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Thread: 235 in rear, or 255 up front

  1. #1
    Join Date
    Apr 2016
    Location
    Katonah, NY
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    645

    235 in rear, or 255 up front

    I'm looking to grab a set of Arc-8s the next time they have a group buy and just need a bit of help deciding out what route I should take. Here are my parameters:

    1. Must be 18 inch wheels as I am looking to reuse my tires, which are Michelin Pilot Super Sports.
    2. Must be square as I want to be able to rotate my tires.
    3. Must be finished in their matt bronze finish (thanks to nextelbuddy for convincing me how sexy they look)
    4. Must be able to retain the fairly comfortable ride I've become accustomed to.
    5. Must be able to keep this relatively affordable so i would like to use either my front (235/40/18) or rear (255/35/18) tires and just buy 2 more tires to complete the set.

    BONUS: I love the concavity look, but in order to obtain that I would need to go with an 18x9 et30 wheel. Rear won't be a problem but I don't know to what extent I would have to modify the front.

    I am not lowered an would be ok with having to run a spacer if clearance would be an issue. I don't want to but would be ok with rolling my fenders. I already have what I believe is a "safe" route planned: 18x8.5 et38 all around wearing 235/40/18. So I figure if I can't make all those requirements happen, I know what I'll be settling on. But if I can make the 18x9s work without ruining my ride, I wouldn't mind trying it out.

    So, what I'm wondering I can anyone recommend a set up that will make 1-5 and the Bonus all work on my car. I'm curious to see what scenarios the experts come up with to show trade offs.

    Joe

  2. #2
    Join Date
    Nov 2016
    Location
    Charlotte, NC
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    2,434
    18x9.5 et35 with the 235's should be alright. Might have to roll the rears.

    Edit: see here http://www.zhpmafia.com/forums/showt...t-Thread/page9

  3. #3
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    Apr 2016
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    645
    If he did 9.5s with 235, do you think I could get away with 9s and 255 up front? Or is that too much shoulder for the fronts?


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Mar 2017
    Location
    Boston
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    241
    Hey Joe, you may have it a little backward front vs rear. The rear will require a LOT more modifications to the fenders to fit a certain width and offset wheel.

    Unfortunately, you don't have many options here, given your level of comfort modifying your fenders. Requiring deep concavity, and an 18 inch wheel, limits you even further. 18x9.5 et38 would be a very aggressive fitment, I believe it is within 1mm of my fitment, both radially and axially (tire size and track width/position laterally out from the axle). You will not achieve this fitment without rolling your fenders close to their limit, which can also damage paint locally. This is the route I took, and I am unbelievably happy with the results, but it sounds like you are not interested in going this route.

    I think you should figure out what is most important to you; you will have to compromise somewhere!

  5. #5
    Join Date
    Apr 2016
    Location
    Katonah, NY
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    Sorry if there's confusion but I'm not at all looking to go 9.5, just 9. Does that give me more options?


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  6. #6
    Join Date
    Feb 2014
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    Picton, ON
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    Quote Originally Posted by joeybananaz18 View Post
    I am not lowered an would be ok with having to run a spacer if clearance would be an issue. I don't want to but would be ok with rolling my fenders. I already have what I believe is a "safe" route planned: 18x8.5 et38 all around wearing 235/40/18.
    that is definitely the safe, and correct, choice. i run 18x8.5 ET38 ARC-8s with 245/35/18 michelin PSS, and a 3mm spacer in the rear, and it rubs in the rear with passengers sometimes.

    BP runs an 18x8.5 ET35 BBS CH setup, with 255/35/18s and mildly rolled rear fenders, and i believe he had some occasional rubbing issues in the rear.

    rubbing sucks.
    peter

    2009 BMW 335i M Sport 6MT

    2015 VW Golf TSI Comfortline 5MT

    2007 BMW X3 3.0si M Sport 6MT

  7. #7
    Join Date
    Dec 2016
    Location
    Boston, MA
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    Quote Originally Posted by slater View Post
    that is definitely the safe, and correct, choice. i run 18x8.5 ET38 ARC-8s with 245/35/18 michelin PSS, and a 3mm spacer in the rear, and it rubs in the rear with passengers sometimes.
    Something in your numbers doesn't seem right - not that I'm challenging you. Just trying to understand fitments because I'm hoping to buy a set of Sportline 8s' next year and want to make sure I get the right sizes/offsets.

