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Best tire size for Ronal R10 Turbo 15 x 7 ET 25

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    Best tire size for Ronal R10 Turbo 15 x 7 ET 25

    https://www.mecatechnic.com/img/photos/zoom/UL20040.jpg

    Picked up a set of these wheels. Came off a 2002. My future suspension set up will be H&R sport springs, revalued Koni sports, adjustable rear sub frame. My 1990 325i with m20 is going to be an All purpose week end machine ( long, short distances, canyon blasting, very occasional AX. I want an All season tire and max grip and the selection is weak of 205 and 225 tires but I like the size on an e30. I know 205 55 15's fit. Not sure about 225 50 15.

    2 part question. What size yields better grip? Will the 225 tire fit in the wheel well without to much fender rolling?
    Anyone have Pictures of R10s on an e30?

    #2
    Use this resource: https://www.r3vlimited.com/board/for...fitment-thread
    And this: https://support.apexraceparts.com/hc...-Fitment-Guide
    And this: https://tiresize.com/calculator/

    If its 17x7 et25 we're talking, 215/40s should be perfect. Nothing over 40 ratio will fit comfortably under stock fenders (if using 17s).
    Last edited by Zambuzan; 10-14-2019, 09:03 AM.
    "Time doesn't heal anything... It just teaches us how to live with the pain." - My Cracked Dashboard

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      #3
      Oh Wow, I was on my first cup of Coffey. The size is 15 x 7.

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        #4
        I know this is late but on my SCCA DSP 89 325is Autocross car I ran meaty R-compound 225/50-15 Kumho and Hoosier tires on my 15x7 ET27 Kosei with no rubbing.

        I also ran the same tire size on a set 15x7 ET24 Euroweaves with no issues, as well as on 15x7.5 Ronal ACT-LS.

        There used to be a few pictures of my white E30 on the 15x7 Ronal Turbo wheels floating around the internet from when i had them on my car for a few weeks testing fitment for Ronal USA back in the early 2000's, and the photos were also used on their website and in their brochure, but i haven't seen these in a long time.

        .

        Randy Walters

        88 325is (w/89 bumpers, recently sold)
        89 325is (Broadsided long ago RIP)
        96 328is (Weekend fun car)
        03 530i Sport (current daily driver)
        05 X3 (little woman's car)
        Driving Instructor BMW CCA L.A. & S.D. Chapters
        Multiple L.A. & S.D. Region SCCA Autocross Championships

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