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Tire Fender Overhang Formula

Discussion in 'Wheels & Tires' started by cthomaschase, Mar 1, 2017.

  1. Mar 1, 2017 at 5:37 PM
    #1
    cthomaschase

    cthomaschase [OP] New Member

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    In a previous thread I created, https://www.tundras.com/threads/max...-stick-out-past-the-fender.10652/#post-185499, I was trying to determine exactly how combinations of wheels and tires result in fender overhang (i.e how much the tire is tucked under the fender) for my '17 CM. I received many great responses and figured I'd create a formula to show the exact(ish) results.

    I started by figuring out the distance from the front wheel hub to the fender, turns out it's 90mm (FYI the rear is 105). Using this, I came up with the following formula to determine fender overhang.

    Overhang = TW/2 - WO - 90

    TW = Tire Width
    WO = Wheel Offset

    So, for example, on the stock '17 CM with 255/70-18 tires and 18x8 wheels with 60mm offset, the calculation is 255/2 - 60 - 90 = -22.5mm. The same calculation on the rear is -37.5mm, or a 37.5 overhang of fender over tire.

    A negative number means the tire is tucked inside the fender, a positive number means the tire sticks out beyond the fender.

    What role does the wheel width play?
    None. The tire width is really what we're concerned with, the center of the tire is the same as the center of the wheel.

    What if I have spacers?
    Easy, spacers push the wheel and tire out towards the fender, so therefore add the size of the spacer to the final calculation. Remember 1" = 25.44 mm. For instance, if I added 1.25" spacers (which is 31.8mm) to my stock setup as before, the overhang would be 255/2 - 60 - 90 + 31.8 = 9.3mm, which means it actually would stick out past the fender about 0.37".

    Please let me know if you see any issues with this.
     
    Last edited: Mar 14, 2017
    Mattdf, chugs, EDDO and 11 others like this.
  2. Mar 1, 2017 at 6:05 PM
    #2
    831Tun

    831Tun crazy Bastrd

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    Nice formula. I haven't seen this before. Yep seems to work, crunched the #s with my set up 295 70 18, +60 offset and 1.25" spacers. Appears to be pretty close.

     
    joonbug likes this.
  3. Apr 7, 2017 at 1:16 PM
    #3
    cthomaschase

    cthomaschase [OP] New Member

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    Finally got around to using my formula and finding the wheels and tires I wanted.

    Went with the Method Mesh 18x9 wrapped with Yokohama Geolander 295/70-18.

    IMG_7761.jpg IMG_1004.jpg IMG_4043.jpg
     
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  4. Apr 7, 2017 at 2:03 PM
    #4
    louscrw

    louscrw all jacked up on Mt. Dew

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    in signature
    Missed this when originally posted, but nice work.
     
  5. Apr 8, 2017 at 1:10 AM
    #5
    831Tun

    831Tun crazy Bastrd

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    Liking the front bumper. I guess that's the one drawback, ya gotta buy a light bar too.
     
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  6. Apr 8, 2017 at 9:08 AM
    #6
    cthomaschase

    cthomaschase [OP] New Member

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    Exactly, looks weird without the light bar.
     
  7. Apr 8, 2017 at 10:34 AM
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    831Tun

    831Tun crazy Bastrd

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    I've still got bumper envy though!
     
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  8. Apr 12, 2017 at 10:16 PM
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    BenAZ

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  9. Apr 12, 2017 at 10:53 PM
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    Les7311

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    That's a great buy on the lights
     
  10. Apr 14, 2017 at 1:05 PM
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    TundraDan723

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    Excellent work!
     
  11. Apr 14, 2017 at 1:09 PM
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    az1441

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    Mine should in your appendix of grossly improper calculation
     
  12. Jul 5, 2017 at 8:09 PM
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    Vancepp

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    So using this leads me to believe that a 12.50 wide tire with a +1 offset will set the tire 2.66 inches PAST the fender... Would this be the case? I don't math well and just trying to see if I'm on the right track...

    Formula I used... 317.5(12.50) / 2 - 1 -90

    Any help is appreciated as like I said before... I don't math well.
     
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  13. Jul 5, 2017 at 8:10 PM
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    Jsena

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  14. Jul 5, 2017 at 8:19 PM
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    joonbug

    joonbug bacon

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    Yes, that's correct.
     
  15. Jul 5, 2017 at 8:22 PM
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    Vancepp

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    Thanks!
     
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  16. Jul 9, 2017 at 12:03 PM
    #16
    Vancepp

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    Just because... are we talking about the top of the fender or the bottom? Sorry.
     
  17. Jul 9, 2017 at 12:27 PM
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    joonbug

    joonbug bacon

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    I would think the top of the wheel well.
     
  18. Jul 9, 2017 at 2:49 PM
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    Vancepp

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    That's what I assumed as well... but all the pictures that I see with a +1 offset and a 12.5 wide tire do not look like they are out over two and a half inches.
     
  19. Jun 3, 2019 at 6:38 PM
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    ktmhauler

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    So i'm thinking putting my stock 255/70-18 tires on some new method wheels that have a 0mm offset instead of a 60mm offset of the stock steel wheels.

    Seems that would make them stick out 37.5mm or 1.5in

    Would that cause rubbing in the front?
     
  20. Dec 27, 2020 at 4:48 PM
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    BravoDeltaRomeo

    BravoDeltaRomeo Old Man Blue

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    I've seen this thread pop up in recommendations for tire offset a few times now, so figured I'd give it the bump it deserves.
     
  21. Jan 8, 2021 at 5:57 AM
    #21
    NoRcptn

    NoRcptn Better than mediocre poster

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    You're right. Well deserved bump.
    This was extremely helpful. I usually just add "tundras" to whatever I'm google searching and find what thread I'm looking for, but never saw this one. Thanks!
     
  22. Apr 4, 2021 at 3:57 AM
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    Bigdave

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    I have stock wheels on my SR5 2016, I want my tires to stick out 2” past fenders will a-24mm offset give me that??
     
  23. Apr 4, 2021 at 5:19 AM
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    NoRcptn

    NoRcptn Better than mediocre poster

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