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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jan-25-2018, 12:22:49 AM   #501
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by mainstreamer00 View Post
I'm in the process of spec-ing new tires for my ZCP wheels.

With regards to the rear, many of my preferred choices (street-category UTG200) are difficult to find in the recommended 265/30/19 - aspect ratio being the rare point.

I'm probably going to run a R 265/35/19, which is marginally taller.. Anyone have any experience here? I know it's been quite well documented on the forums, and deemed no problem. Does anyone have any photos or confirmation?
I'm running 265/35/19 et22 9.5 with KW v2 without issue and I am slightly lowered. I am having a slight rubbing issue on the front with 245/35/19 et38 8.5. Going to investigate this weekend. The car has been raised a half inch since this photo from a few weeks ago.

Edit: The front was rubbing towards the top of the fender liner. I was able to fix by using a heat gun and pressure to push the fender liner inward at the points where rubbing was occurring.
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Last edited by oceansize; Sun, Jan-28-2018 at 02:25:08 PM. Reason: Resolution to front rubbing.
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Old Wed, Feb-14-2018, 04:59:12 AM   #502
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Default Re: e46 M3 Tire Sizing Thread

Looking for some advice for a square setup on 18x9.5 et28 wheels....was thinking 265/35 squared but just remembered this thread and am now thinking of 255/40 squared I'm running ~-2.5 degrees camber front/2.2 rear, height: ~12.8f/12.7...any input is greatly appreciated...
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Last edited by RynoS54; Wed, Feb-14-2018 at 05:09:02 AM.
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Old Tue, Feb-27-2018, 04:05:53 AM   #503
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Default Re: e46 M3 Tire Sizing Thread

Can anyone confirm if I can run 17x9 ET35s square? I will be getting coilovers and camber plates and planning on running AR-1 semi slicks (255/40/17)
haven't decided on coils but its looking like KW V3

Any thoughts on spacers/rubbing etc?
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Old Tue, Apr-10-2018, 02:21:34 PM   #504
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by Obioban View Post
This first post is not about fitment. Just because I list a setup as matched DOES NOT MEAN IT WILL FIT ON YOUR WHEELS OR IN YOUR FENDERS.

I'm going to attempt to lay down some basics for tire sizing on this car. This thread is going to be geared mostly towards street use, where DSC interference matters.

Okay, ground rule: You want the front and rear tire to have, as close as possible, the same rolling diameter. DSC works by comparing the rotational speeds of the various tires. If your rear tires have a smaller rolling diameter than the car expects, and the fronts are the same, the DSC will think at all times that you are having slight wheel spin (as the rears are rotating faster than the fronts). If the system is predisposed to thinking that you have slight spin, then it's much more prone to intervening-- it'll take much less to set off the DSC. That makes for unfun driving dynamics.

Before going any further, I think we should make everyone has an understanding of what tires sizes actually mean, as it's not as intuitive as you might thing. I'm bolding the middle part on profile, as that's the key part to all of this and the most misunderstood:



Take away: If you go with a wider tire, you need to run a smaller profile percentage to have the sidewall (and circumference with it) not become larger.

Okay, moving on:
The stock M3 tires sizes are
225/45/18, circumference: 81.6"
and
255/40/18, circumference: 81.8"

or

225/40/19, circumference: 82.0"
and
255/35/19, circumference: 81.8"

Notice how the circumference is nearly identical in stock spec. The closer you keep to that ratio, the less DSC interference you'll have. The numbers are close enough that for ease of use I just stick to 1:1.

Okay, so let's expand upon this. Most of us don't want to be running the stock setup as 225 is pretty small and understeery. So, what options does that leave us? Well, two categories: staggered (30mm) or square.


