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

[Mystikal]

That's gonna be a heck of a lotta poke! Nothing smaller fits up front? Should I get 205/40 tires instead? Thanks.

15mm will leave a few sheets of paper of space between the front tires and struts.

If anything use 205/45 tires, 215/40 is very short.

[Varinn]

How do 225/50/15 fit on 15x7 et28 wheels? Car running has H&R/Billy sports, early model with tall rear arches. Is it a tight fit? Or should I stick to 205/55/15?

[E30SPDFRK]

Hey guys, I have some 7x15" wheels that I want to swap lips to 8x15".
The seller told me they're ET30, but that seems like bullcrap because I measured the backspace and it is 115mm, which should mean they're 7x15" ET13.
They have a 1.5in lip, so I've been looking at 2.5in lips to swap. If my calculations are correct, this would make the wheel 8x15" ET0.

Is this offset too agressive for track wheels? My intention was to run 225/45 tires, I'd be ok with 205/50 though.
No worries about the front fenders, I have fiberglass ones, not sure about the rear, though they're already rolled.

Thoughts?

115mm of backspacing would give you an et26 wheel. Thats close enough to say you possibly had some error measuring the backspacing and they really are et30. If they are et26, they would be et13 when you built them out to 8's, et17 if they're et30 like he said. You could probably run a 225/45 with well-rolled fenders fairly easily.

[Fusion]

I could tell if I hadn't been stupid enough to never test fit them to the car.
What I did was went here http://www.rimsntires.com/specs.jsp, set it to 15 x 7 and changed the ET until the backspace read 115mm (which I measured in reality).
That says ET13.
Then When I change to 15 x 8, I have to go to ET0 to get the 115mm backspace.
Because changing the lip size won't have effect on the backspace.

I did a lot of reading last night and this setup 15 x 8 x 4.5in backspace is like the Diamondracing steelies some people here have done. There's also a red coupe with 15x8.5 ET6 BBS RS's, which should be the same "stance", regarding the fenders. And it looks great. I was hoping to get fat tires on them, oh well, I can sell 'em if all else fails.

[e30BMart]

Still not flush, and they'll also need 3mm spacers to clear the front struts.

So I need spacers to make it flush?

[BeirBrennerE30]

Kind of a backwards question... I know what tires I want to run and I just want to see if they will actually fit and to try to spec wheels to fit them.

325es
e30 M3 front suspension
e30 M3 or Mcoupe rear suspension(havnt decided yet)
want to run 255/40-17 or 255/35-18 o at the least 245/40-17 yokohama Advans A048 or AD08 on all 4 corners

I am obviously willing to roll fenders or pull them but how much? I am looking into the e46 sedan flares as well. What rim widths and offset could possibly fit these tires? Rims are going to be a custom affair if there is a chance.

Why? Because horsepower.... and I want to keep a square setup.

[Mystikal]

How do 225/50/15 fit on 15x7 et28 wheels? Car running has H&R/Billy sports, early model with tall rear arches. Is it a tight fit? Or should I stick to 205/55/15?

Outside isn't the concern, it's the front struts. Some 225s will work, some won't. You will need a 3mm front spacer (keep the stock bolts) for the beefy ones.

[Mystikal]

So I need spacers to make it flush?

Yes. 10mm front 15mm rear is a good start.

[Mystikal]

Kind of a backwards question... I know what tires I want to run and I just want to see if they will actually fit and to try to spec wheels to fit them.

325es
e30 M3 front suspension
e30 M3 or Mcoupe rear suspension(havnt decided yet)
want to run 255/40-17 or 255/35-18 o at the least 245/40-17 yokohama Advans A048 or AD08 on all 4 corners

I am obviously willing to roll fenders or pull them but how much? I am looking into the e46 sedan flares as well. What rim widths and offset could possibly fit these tires? Rims are going to be a custom affair if there is a chance.

Why? Because horsepower.... and I want to keep a square setup.

I like your thinking. 17x8.5 +25 is about perfect for the 255s (disclosure: I erred on the side of caution, they will be close to the struts. You can go +20 to make sure you'll never have to run a spacer with any tire fitted but obviously fender clearance is even worse). You'll need a good amount of front camber (-3) and a decent pull on the rear arches. Nothing outlandish, just a slight flaring of the lip. Obviously stiff spring rates are in order; I wouldn't go under 500/650 F/R.

"Because horsepower" is a line that won't leave my head for a bit.

[Varinn]

Outside isn't the concern, it's the front struts. Some 225s will work, some won't. You will need a 3mm front spacer (keep the stock bolts) for the beefy ones.

In that case I may opt for 205/55/15 fronts with 225/50/15 in the rear. Would I notice any strange handling characteristics by running this stagger? I'm not looking for overly aggressive tires either, it is a DD car. Currently I'm on a 205/50/15 square setup with Falkin Azine rt-215's and find it too much tire for a daily. Noise and rough ride are very present.

[ExViTermini]

Sad that there are few 17x8.5et25 wheels out there, I'm in the market for a set but few and far between it seems....

[BeirBrennerE30]

I like your thinking. 17x8.5 +25 is about perfect for the 255s (disclosure: I erred on the side of caution, they will be close to the struts. You can go +20 to make sure you'll never have to run a spacer with any tire fitted but obviously fender clearance is even worse). You'll need a good amount of front camber (-3) and a decent pull on the rear arches. Nothing outlandish, just a slight flaring of the lip. Obviously stiff spring rates are in order; I wouldn't go under 500/650 F/R.

"Because horsepower" is a line that won't leave my head for a bit.

I am running coilovers so I am thinking that would give some added space for the front tire. Thanks for the reply!... you dont think 265s would fit do you? lol

[kreasims]

Jay, need your advice. What is the best tyre size for 17x9/10 et 15 all round on an early E30? Thanks :)

[khnordeen]

Tire suggestions for 16x7 et20 (originally et35, but I have 15mm ECS spacers) Konig Remembers?

I see 215/40 and 205/45 suggested a lot. Just seeing which would be recommended. My car is pretty low if that will change your suggestions. Thanks

[KVF]

Being offered a set of wheels that "look" perfect for my DD application. How does 15x6.5 Offset: +40mm, Backspacing: 5.31" fit? I'd imagine all I'm fitting on those is 205/55. Does that offset/tire work for a near flush fit, or would I require spacers?
Thanks!