no mud terrain which is fine, Cooper ST is an all terrain and they sell in 255/85.
     
  5. Apr 9, 2012 at 4:55 PM
    #5
    JDMcQ

    JDMcQ Well-Known Member

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    At 4" BS, they will rub the frame pretty good at full lock. You will also need to do some trimming of the inner fender liner, pinch weld and fender flare.

    This is a 4.5" BS with a .75" spacer, essentially a 3.75" BS.
    [​IMG]
     
  6. Apr 9, 2012 at 5:44 PM
    #6
    Gage

    Gage [OP] Active Member

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    OK - so the added width of the 285 vs 255 necessitates increased backspacing. So I need to look at wheels with 4.5" or greater backspacing?

    For some reason I had it reversed in my head and thought less backspacing created more clearance to the frame and not less.
     
  7. Apr 9, 2012 at 5:47 PM
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    KPT

    KPT sees what you did there.

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    You do need LESS backspacing. John is saying his wheels have 3.75 of effective backspacing. I would look for 3.75 max, 3.5 would be better.
     
  8. Apr 9, 2012 at 5:48 PM
    #8
    JDMcQ

    JDMcQ Well-Known Member

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    You were correct. Backspacing is the distance from the mounting face of the back of the wheel to the inner edge of the rim. the lower the measurement, the farther out the wheel will from the frame.

    You want 4" or less of backspacing.
     
  9. Apr 9, 2012 at 6:22 PM
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    Gage

    Gage [OP] Active Member

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    OK Cool - I'm back to being only moderately confused now. So with 3.75" of backspacing the tire is just about even with the fender flare and 3.5" will start to stick out slightly.

    Thanks guys
     
  10. Apr 9, 2012 at 6:23 PM
    #10
    KPT

    KPT sees what you did there.

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    That's highly dependent on the width of the wheels.
     
  11. Apr 9, 2012 at 6:25 PM
    #11
    Gage

    Gage [OP] Active Member

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    I'm looking at 16x8 wheels
     
  12. Apr 9, 2012 at 6:32 PM
    #12
    JDMcQ

    JDMcQ Well-Known Member

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    Mine are 8" wide and stick out past the fender .5 to .75"
     
  13. Apr 10, 2012 at 12:18 PM
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    Gage

    Gage [OP] Active Member

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    Ok SO I am finding it near impossible to find a 16x8 wheel with 3.75" of backspacing. It seems that 16x8 wheels come standard in 4.00" or 4.50" backspacing with 4.5 being most common. If I'm missing something please let me know.

    How much trimming is required with this amount of backspace?

    I'm putting on LR UCA's and don't mind trimming plastic or rolling pinch welds but I would like to stay away from hitting the frame or cutting into the Cab.
     
  14. Apr 10, 2012 at 12:25 PM
    #14
    JDMcQ

    JDMcQ Well-Known Member

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    You can get a .75" wheel spacer to help with the frame rub.

    Have the truck aligned and have them dial in 3+ degrees of positive caster. This will pull the wheel slightly forward in the wheel well and give the truck a little more straight line stability. You will still have to roll, or cut the pinch weld, but that may be it. I had to reshape the firewall but I have not had the alignment done yet due to frozen adjusters.
     
  15. Apr 10, 2012 at 12:35 PM
    #15
    JDMcQ

    JDMcQ Well-Known Member

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    Crap. Yes I did. Thank you.
     
  16. Apr 10, 2012 at 1:23 PM
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    Gage

    Gage [OP] Active Member

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    I would prefer to stay away from Spacers (please don't take my thread off topic!! :)

    How badly would they rub on the frame?
     
  17. Apr 10, 2012 at 1:32 PM
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    JDMcQ

    JDMcQ Well-Known Member

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    I do not blame you on the spacers. I wanted to avoid them as well, but could not.

    BAd enough that you can hear/feel it when coming out of a parking spot. I have about as much lift as one should put on the front of a first gen to help alleviate it at regular ride height and they still rub. When off-road, I am sure that it will be worse when turning.
     
  18. Apr 10, 2012 at 2:14 PM
    #18
    Gage

    Gage [OP] Active Member

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    Ok Cool - you've been a huge help...

    After all this I think i am going to suck it up and get a 255 85 Mud Terrain or take a closer look at the Cooper STT Hybrid. According to the Expedition West article that tire will fully articulate and not hit the frame with a couple smaller mods to the inner wheel well.

    So what do you know about regearing the differentials? :confused:
     
  19. Apr 10, 2012 at 2:24 PM
    #19
    JDMcQ

    JDMcQ Well-Known Member

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    That is the tire size I should have gone with and that EW article is excellent.

    Regearing? I need to do mine too, not gonna mess with it myself though. I need to find $1200 to get East Coast Gear to take care of it for me.
     
  20. Apr 11, 2012 at 12:52 AM
    #20
    chad68

    chad68 Master Jedi Member I am...

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    Somewhere I had a pic posted of my gen 2 with 305/70/16's on 3" of lift fully cranked, showing the clearance to the body mount.

    I'm now on my second set of 305/70/16 tires (Mud Grapplers) and still have not hit the body mount. I trimmed a shit load of plastic though.

    Most likley miss the mount due to two reasons.

    1.
    I'm using the stock UCA's, so the castor has the tire further foreward from the body mount.

    2.
    Since my coilovers are set to 3", they are stiff and don't move a whole lot. My truck is a daily driver and occasional mud truck, so it works fine for my needs.

    If I crawled on rocks and my suspension actually moved, I would eventually hit at full lock.
     
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