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      06-04-2018, 10:23 PM   #1
352M6GranCoupe
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M6 GranCoupe CP Spacer help

I’ve been searching for quite some time and wanted to see what setup I should go with on my M6 Grancoupe competition package. I see a lot of people end up going with 10F/10R, 12F/10R, or 12F/10R... after looking at my car from various angles I was thinking of going 10F/12R. Maybe I’m crazy but the 601 rear wheel on my Grancoupe seems more tucked in when compared to the front. Does anyone have a pic of ther M6 GC with 10F/12R???

Thanks in advance!
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      08-04-2018, 09:32 AM   #2
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My original plan was 15MM front & 12MM rear. Problem is the front tire has a lip so it poked out of the fender by 4MM or so. If that lip matched the rear tire then I would have stayed with this setup.

KW HAS kit | wheel alignment set to even tire wear

12MM front & 15MM rear.










Last edited by BadSeed; 12-12-2018 at 02:38 PM.
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      08-08-2018, 07:03 AM   #3
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I went with 5mm all around after putting on my HAS kit. I talked with IND when I was purchasing mine and that's what they recommended.

As I was putting them on I could see a dramatic difference even with just 5mm. I didn't take before/after photos unfortunately.

Think 5 also gives me options when I eventually move to a 275/305 setup down the road as well.
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      12-11-2018, 03:50 PM   #4
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I like the look very much but what about stone chips maybe 10/10 is the more safe version. What do you think. how does the drive feeling change?
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      12-12-2018, 05:09 AM   #5
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I have no rubbing or issues running stock tire size, 343m wheels, KW HAS (as per lowest setting indicated in the instructions that came with the HAS kit), and 12mm spacers all around.[IMG]undefined[/IMG]
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      12-12-2018, 10:38 AM   #6
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This answer is useless without pics. what about cart tracks.
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      12-12-2018, 11:04 AM   #7
xxTHIR13ENxx
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I'm actually thinking of going with 10mm/12mm spacers myself.
Was about to start a thread on the subject, but glad to see someone else is pondering the same thing.

After looking at BadSeed, might consider 12/15 instead...
Are you running OEM tire sizes on those pics?
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      12-12-2018, 02:01 PM   #8
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Quote:
Originally Posted by xxTHIR13ENxx View Post
I'm actually thinking of going with 10mm/12mm spacers myself.
Was about to start a thread on the subject, but glad to see someone else is pondering the same thing.

After looking at BadSeed, might consider 12/15 instead...
Are you running OEM tire sizes on those pics?
Yup. 265/35/20 | 295/30/20
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      12-12-2018, 02:10 PM   #9
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Quote:
Originally Posted by BadSeed View Post
Yup. 265/35/20 | 295/30/20
Nice. So now I'm thinking 10f/15r or 12f/15r (not ashamed to copy!)
Is anyone running 10/12/15 spacers on stock suspension? Pics?

BadSeed, any more pics of your setup? Different angles, etc..
Thanks, and sorry for hijacking the thread.
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      12-12-2018, 02:27 PM   #10
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Quote:
Originally Posted by xxTHIR13ENxx View Post
Nice. So now I'm thinking 10f/15r or 12f/15r (not ashamed to copy!)
Is anyone running 10/12/15 spacers on stock suspension? Pics?

BadSeed, any more pics of your setup? Different angles, etc..
Thanks, and sorry for hijacking the thread.
No other pics w/ stock rims. Only 1 I found & had to over expose to see the rims



If you plan on having 2 passengers in the rear, might be best to play it safe. 12f/12r

Found 1 more...


Last edited by BadSeed; 12-12-2018 at 02:34 PM.
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      12-12-2018, 05:08 PM   #11
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Quote:
Originally Posted by BadSeed View Post
If you plan on having 2 passengers in the rear, might be best to play it safe. 12f/12r
Yeah, looking at it, I'm thinking 10f/12r, to be honest. Looks nice, just a bit too aggressive for my taste.
Also, just to confirm, you're already dropped on the two pics, right?
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      12-12-2018, 05:31 PM   #12
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Quote:
Originally Posted by xxTHIR13ENxx View Post
Yeah, looking at it, I'm thinking 10f/12r, to be honest. Looks nice, just a bit too aggressive for my taste.
Also, just to confirm, you're already dropped on the two pics, right?
Yup. I basically picked up the car from the dealership then drove it straight to a shop for the KW HAS install.
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      12-12-2018, 06:33 PM   #13
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This isn't adding up based off everything I've read on the forums...So I just had h&r springs installed today on my m6gc with 12mm spacers out back, none in the front, and I'm 100% rubbing in the rear on semi steep dips and bumps. On my 50 mile trip back home, I heard it rub about 4x. So I examined the tires once I got home and I could see very faint "scratches" on the tire...What am I missing?? For those of you saying you have no issues rubbing, is that based off of smooth, straight roads? FYI I'm running stock 295 tires...Considering dropping down to a 10mm..Not sure if this slight rub will cause me issues down the road...


Edit: I did have the factory springs in the trunk, approx. 45/50lbs, but I'd hope that wouldn't cause this rubbing issue because that means I'm in deep sh*t if I have adult passengers in the back seat lol...

Last edited by Flo1989; 12-12-2018 at 08:14 PM.
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      12-13-2018, 01:40 PM   #14
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If you have just a slight rub you probably need an alignment. Get the back a tad more aggressive. That, when the spring dive in (compress) the wheel dive into the wheel well. I was considering of 12 or even 15 in the back. But now

Last edited by Havy; 12-13-2018 at 02:01 PM.
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      12-13-2018, 02:46 PM   #15
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With 15MM I had slight rubbing. Just enough to leave a mark & remove tire gel. Its definitely not cutting into the tire. Occurs on steep driveways & shallow dips driving 30+ MPH. Didn't hear it going over speed bumps.

