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Wheel Backspacing and Offset Info

Discussion in 'Wheels & Tires' started by tcBob, Jul 17, 2010.

  1. Apr 17, 2013 at 2:55 PM
    #461
    TRDPhreak

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    2.5" Leveling Kit - TUFF 17x8 AT T01 Wheels - Kumho KL71 265/70/17 MT
    Is that because the stock wheel is 7.5 and not 8?

    If that's the case, what about the -13 offset? At that point wouldn't it end up being 2.51"?
     
  2. Apr 17, 2013 at 3:57 PM
    #462
    KPT

    KPT sees what you did there.

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    Yes on the width. And the offset is just a different way of describing backspacing, and visa versa. So you are double counting if you use both in a calculation.
     
  3. Apr 17, 2013 at 4:01 PM
    #463
    TRDPhreak

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    2.5" Leveling Kit - TUFF 17x8 AT T01 Wheels - Kumho KL71 265/70/17 MT

    Ahh, gotcha. Thanks for the help. :cheers:
     
  4. Apr 27, 2013 at 1:19 PM
    #464
    hockeyplayer47

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    I have a 2006 tacoma with no lift. I want to put 17x9 rims on it with 4.5" of back spacing and -12 offset. would that work?
     
  5. Apr 29, 2013 at 5:56 PM
    #465
    acro

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    This all might be a bit more helpful if everyone knew what the specs/measurements of their stock rims are. I would like to know what mine are as an impromptu jumping off point. We all should know the rim size. Doh! It's on your tire. The other dimensions/measurements do become confusing. My stock steel 15s appear to have very little offset, (nearly a flat face) but I don't actually know what the offset really is. Of course, not much of this matters if you are going to lift. Thanks for reading. I'll watch for comments. This is my first post and I am shopping for wheels. My last Tacoma was a '96 with 14s and wheel covers. It played cassettes but there was never a drip or drop of anything in the driveway.
     
  6. May 3, 2013 at 6:40 AM
    #466
    Saren

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    Alright, I have to say that I didn't make it through all of the posts (tried, but failed) and at some points it made sense and then I would get all confused again. Anyway, though I am a member of the female gender, much like some dude in some thread (this one?) said, a diagram works to explain things in the best way.

    Just saying. Ahem.

    So- I went to one of the sites *first* posted which helped to compare tire/rim sizes and convert metric to US standard; then I went to one posted soon after--and let me tell you, ALL the info anyone needs is between these two sites. :eek: And the second one has pretty little diagrams that adjust according to your inputs! :cool: So cool.

    The only thing we need now is a calculator that takes into account if you are adding a lift kit--though, it doesn't take much thinking to figure that out, methinks. For instance, in my calculations, my new rims with the stock tires will move the wheels out 0.7" (not a problem, I measured). If I got new tires before getting a lift, I would fill out 13mm more of wheel well (according to rimsntires). Not a problem for my truck, again. Ta-da!

    P.S.
    Don't be silly. You're not confused because you're a girl... :facepalm:
     
  7. May 14, 2013 at 8:58 AM
    #467
    Mad Man Marty

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    Just need a ok here.
    I have a 2007 taco trd sport. Have stock wheels, 17x 7.5",with 5.5" backspacing.
    Will be adding tsb and add a leaf in back, still undecided in front, probably spacer but if not spacer, A lift that will not be more than 3".
    Considering 4 runner te wheels, 17x 7.5", with 4.5" backspacing.
    Will be sticking with 265/65/17 tires, and at most 265/70/17.
    My question is, are the 4 runner wheels ok to fit.
    Thx for the help.
     
  8. May 16, 2013 at 8:45 PM
    #468
    DSully72

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    so I have a question about the whole backspacing vs. offset thing. I'll use the Mickey Thompson Classics as an example. How is it mathematically possible for a 16x8" rim to have a backspacing of 4" but an offset of -12mm? if the backspacing (the back of the wheel to the mounting surface) is 4", that would put the mounting surface smack dab in the center (because 4 is one half of 8), so it would make sense to me that the offset would be 0mm? Can someone help me understand how this is possible?
     
