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      11-14-2012, 08:26 AM   #1
evilstib
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17 X 8.5 ET40 square - Will it fit?

All,

Thinking about a 17 X 8.5 ET 40 square setup running PSS 255/35/17 on all corners...

If I calculated correctly, the fronts should stick out 9 MM more than stock and the rears would stick out 12 MM more than stock.

I think this will fit, can you chime in?
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      11-14-2012, 09:56 AM   #2
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Quote:
Originally Posted by evilstib View Post
All,

Thinking about a 17 X 8.5 ET 40 square setup running PSS 255/35/17 on all corners...

If I calculated correctly, the fronts should stick out 9 MM more than stock and the rears would stick out 12 MM more than stock.

I think this will fit, can you chime in?
Front you will rub for sure. I don't think you can stick 255 up front without some sort of adjustment to camber. I think the rears will be a close call, but from what I've seen it will probably rub.
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      11-14-2012, 11:06 AM   #3
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Quote:
Originally Posted by MteK
Quote:
Originally Posted by evilstib View Post
All,

Thinking about a 17 X 8.5 ET 40 square setup running PSS 255/35/17 on all corners...

If I calculated correctly, the fronts should stick out 9 MM more than stock and the rears would stick out 12 MM more than stock.

I think this will fit, can you chime in?
Front you will rub for sure. I don't think you can stick 255 up front without some sort of adjustment to camber. I think the rears will be a close call, but from what I've seen it will probably rub.
Agreed. I'll need camber plates.

I'm 5mm towards the fender compared to arc 8s on the front.

Rears are actually 17 mm towards the fender - 12 mm rim and 5 mm additional tire width.

I'm trying to run 17" arc 8 concave rims.

Anyone try this?
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      11-14-2012, 03:50 PM   #4
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Yes, camber plates are a must for what you're trying to do. The 17x8.5's have a 40mm offset. This is pretty close to ideal in the front with a meaty tire or r-compound (for strut tube clearance purposes) but it's not so ideal in the rear. In the front at that offset a 245/40/17 would fit cleanly with enough camber dialed in. You could even mount a 255/40/17 (a hair oversized on this heavy car, but it's commonly done by E36 and E46 guys on a budget).

The rear is a whole different animal. The 1 series easily has the worst rear fitment of any BMW I can think of. The rear has room for a lot of rubber, but it needs a high offset to fit, which makes it close to impossible to run a square setup without sacrificing tire width.

If you run a 245/40/17 rear tire on a 17x8.5" et40 wheel then you're running a wheel that is 12mm more aggressive then your stock wheels. The stock wheels are conservative, but when you put a meaty tire right out there at the fender lip with an offset like that, then you'll get rubbing. So a rear fender roll will be required. It's one thing to do this with a "show" or "street" oriented tire combo, but for track/autocross we are talking about wide tires that will be flexing to their limit under load and you'll neeed all the room you can get. The problem is you didn't want to roll your fenders you wanted a bolt on setup. If you installed 235's then you wouldn't have rubbing front or rear, but now you're not even coming close to the grip the car really needs. (I run 235/40's on a 2400lbs E30 M3 and I need more grip). Yes you could get around with that much rubber, but it's not even close to optimal.

With an aggressive fender roll the Nitto Sponsored bmwcca club racer is running our 17x8.5's with 255/40/17 NT-01's, so 255's can be run front and rear but it's not even close to being a direct bolt on fitment.

That being said if you want a simple bolt on setup. I would go the 245/40 on 17x8.5" route as all it requires is a rear fender roll. That fender roll allows for more rubber in the rear, which makes it one of the best bang for your buck mods.

As an example of the benefit of rolling: An E36 M3 can mount 245/40/17 on 8.5" square with no rubbing (but its really close in the back). Rolling is needed for 245's or anything wider on a 9" wheel. The guy who doesn't roll his car at all is forced to run the 245/8.5" combo, while the guy willing to roll can mount 255's front and rear on a wider rim. At the track you need that extra rubber (even more so on a heavy car). $100~ for a roll takes that restriction away.

18's are more expensive but an 18x8.5" et45 is available that can be run with 245/35/18's front and rear. a 2-3mm front spacer is needed for strut tube clearance when something like a Hoosier R6 is run in that size, but it's still rotatable which is important. The upside of the 18" squared setup is better sidewall support on a heavy car. The down side is limited availability of 245/35/18's and their price tag vs. the wide range of cheap 17's available.

17x9" square is not at all ideal on the 1 series because the rear fitment issue will be exaggerated. It works up front, but is a major compromise in the rear.
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      11-14-2012, 05:13 PM   #5
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18x9 on 275s ftw.
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      11-14-2012, 05:45 PM   #6
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Quote:
Originally Posted by phrenetiK
18x9 on 275s ftw.
Agreed.

But I find the non concave ones fugly and to be honest, can't get a 100% commitment from apex that 275/30/18 won't require a fender pull.

But it would be ftw!!!
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      11-15-2012, 02:53 PM   #7
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Quote:
Originally Posted by evilstib View Post
Agreed.

But I find the non concave ones fugly and to be honest, can't get a 100% commitment from apex that 275/30/18 won't require a fender pull.

