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

[Von Soman]

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?

[Zambuzan]

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).

[Von Soman]

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

[randywalters]

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.

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