    If the OEM rear offset with a 18x8.5 wheel is ET50, why would you move the new 18x8.5 wheel outboard with an ET38 offset? I checked mine and saw at least 1/2" clear between the tire and the shock. Moving a 8.5" wheel out by 12mm seems unnecessary if it's the same width as stock, especially if you've gone down in tire size to a 245. If you were increasing the width of the wheel to, say, 9.5", THEN you'd need to move it outboard to keep it in the same relative position to the shock. Seems like there's also plenty of space between the tire and fender lip to move it out 1/2" without rubbing.

    What am I missing? If you were rubbing with a wider wheel and a 275, then I'd understand.

  8. #8
    Join Date
    Mar 2017
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    Boston
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    241
    Quote Originally Posted by cornercarver View Post
    Something in your numbers doesn't seem right - not that I'm challenging you. Just trying to understand fitments because I'm hoping to buy a set of Sportline 8s' next year and want to make sure I get the right sizes/offsets.

    If the OEM rear offset with a 18x8.5 wheel is ET50, why would you move the new 18x8.5 wheel outboard with an ET38 offset? I checked mine and saw at least 1/2" clear between the tire and the shock. Moving a 8.5" wheel out by 12mm seems unnecessary if it's the same width as stock, especially if you've gone down in tire size to a 245. If you were increasing the width of the wheel to, say, 9.5", THEN you'd need to move it outboard to keep it in the same relative position to the shock. Seems like there's also plenty of space between the tire and fender lip to move it out 1/2" without rubbing.

    What am I missing? If you were rubbing with a wider wheel and a 275, then I'd understand.
    It's because it looks better and still doesn't rub

  9. #9
    Join Date
    Dec 2010
    Location
    Fairfax Station, VA
    Posts
    2,805
    Know you want square, know you want 18’s, anyway here’s some measurements on 19’s and they rode on multiple ZHPs, both stock & lowered suspensions. Go to willtheyfit.com and type in the below data compared to what you want to see if it’ll fit. Fronts had no issues, rears were close but no fender rolling required.

    19" staggered VMR 710s
    - front 19 x 8.5 with 35 mm off set & 235/35-19 tires
    - rear 19 x 9 with 40mm offset & 265/30-19 tires

    Bruce
    14 GMC Sierra - mine
    16 X5 M-Sport - wife
    11 M3 - 1st son
    05 Tundra - 2nd son
    17 X1 M-Sport - daughter

    Former (mo/yr sold):
    15 335xi M-Sport (8/18)
    11 335is (8/17)
    11 X5 AW/blk (11/15)
    04 330xi blk/gray (7/15)
    06 ZHP SGM/blk (6/15)
    08 335xi blue/blk (4/15)
    04 ZHPci MB/blk (2/14)
    04 ZHPcic IR/Alc (10/13)
    01 540iT anthra/blk (7/13)
    04 ZHPci TIAG/blk (9/12)
    03 540i M-Sport (9/12)
    01 325ci (3/12)
    02 325iT 5MT (10/11)
    05 ZHPci (7/11)
    03 330cic (2/11)
    00 323ci (10/10)

  10. #10
    Join Date
    Dec 2010
    Location
    Fairfax Station, VA
    Posts
    2,805
    TIRERACK.com - Revolutionizing Tire Buying
    And here’s what that setup looks like with stock suspension

    http://www.zhpmafia.com/forums/attac...5&d=1400983634

    Bruce
    14 GMC Sierra - mine
    16 X5 M-Sport - wife
    11 M3 - 1st son
    05 Tundra - 2nd son
    17 X1 M-Sport - daughter

    Former (mo/yr sold):
    15 335xi M-Sport (8/18)
    11 335is (8/17)
    11 X5 AW/blk (11/15)
    04 330xi blk/gray (7/15)
    06 ZHP SGM/blk (6/15)
    08 335xi blue/blk (4/15)
    04 ZHPci MB/blk (2/14)
    04 ZHPcic IR/Alc (10/13)
    01 540iT anthra/blk (7/13)
    04 ZHPci TIAG/blk (9/12)
    03 540i M-Sport (9/12)
    01 325ci (3/12)
    02 325iT 5MT (10/11)
    05 ZHPci (7/11)
    03 330cic (2/11)
    00 323ci (10/10)

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