Staggered pairs that work well together:

18":

225/45/18, circumference: 81.6"
and
255/40/18, circumference: 81.8"

235/40/18, circumference: 79.8"
and
265/35/18, circumference: 79.5"

245/40/18, circumference: 80.8"
and
275/35/18, circumference: 80.4"

255/40/18, circumference: 81.8"
and
285/35/18, circumference: 81.2"

255/40/18, circumference: 81.8"
and
295/35/18, circumference: 82.1"


19":

225/40/19, circumference: 82.0"
and
255/35/19, circumference: 81.8"

235/35/19, circumference: 80.0"
and
265/30/19, circumference: 79.4"

245/35/19, circumference: 80.9"
and
275/30/19, circumference: 80.1"

245/35/19, circumference: 80.9"
and
285/30/19, circumference: 80.8"

255/35/19, circumference: 81.8"
and
285/30/19, circumference: 80.8"



Square setups that work:

225/45/18, circumference: 81.6"

235/40/18, circumference: 79.8"

245/40/18, circumference: 80.8"

255/40/18, circumference: 81.8"

265/35/18, circumference: 79.5"

275/35/18, circumference: 80.4"

285/35/18, circumference: 81.2"


One final note: For the purposes of DSC, all that matters is that the front and rear have nearly the same circumference. That said, as you get further away from the stock 81.7", the speedo will read faster and faster at the same speed (and the speedo comes about 5% fast from the factory, so you're just making a bad situation worse)
Question: Can i apply de square configuration: 255/40 18 with the stock suspension?.

Last edited by Obioban; Tue, Apr-10-2018 at 03:15:08 PM.
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Old Tue, Apr-10-2018, 03:15:33 PM   #505
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by Henry2018 View Post
Question: Can i apply de square configuration: 255/40 18 with the stock suspension?.
Assuming your wheel sizes/offsets support it, yes.
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Old Thu, Apr-19-2018, 06:00:03 AM   #506
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Question Re: e46 M3 Tire Sizing Thread

Need some help/advice..

Got a set of 18 ACS staggered wheels.
Fronts are OK 8.5 ET43 with 10mm and 225/45/18.
Rears are 9.5 ET 21.5 with 0.7mm spacer.
Will i have any DSC issues if fitting 245/40/18 rear with the 225/45/18 front? Iam afraid it will rub with 255/40/18 and final ET 14.5 (car is lowered on ACS springs)
The problem is that the ACS wheels came with these spacers and can't fit them without these spacers.
Otherwise i will search for spigot rings and manage to fit the rears without the spacers.

Last edited by zaharias; Thu, Apr-19-2018 at 07:47:01 AM. Reason: adding info
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Old Thu, Apr-19-2018, 11:14:56 AM   #507
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Default Re: e46 M3 Tire Sizing Thread

245 is too small for a 9.5.

I'd say get some wheels that fit properly.
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Old Thu, Apr-19-2018, 11:15:11 AM   #508
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Default Re: e46 M3 Tire Sizing Thread

245 is too small for a 9.5.

I'd say get some wheels that fit properly.

But, yes, you'll have increased DSC intervention running 225/245
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Last edited by Obioban; Thu, Apr-19-2018 at 11:57:47 AM.
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Old Thu, Apr-19-2018, 11:56:44 AM   #509
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by Obioban View Post
245 is too small for a 9.5.

I'd say get some wheels that fit properly.
Thanks for the reply.

245 on 9.5 it's ok i think but running up front.. I see a lot here having them up front on Apex 9.5s and is slightly streched, but it fits fine. I think 245s can fit from 8" up to 9.5s width wheels..

Anyway, I ordered a set of spigot rings (82mm to 72.5) to avoid the use of the spacer at the rear and i will be fine with ET 21.5 and the 255/40/18 that already have..
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Old Mon, Apr-30-2018, 09:19:39 PM   #510
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Default Re: e46 M3 Tire Sizing Thread

I'm sorry if this has been touched on previously, long thread.

Seems 235/35/19 is nearly identical to 275/30/19 in diameter, which makes me wonder why that isn't the preferred sizing over 245/35/19, 275/30/19.

I know the stagger with my first option is 40mm vs 30mm for stock and 30mm for my second (the more popular) option, however I would think diameter being closest to equal would trump stagger being closest to stock? Considering 235 is 10mm wider than stock, wouldn't this be better for preventing under steer rather than exacerbating it, regardless of stagger?

What am I missing?
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Discussing e46 M3 Tire Sizing Thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)