    Last edited: May 16, 2013
  9. May 18, 2013 at 7:07 PM
    #469
    Cape Codder

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    I answered a similar question for a 9" Wheel on the previous page, here
    Should clear it up for ya


    CC
     
  10. May 23, 2013 at 4:46 AM
    #470
    TacoDeLaPlaya

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  11. May 23, 2013 at 2:45 PM
    #471
    DSully72

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    lol yeah I got it all figured out, apparently you have to add 1" to the width of the wheel... who knew? :notsure:
     
  12. Jun 6, 2013 at 11:01 AM
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    BLiX

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    I am new to trucks and I'm needing to know if a 16x8 rim with +10 offset fit a 2013 prerunner with factory suspension and tires?
     
  13. Jun 7, 2013 at 10:25 AM
    #473
    Grakyn

    Grakyn Well-Known Member

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    Hi guys, I am another noob that needs help piecing this together for the first time. Looking at some Nitto Trail Grappler 280/70/r16s. I have a 3" Toytec ultimate lift. What do I need to be looking at for backspace and offset for an optimal fit? I know I have seen similar setups on here. I think it was no greater than a 4.5" backspace and not sure of offset? Any help is appreciated. Thanks folks.
     
  14. Jun 7, 2013 at 1:50 PM
    #474
    DSully72

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    id go with a 4" backspace if possible. not sure which rims you are looking at but if you are looking onto steelies, summit racing sells 16x8 with a 4" bs for $55 a piece. they have both the cirlce hole design and the D shpaed hole design. other rims you just have to take a look at the specs.
     
  15. Jun 19, 2013 at 12:54 PM
    #475
    Costa09

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    Okay I admitt I didn't make though all the posts. I made it half way and still need some clearing up on my new setup. I already made a thread before I found this one. No sold answers that make me feel confident to pull the trigger on 1500 dollars of new rims and tires. I have searched and searched and I find some that say yes it will work and others no. Here is my question, I have a 3" OME lift and light racing UCAs I am currently running 285/70/17 with 17x9 XD Addicts with 4.5 BS and -12 OF. Have done trimming to plastic for these. I want XD Cranks 18x9 5 BS and 0 OF with 285/65/18 nitto Tera grapplers. Will it work or will 275/70/18 be better and keep me from chopping my cab mount.
     
  16. Jun 20, 2013 at 11:36 AM
    #476
    Costa09

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    Anybody help me out on the post approve? I also concerned I will scrub my UCA. Is 275/70/18 better option or can I run 285/65/18? Thanks again this is just bugging me. I really want these rims.
     
  17. Jul 15, 2013 at 4:00 PM
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    JMooney9

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    hey guys i got a 2011 doublecab tacoma with a 3" suspension lift, and i was looking into getting new rims and tires, looking to extend the tires out past the fender flares 1 - 1.5 inches on each side, i was thinking on running an 18" rim instead of a 17, any suggestions on what size tires to get and how much backspacing/offset for the rims? would 285's fit?
     
  18. Jul 15, 2013 at 8:27 PM
    #478
    Costa09

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    After market UCA's? I ran 285/70/17s. BFGs and XD Addicts. -12 offset and 4.5 back spacing. With minor trimming of the plastic inner fender well. Most will tell you to stick with 4.5 BS or less which is a good way to know that you will clear everything but all the guys that run rockstars have a 5 BS and it works with 275 tires, have heard of some 285 fitting also. When I was looking into new wheels I was told not to run 285 or larger with a 5 BS because of UCA clearance. But with my new 20s I just got I have a 5 BS and have the room for 285s I think. I got 275/60 to be safe ended up with a lot of room. Every truck is different though. I hope this helps some!
     
  19. Jul 17, 2013 at 1:46 PM
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    JMooney9

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    stock uca's. i may just go with 275/70/17's just to be safe, along with the XD addicts with 4.5" backspacing
     
  20. Jul 17, 2013 at 2:36 PM
    #480
    Costa09

    Costa09 Well-Known Member

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    I ran 285/70/17 with addicts for 2 years. The fake bolts will fade on you over time also.
     
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