20+ yrs of lowered vehicle ownership so I have a habit of practically stopping prior to a slow approach over speed bumps, steep driveways & changing lanes if I know there is a dip coming. With new vehicles, I also switch the suspension to the stiffest setting (Sport+) before the approach...

If springs were just installed, alignment should be performed.
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      12-13-2018, 09:27 PM   #16
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Quote:
Originally Posted by Havy View Post
If you have just a slight rub you probably need an alignment. Get the back a tad more aggressive. That, when the spring dive in (compress) the wheel dive into the wheel well. I was considering of 12 or even 15 in the back. But now
Thanks for the tip. Although I was pretty annoyed initially about it, I haven't noticed it when driving today. With it being very minimal, I would still opt for spacers. Maybe not 15, but 10-12mm. The more aggressive stance + the drop is just

Quote:
Originally Posted by BadSeed View Post
With 15MM I had slight rubbing. Just enough to leave a mark & remove tire gel. Its definitely not cutting into the tire. Occurs on steep driveways & shallow dips driving 30+ MPH. Didn't hear it going over speed bumps.

20+ yrs of lowered vehicle ownership so I have a habit of practically stopping prior to a slow approach over speed bumps, steep driveways & changing lanes if I know there is a dip coming. With new vehicles, I also switch the suspension to the stiffest setting (Sport+) before the approach...

If springs were just installed, alignment should be performed.
Thanks for the insight. I will play around with it a bit and try out sport & sport + for the dampers - as I was in comfort mode during my experience.


I actually did my own little test today and cleaned the inside of the fender well lip and took it for a drive. I then began to do the opposite of what we'd normally do; look for bumps, steep driveways, etc. I didn't hear anything and when I arrived back home, the fender well lip was still clean - no residue from the tire coating. This of course was a good sign. I think I'm going to stick with the 12mm for a while as I really like the stance it gives me.


I did not get an alignment as I just had the springs installed yesterday. Since it will be sitting in the garage for the next couple of months (Ohio winters) my plan was to get the alignment early March when I get new tires. In your experience, have you found it best to go with OEM spec for the alignment, even after lowering?
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      12-14-2018, 09:37 AM   #17
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Quote:
Originally Posted by Flo1989 View Post
Thanks for the tip. Although I was pretty annoyed initially about it, I haven't noticed it when driving today. With it being very minimal, I would still opt for spacers. Maybe not 15, but 10-12mm. The more aggressive stance + the drop is just



Thanks for the insight. I will play around with it a bit and try out sport & sport + for the dampers - as I was in comfort mode during my experience.


I actually did my own little test today and cleaned the inside of the fender well lip and took it for a drive. I then began to do the opposite of what we'd normally do; look for bumps, steep driveways, etc. I didn't hear anything and when I arrived back home, the fender well lip was still clean - no residue from the tire coating. This of course was a good sign. I think I'm going to stick with the 12mm for a while as I really like the stance it gives me.


I did not get an alignment as I just had the springs installed yesterday. Since it will be sitting in the garage for the next couple of months (Ohio winters) my plan was to get the alignment early March when I get new tires. In your experience, have you found it best to go with OEM spec for the alignment, even after lowering?
Glad to hear your testing resulted in a positive note.
Last 2 vehicles I've owned, alignment is set to even tire wear (OEM spec) after lowering. Prior to that due to camber I would have to dismount the rears every 4000 miles or so & swap left to right just to make them last longer. Otherwise the inner corner would wear out & need to be replaced every 9000 miles or so.
The last 2 vehicles were also ///M cars so no need to roll the fenders. For the non ///M models, I didn't feel like rolling the fenders so I went for the cambered setup instead.
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      12-17-2018, 01:02 PM   #18
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Figured this may help someone considering 12mm spacers in the rear. Before/After...
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      12-17-2018, 02:38 PM   #19
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I think I just made my choice. thank you @Flo1989
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      12-17-2018, 03:33 PM   #20
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Quote:
Originally Posted by Flo1989 View Post
Figured this may help someone considering 12mm spacers in the rear.
YES! I saw your car over the weekend on another thread; immediately placed my purchase. lol.

Going with 10mm fronts and 12mm rears. Still on stock suspension, but for some reason it looks pretty low (to me) already, so we'll see.
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      12-17-2018, 04:10 PM   #21
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Just checking these are 295 rears?
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      12-17-2018, 04:18 PM   #22
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Quote:
Originally Posted by Havy View Post
I think I just made my choice. thank you @Flo1989
Anytime!

Quote:
Originally Posted by xxTHIR13ENxx View Post
YES! I saw your car over the weekend on another thread; immediately placed my purchase. lol.

Going with 10mm fronts and 12mm rears. Still on stock suspension, but for some reason it looks pretty low (to me) already, so we'll see.
Yup - that's going to be a nice set up. If I were to ever run spacers in the front I'd go with 10mm also. Do you have a competition pack car? If so, they're lower than the non comp cars by like .25" inch I believe.

Quote:
Originally Posted by brad850csi View Post
Just checking these are 295 rears?
Yes, 295 rears. I actually wanted to run 295 Cup 2's in the rear but the sidewall is taller than the SS so I think I would run into issues. So I'll probably just run Sport 4S all around.
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