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Last Post 03 Mar 2014 10:13 AM by  autocrossaddict
SMF 15" Wheel setup
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autocrossaddict
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04 Feb 2014 09:25 AM

    Going all in on my R58 Mini SMF build so I'm trying to sort out the 15" wheel setup for a FWD car.  I know 15x10 up front so I can get 275s on, but what about the rear? 10x9? 10x8? How much narrower of a tire? 255s?

    Thanks for any advice!

    IntrigueGX
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    04 Feb 2014 09:14 PM
    The 275s could use more than 10" of wheel. I'd start at 11" if you can. There is a new 245/40R15 A6 that might be just as good for 10" wheels and easier to fit and a bit cheaper.

    I tried a 245/40R17 185/65R14 stagger on my Saturn once. It was fine.
    autocrossaddict
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    05 Feb 2014 01:24 PM
    As I do research into offsets, and sizes and clearances, it may take me a season or two to get the fitment right. Finding 15x10s in 4x100 is looking difficult since 949 isn't making the 6UL right now. I may start with 15x9s and the 255s in the front and 15x8s with 235s in the rear.
    drdisque
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    06 Feb 2014 06:27 AM
    Have you looked at this? - http://www.diamondracingwheels.com/...eet-wheels

    Not as nice looking as the 6UL, but, you know, because race car.
    ron
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    07 Feb 2014 07:58 AM
    There are so many confusing numbers on here I don't know what you guys are trying to say. But my .02. 275-35-15 on a 15x10 is a proven set up, although it would work a little better stretched on an 15x11. Then you run into a very very wide car. On the rear the 15x8 keeps the car narrow and is enough for the 225 to work and the 15x9 is the optimal width for the 225. Hoosiers like to be stretched to work optimally, otherewise add a couple of pounds to stiffen the side walls, and it will help with the narrower rims.
    autocrossaddict
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    07 Feb 2014 08:22 AM
    So 225s in the rear, not the new 245s? Too much tire in back with them?
    IntrigueGX
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    07 Feb 2014 09:23 AM
    Posted By autocrossaddict on 07 Feb 2014 08:22 AM
    So 225s in the rear, not the new 245s? Too much tire in back with them?

    The 225s would probably be better in the rear. You do want the rear width as narrow as possible. The front width doesn't matter as much.

    60/40 = 1.5
    275/225 = 1.22
    275/205 = 1.34

    The MINI mass distribution is worse than 60/40. You have to go pretty skinny in the rear tire width to equal that (275/1.5=183). Now generally the best FWD setup is to run the rear crazy stiff, so going that small may not work. I bet the 205s would be fine. The 205s are also happy on 15x8s.

    klodkrawler05
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    07 Feb 2014 01:11 PM

    Theres a new 15x10 that will fit in line with the 6UL

     

    http://www.flyinmiata.com/index.php...20%2015X10

     

    perhaps those would work for you?

    Renegade
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    08 Feb 2014 01:22 AM
    Spinwerks or Keizer will make anything you need
    racingfool
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    08 Feb 2014 03:10 AM
    275/225 on 15 x 11/15 x 9 is the way I would go.
    autocrossaddict
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    08 Feb 2014 09:02 AM
    Posted By klodkrawler05 on 07 Feb 2014 01:11 PM

    Theres a new 15x10 that will fit in line with the 6UL

     

    http://www.flyinmiata.com/index.php?deptid=4540&parentid=0&stocknumber=16-52050%20%2015X10

     

    perhaps those would work for you?


    Center bore is too small, but father-in-law has machine shop so I ordered a set. Give the limited availability of a good set of 15s I'm sure I can get my money back.

    davebs14
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    03 Mar 2014 10:04 AM
    I'll give some feedback from my car I ran last year. On the STF Mini I ran, I would run race tires at BMW events. 225/50-15 R1-S tires on 15x9F and 15x7.5R. Balance was decent. Eventually I switched over to the 14x6 miata wheels I had with very old 225 710s. This was a bit too much oversteer.

    IMO if I had 15x10-11 up front on a 275 Hooiser with the 225 on a 7.5-8 it would have been nice. The 8 out back would be ideal IMO. To me this would pinch the 225 a little bit and keep it tucked. But still allow some movement for rotation but not so much to be evil. And the slightly pinched tire would be a bit forgiving out back. 205s IMO are too narrow on a properly setup mini.

    As for front wheels the 949s are the best bang for the buck.


    Option B already stated would be 15x10 front and with 245s. If on a budget this might work well. And be less scrub. Something to test at least
    autocrossaddict
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    03 Mar 2014 10:13 AM
    Thanks for the info. I picked up the 275/225 setup to test once the wheels get in. Since I ordered 2 x 10, 9, & 8s I may use the 9s up front with 245s as my 'beater' set of r-comps and save the 275s x 10 for national events.
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