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

[Mystikal]

Great thread here!

Im looking at running 17x8 +40 and 17x9 +45 with 20mm 4 to 5 lug adapters. I figure the fronts will work perfect but wondering about that extra +5 in the rear and any clearance issues. Im on broadway static 16/18k. Pretty flexible on tire size as well...any recommendations sir?

Thank you!

That's pretty much perfect. I'd go with 205/40 front and 215/40 rear tires for easy fitment. If you really want big tires, 215/40 and 235/40 can work with some rear fender rolling and maybe pulling. I'd go for the stretch, though.

Also, a recommendation on your spring rates that's totally unasked for. That front rate is waaaaayyyyyy too high. The motion ratio of the rear suspension of an E30 means the wheel rate is, in reality, about 60% of the spring rate. The front is close to 100%. This means that in effect, your rear springs are the equivalent of 10K front springs.

I have almost the same coilovers, with a similar suspension setup (Z3M). I have tried an uncountable amount of spring rate combinations, and landed on 10K/18K as perfect. The ride quality difference going from just 12K to 10K was dramatic. There is zero chance of a street tire being able to handle 16K worth of spring, the front of your car will skip and bounce along the roadway rather than absorb the undulation and keep the tire planted. Again, totally uncalled for, but I'm telling you. The best mod you can do is 10 or 12K front springs to re-balance your car and let the front struts actually move.

[Mystikal]

16x8 et20 lowered on H&R race/e90hats.

16/45/??? Don't want to roll the fenders.:-D


edit, down for a mild roll. I really want to run 225s

Needs a rear roll for 225/45/16s.

[Mystikal]

Looking at some 16x8 +25 bbs wheels. HR/bilstine suspension setup. Would they work and what's the largest tire I could fit. May also in the future do UCC brake setup. Thanks ahead time.

3mm front spacers and 225/45/16 tires.

[Mystikal]

I've got 17x8.5" et40 5 lug kit with e36 hubs front (+12), z4 (+2.5) hubs rear. GC coilovers w/camber plates. What size tire and spacer can I run?

Thanks!

10mm spacers front and rear with 235/40s would work and look great.

[Mystikal]

Hey Mystikal, thanks ahead for the help!

Just bought 15x8 +20

What kind of tire size can I run?

Lowered with Vogtland springs and E90 top hats in the front.

No problem. 205/55, 205/50, and 225/45 work without modification. 225/50s require a rear fender roll.

[Mystikal]

Those Borbets weren't scraping on the strut housing when cranked to the ends as the sidewall-to-strut tube doesn't change when turning as they both turn together. What was scraping was the inner rim on the end of the swaybar at full lock. BTDT.


If those 15x7 wheels are truly ET27 they will not rub the strut housings since the tube angles further and further away from the sidewall the higher up you go, but that tire is taller than stock and might be tall enough to rub the underside of the front spring perch so you might want to check into that further.

Here's a pic of the strut clearance of my Kosei K1 15x7 ET27 with 225/50-15 Kumho V700 R-compound tires. Note where the spring perch starts angling away from the strut tube above the tread - this is the dimension i'd be concerned about with a taller 205/60 tire.

RANDY EFFING WALTERS

You were the E30 fitment king of bimmer.org, roadfly, etc. I learned so much from your Ronal/Kosei posts back in the 90s. What a surprise to see you stroll in here.

[Mystikal]

I have an E30 vert with E30 M3 5 lug swap.
Sitting on H&R sport OE springs.
I have camber plates in front set at -3 deg rear is also -3 deg from H&R springs.

I have a set of Style 5s 16x8 et23. Can I run 225 x 50 x16 Bridgestone potoenza re-71r for autox?

No, thanks to the thicker M3 hubs fitment is tight. 225/45 might just barely squeeze by with a rear fender roll.

[HoustonF34]

E30 Vert 16x8

No, thanks to the thicker M3 hubs fitment is tight. 225/45 might just barely squeeze by with a rear fender roll.

Thanks, this is a great thing you are doing.

For autox and fitment would you recommend 205/50 Potenza , Dunlop Direzza 225/45 or BFG Rizal S 215/45

[Staszek]

16"x8" ET29. Tires are 225/45R16.

What size spacers front and rear? 1990 325is on H&R Sport.

[dailyrider]

That's pretty much perfect. I'd go with 205/40 front and 215/40 rear tires for easy fitment. If you really want big tires, 215/40 and 235/40 can work with some rear fender rolling and maybe pulling. I'd go for the stretch, though.



Also, a recommendation on your spring rates that's totally unasked for. That front rate is waaaaayyyyyy too high. The motion ratio of the rear suspension of an E30 means the wheel rate is, in reality, about 60% of the spring rate. The front is close to 100%. This means that in effect, your rear springs are the equivalent of 10K front springs.



I have almost the same coilovers, with a similar suspension setup (Z3M). I have tried an uncountable amount of spring rate combinations, and landed on 10K/18K as perfect. The ride quality difference going from just 12K to 10K was dramatic. There is zero chance of a street tire being able to handle 16K worth of spring, the front of your car will skip and bounce along the roadway rather than absorb the undulation and keep the tire planted. Again, totally uncalled for, but I'm telling you. The best mod you can do is 10 or 12K front springs to re-balance your car and let the front struts actually move.

Huge thanks man. Great info. I ended up with a different set of wheels. Work 17x8/9 et 35 with 18mm adapters. Put 235/40 on the rear and 215/45 on the front...cause I nerded out about matching sidewalk height. Front clear with the roll and pull but I rub on the front of the wheel well. Rear is just about perfect. Going to try 215/40.

And yeah man no joke on the spring rates. Bouncy as fuuuug. I will be looking into your recommendation for sure.

Thanks again!


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[Idrisu]

Will this require spacers to clear the caliper?
front: bbs rs 039 16x7 et24
rear: bbs rs 040 16x8 et24

[rob0589]

I am currently purchasing esm 002's staggered 16x8 F(20 offset) 16x9 R(15 offset). What size tires are my best bet. Also, do i need spacers for the fronts or rears?

[parkerbink]

How well will these fit on a mostly stock '92 e30 Cabrio? 16x7 +30 4x100 Sparco Terra with 215/50-16 Dunlop Direzza DZ102.

[TheDirtyS54Thirty]

looking for a 15x9 and r comp that will fit under stock fenders and clear rx7 calipers?

[evanbenne]

16x8 et15 no fender rolling

Could I run a 16x8 et15 wheel with a 205-50-16 tire with no fender rolling?
If not what can I do to run 16x8s?