But it would be ftw!!!
Any of our wheels that will fit a 1 series will not have a concave wheel face. This is due to the 1 series's very conservative strut and fender clearances. All of our wheels designed for your 1 series have maximum width fitment in mind therefore the wheels are using a slightly higher offset to fit wider tires for greater grip on the street and track. Currently tire manufacturers do not make a 275/30/18 tire size. Some of our customers have fit a 275/35/18 on the rear of their cars using our 18x9.5" ET62 ARC-8 but there are inner suspension clearance issues. If you space the wheel out than you will need to roll your rear fenders or possibly pull them depending on the type of tire used. That is why we always recommend a 265/35/18 rear tire with our 18x9.5" 1 series fitment rear wheels.
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      11-15-2012, 03:02 PM   #8
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We need to petition Apex to make some 17" versions of their EC-7 or ARC-8.
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      11-15-2012, 03:05 PM   #9
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Sorry dupe post...
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      11-15-2012, 06:39 PM   #10
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Quote:
Originally Posted by Freon
We need to petition Apex to make some 17" versions of their EC-7 or ARC-8.
I'd like a 17" ET 45 concave version.

Apex...do it!!!!
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      12-05-2012, 08:00 PM   #11
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Quote:
Originally Posted by evilstib View Post
I'd like a 17" ET 45 concave version.

Apex...do it!!!!
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      12-05-2012, 11:46 PM   #12
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If they make a 17x8.5 ET45, I bet its going to rub the front strut.

What would really help is a 17x9.0 ET50 for the rear.
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      12-05-2012, 11:51 PM   #13
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Quote:
Originally Posted by John_01 View Post
If they make a 17x8.5 ET45, I bet its going to rub the front strut.

What would really help is a 17x9.0 ET50 for the rear.
The worst part of everything is that 17x9 et50 is a very common JDM rear tire setup.

A lot of highquality and light wheels are avaiable in that size for the S2K - too bad the bolt patterns dont match up



A side note - i run 245/40 17 Star Specs in the summer on a 17x8 square setup. The fronts will rub without decent camber - hell my front rub without any dialed in.
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      12-16-2012, 04:15 AM   #14
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Apex should make new arc8 for 1series in these fitments :
Front 8X17 ET40
Rear 8.5X17 ET45 or 8X17 ET40

It would be great !!!
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      12-07-2013, 02:16 PM   #15
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Quote:
Originally Posted by ApexRaceParts View Post
Yes, camber plates are a must for what you're trying to do. The 17x8.5's have a 40mm offset. This is pretty close to ideal in the front with a meaty tire or r-compound (for strut tube clearance purposes) but it's not so ideal in the rear. In the front at that offset a 245/40/17 would fit cleanly with enough camber dialed in. You could even mount a 255/40/17 (a hair oversized on this heavy car, but it's commonly done by E36 and E46 guys on a budget).

The rear is a whole different animal. The 1 series easily has the worst rear fitment of any BMW I can think of. The rear has room for a lot of rubber, but it needs a high offset to fit, which makes it close to impossible to run a square setup without sacrificing tire width.

If you run a 245/40/17 rear tire on a 17x8.5" et40 wheel then you're running a wheel that is 12mm more aggressive then your stock wheels. The stock wheels are conservative, but when you put a meaty tire right out there at the fender lip with an offset like that, then you'll get rubbing. So a rear fender roll will be required. It's one thing to do this with a "show" or "street" oriented tire combo, but for track/autocross we are talking about wide tires that will be flexing to their limit under load and you'll neeed all the room you can get. The problem is you didn't want to roll your fenders you wanted a bolt on setup. If you installed 235's then you wouldn't have rubbing front or rear, but now you're not even coming close to the grip the car really needs. (I run 235/40's on a 2400lbs E30 M3 and I need more grip). Yes you could get around with that much rubber, but it's not even close to optimal.

With an aggressive fender roll the Nitto Sponsored bmwcca club racer is running our 17x8.5's with 255/40/17 NT-01's, so 255's can be run front and rear but it's not even close to being a direct bolt on fitment.

That being said if you want a simple bolt on setup. I would go the 245/40 on 17x8.5" route as all it requires is a rear fender roll. That fender roll allows for more rubber in the rear, which makes it one of the best bang for your buck mods.

As an example of the benefit of rolling: An E36 M3 can mount 245/40/17 on 8.5" square with no rubbing (but its really close in the back). Rolling is needed for 245's or anything wider on a 9" wheel. The guy who doesn't roll his car at all is forced to run the 245/8.5" combo, while the guy willing to roll can mount 255's front and rear on a wider rim. At the track you need that extra rubber (even more so on a heavy car). $100~ for a roll takes that restriction away.

18's are more expensive but an 18x8.5" et45 is available that can be run with 245/35/18's front and rear. a 2-3mm front spacer is needed for strut tube clearance when something like a Hoosier R6 is run in that size, but it's still rotatable which is important. The upside of the 18" squared setup is better sidewall support on a heavy car. The down side is limited availability of 245/35/18's and their price tag vs. the wide range of cheap 17's available.

17x9" square is not at all ideal on the 1 series because the rear fitment issue will be exaggerated. It works up front, but is a major compromise in the rear.
Will the same apply to 18x8.5 et40? I, looking at rpf1s and trying to find a happy median for tires. Was thinking 235 square.
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      12-09-2013, 06:38 PM   #16
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Quote:
Originally Posted by kobeballer96 View Post
Will the same apply to 18x8.5 et40? I, looking at rpf1s and trying to find a happy median for tires. Was thinking 235 square.
That is correct, the same would apply with the 18x8.5" ET40. The only difference is depending on your tire size for the 18" diameter, the rolling diameter might be a bit taller than the 17" version with the same width, and can cause rubbing issues. For example, a 235/40/18 is a full inch larger in overall diameter than the 235/40/17, while the 245/35/18 is a very rare size, but is only 0.1" taller. The 245/35/18 is also only 0.1" taller than the 245/40/17 tire size.
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