ASK ALL WHEEL/TIRE FITMENT QUESTIONS HERE - The Official Wheel/Tire Fitment Thread

[Bimmerman325i]

Jay,

what would be the ideal tire size for a four lug 17x7.5 et20? Fenders will be rolled for track rubber anyway, this is for street tires.

What would you recommend tire-wise for high grip, decent cost, but not autocross tires? Grip is most important, and I will be buying snow tires anyway.

Thanks!

[e30polak]

With a bit of fender pull, you can do it. It'd fit a lot better with 12mm though, but if you're willing to bend metal all the power to you!

I can have my spacers machined down to 12mm. So 12mm up front and how much in the rear with the 235/40????

[Mystikal]

cool, thanks for the recomendation, i didn't even think of those sizes.

do you think 215/35/18 on all 4 corners would work? this might sound stupid with my rim choice, but i like the way non staggard setups handle. haha, i should just sell the rims so i don't actually try to do this!

I don't blame you, I have 215/35/18 all around on my 18x8/18x9 BBS setup for the E36. I hate staggered setups too, at least with anything under 400hp.

I've never personally seen a 215/35 on a 10" rim. That would be extreme, it'd be tough to even find a place that could do it.

[Mystikal]

I want to run 16x9 ET15 Borbet Type A's in the rear with 225/45 16 tires. Will I have to roll fenders? If I can't fit 225/45s, what is the widest/tallest tire that I can run? These will be on a '91 Cabrio with a 1/2" drop in the rear.

Thanks,
Frank

You will definitely have to roll the fenders. Honestly, with a 16x9 setup, you'll likely have to roll the rear fenders a bit for any tire. Especially on a butt-heavy cabrio.

215/45/16 is an easier fit.

[Mystikal]

Jay,

what would be the ideal tire size for a four lug 17x7.5 et20? Fenders will be rolled for track rubber anyway, this is for street tires.

What would you recommend tire-wise for high grip, decent cost, but not autocross tires? Grip is most important, and I will be buying snow tires anyway.

Thanks!

215/40/17 is perfect. I'd recommend the Fuzion ZRi, excellent tire for the money.

[Mystikal]

I can have my spacers machined down to 12mm. So 12mm up front and how much in the rear with the 235/40????

12mm all around is good. With just a flat fender roll you should be fine with that setup.

[z31maniac]

I'm sure its in here somewhere, but I'll go ahead and ask.

What would the desireable offset range be to run a 225/50/15 in:
7"
7.5"
8"

Any idea when the RS3 is coming out? Otherwise I might do something crazy like run the R888 or RA1 in that size on the Enkei RPF1 or similar, under 10lbs!

[TexasE30]

16x7 +15 offset
16x8 0 offset

How much fender rolling to fit those in? i assume 215/50/16 all around for little stretch?

Thanks.

[frankiej]

You will definitely have to roll the fenders. Honestly, with a 16x9 setup, you'll likely have to roll the rear fenders a bit for any tire. Especially on a butt-heavy cabrio.

215/45/16 is an easier fit.

Thank you.

[Cream]

Hey jay I have a 89 325is with billy sports and h&r sport will 15x7et20 with 205/50/15 azenies fit perfectly?

[e30polak]

12mm all around is good. With just a flat fender roll you should be fine with that setup.

Should I run a 15 in the rear to make it more flush???

[Mystikal]

I'm sure its in here somewhere, but I'll go ahead and ask.

What would the desireable offset range be to run a 225/50/15 in:
7"
7.5"
8"

Any idea when the RS3 is coming out? Otherwise I might do something crazy like run the R888 or RA1 in that size on the Enkei RPF1 or similar, under 10lbs!

You dream up a new wheel/tire setup daily. Seek help.

ET25, ET25, ET20. If the tire is absolutely massive (over 9.3" section width or so) you may need to run a 3mm spacer with the latter 2 to clear the struts.

[Mystikal]

16x7 +15 offset
16x8 0 offset

How much fender rolling to fit those in? i assume 215/50/16 all around for little stretch?

Thanks.

Very aggressive on the rear. You'd be running 205/45/16 just for clearance.

[Mystikal]

Hey jay I have a 89 325is with billy sports and h&r sport will 15x7et20 with 205/50/15 azenies fit perfectly?

Oh yeah, perfect fit. No fender rolling, and those tires made my car happy. I miss them.

[Mystikal]

Should I run a 15 in the rear to make it more flush???

Sure why not. Just 3mm more rolling, which isn't much.