Ideal Square Setup on Stock Suspension? - Page 2 - BMW M5 Forum and M6 Forums
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post #11 of 20 Old 6th February 2017, 01:33 PM
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I may be one of the few who switched back to staggered setup from square. I used to have square style 65s all around with 275 tires, 3 mm spacers up front on stock suspension. Then on DINAN 1.5 suspension as well. Although it looks badass, I never track the car so rotating tires wasn't really an added bonus. I also didn't see any day-to-day steering benefit either. Factory staggered setup just "feels" better to me personally.

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post #12 of 20 Old 6th February 2017, 01:44 PM
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post #13 of 20 Old 6th February 2017, 02:11 PM
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Quote:
Originally Posted by jdauria View Post
I may be one of the few who switched back to staggered setup from square. I used to have square style 65s all around with 275 tires, 3 mm spacers up front on stock suspension. Then on DINAN 1.5 suspension as well. Although it looks badass, I never track the car so rotating tires wasn't really an added bonus. I also didn't see any day-to-day steering benefit either. Factory staggered setup just "feels" better to me personally.
Good call. Unless you really need the cross section due to weight, a wider tire will hurt scrub radius and steering feel. There is a reason 911s used a 205 front tire through the 80s and only recently went to 235s for the NA cars.

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post #14 of 20 Old 6th February 2017, 07:38 PM
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Quote:
Originally Posted by alpinerunner View Post
Good call. Unless you really need the cross section due to weight, a wider tire will hurt scrub radius and steering feel. There is a reason 911s used a 205 front tire through the 80s and only recently went to 235s for the NA cars.
Scrub radius is a function of the wheel offset not the tire width.

Edit: OE 8" front wheel offset is 20mm, OE rear 9.5" is 22mm. Hence using a 3mm spacer on the rear wheel up front only changes the scrub radius by 1mm (i.e. it has a net offset of 19mm).

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post #15 of 20 Old 6th February 2017, 07:46 PM
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Quote:
Originally Posted by TheBullet View Post
My 2 goals are: staying as close to stock OEM specs OR trying to widen the stance as much as possible without the potential for any wheel rub.

Which spacer setup leaves the beast with true "square" stance?

Recommendations? Thoughts?
All you "need" is a 3mm spacer up front for OE 9.5" and 275/35s yielding a net offset of 19mm.

I would forget using 5mm spacers anywhere due to loss of hub engagement. With the 3mm, the hub still protrudes enough through the spacer to engage the wheel bore.

Depending on the tire used, you may have some minor inner fender well rubbing at full lock. You will most likely experience an increase in tramlining as the front tires wear down running the 9.5/275s up front.

I've run a square setup now for 13 years, but now that I don't drive the M5 much anymore and never use it for autox/track anymore, I'm going back to staggered soon simply for the reduction/elimination of tramlining. Of course I've been using -2.4 camber up front too, and that contributes to tramlining. I'm going to reset that to around -1.5 also.

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Last edited by CSBM5; 6th February 2017 at 07:48 PM.
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post #16 of 20 Old 21st May 2019, 05:20 PM
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Hey fellas,

This seemed to be the most likely thread where I can hopefully get some advice.

I now have a brand new set of Style 32's in 18" x 9" form, with an offset of ET 24.

I was going to order up some 265/35/18's for these wheels as I think that would be the perfect fit. I have measured the front wheel on the car and it's incredibly close to the front strut, approximately 6-7 mm away.

Once I get tires mounted on the wheels, it will be my real test, but as of right now, the rear is a non-issue, and the front wheel fits, just barely and does spin freely. May be a different story once the 265's are on there, but I still think it would likely clear, but only by a smidge.

Going with the theories in this thread that the end result should be a net offset of 19 (how come not 20 as the OE fronts are an ET 20?) - this means I would need to use a 5mm spacer in the front minimum to get that end result of a 19mm offset. I ran some 20mm spacers awhile back on some aftermarket style 5's and they came with extended lugs and E39 center hub diameter on the spacers. Will I also need to do this for a 5mm spacer set? Or is the 5mm thin enough where the lug bolts will grab the hub and the wheel will still grab the center of the hub?

How come the desired end result is 19mm instead of 20mm for the offset like the OE wheels?

I may very well be able to get away with only 3mm spacer in front and none in the rear, but I'd like to keep the track width the same, so if I did it to the front, I'd also likely do it to the rear, even though the rear does not need it.

Thoughts?

Thanks! I will post up a pic or two here so you can see the clearance.

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post #17 of 20 Old 21st May 2019, 05:22 PM
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Pics of front clearance to strut





Wheel mounted on car to test



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post #18 of 20 Old 21st May 2019, 06:00 PM
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As for the 19mm goal, thats only if you have the 9.5 stock wheels with ET22.
If you are going to run 9in around, i would run it without spacers, or I would keep the ET at 20 if possible (but a 4mm spaced doesnt exist).
Ive run a square Style 65 with 12mm spacers in the front on KW V1 for 70k miles now. My wheel is 2mm away from the strut. I have never had contact while driving, even after getting the car airborne by accident.
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post #19 of 20 Old 21st May 2019, 06:11 PM
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Quote:
Originally Posted by centurycapital View Post
As for the 19mm goal, thats only if you have the 9.5 stock wheels with ET22.
If you are going to run 9in around, i would run it without spacers, or I would keep the ET at 20 if possible (but a 4mm spaced doesnt exist).
Ive run a square Style 65 with 12mm spacers in the front on KW V1 for 70k miles now. My wheel is 2mm away from the strut. I have never had contact while driving, even after getting the car airborne by accident.
Hey now! That's some confidence inspiring talk right there! OK, I'm sold then, I get tires, get them mounted then test fit sans spacers. Then maybe drive around and listen a bit. If all is good, I will roll for awhile and test it out, if I hear or see anything suspicious, then I will consider spacers. I'm hoping I'll be good to go..

Here is a pic of what "willtheyfit.com" said about my front swap from OE to the Style 32's... I tried 255/35's on the left, and 265/235's on the right. Distance to strut and fender is identical on both.
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wheel comparison 2.png  

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Last edited by Trizzuth; 21st May 2019 at 06:12 PM.
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post #20 of 20 Old 21st May 2019, 06:41 PM
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As alluded above, 3mm because a spacer is required to clear the struts and most coil overs with 9.5" Style 65 wheels with 275/35 tires and that thickness minimizes the change in scrub radius. I've never seen 2mm spacers that I'd want to use and until you get into 10mm or more, you deprive the wheel of proper hub engagement. Even 3mm is pushing it. 3mn is a functional and safe compromise for a specific setup.

I agree that you'll probably be okay with no spacer. Definitely don't do 5mm.

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