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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 Sun, Oct-21-2018, 07:05:14 PM   #541
ATB88
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Default Re: e46 M3 Tire Sizing Thread

Time for new tires, gonna go back to PS4s all around this time

I'm running staggered OE 18s, stock suspension and alignment, street driving with a little bit of canyon/mountain roads and *maybe* a little bit of auto-x or track time in the next year. MK20 DSC.

Looking at Obioban's list of increasingly wide staggered 18" pairs that work well together, and list of disadvantages to running bigger tires, is it worth trying to go wider than the 225f255r combo that comes stock? Obviously I like the look of wider tires, and extra grip with less understeer tendency sounds great, but if it's going to make my acceleration noticably slower maybe it isn't worth going wider than stock? Any advice here?

Basically, I would like to go with the widest staggered 18" fitment for which I wouldn't really notice any disadvantages..
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Old Sat, Oct-27-2018, 03:26:49 AM   #542
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by 03FLBimmerm3 View Post
Looking to replace my tire setup, currently on stock 19s with stock tires 225/255 and GC coilovers. I track the car about twice a year, rest is weekend driving

Iím thinking of upgrading to the 235/35/19 265/30/19 setup however a good amount of people are telling me to go 265/35/19 in the rear.. this impacts the relative circumferences.. thoughts?



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I run 245/35/19 and 275/30/19 on OEM rims and have been pretty happy with the handling. Probably going to drop to 18's when i get new wheels though just to drop the unsprung weight.
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Old Mon, Oct-29-2018, 06:54:14 PM   #543
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Default Re: e46 M3 Tire Sizing Thread

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Originally Posted by ATB88 View Post
Time for new tires, gonna go back to PS4s all around this time

I'm running staggered OE 18s, stock suspension and alignment, street driving with a little bit of canyon/mountain roads and *maybe* a little bit of auto-x or track time in the next year. MK20 DSC.

Looking at Obioban's list of increasingly wide staggered 18" pairs that work well together, and list of disadvantages to running bigger tires, is it worth trying to go wider than the 225f255r combo that comes stock? Obviously I like the look of wider tires, and extra grip with less understeer tendency sounds great, but if it's going to make my acceleration noticably slower maybe it isn't worth going wider than stock? Any advice here?

Basically, I would like to go with the widest staggered 18" fitment for which I wouldn't really notice any disadvantages..
Anyone have suggestions? Best size combo out of the ones Obioban listed for an OE staggered 18 street car (that might see a tiny bit of HDPE this year)?? Would like to go wider than the stock 18 sizes if the downsides won't be noticeable for my application.
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Old Tue, Nov-27-2018, 07:56:22 PM   #544
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Default Re: e46 M3 Tire Sizing Thread

I mistakenly bought the wrong sized tires. How bad of an issue would this be? When doing the math, it seemed like the new setup should be better as the sidewall height is closer, but from what I've read online, people don't suggest this.

Current setup:
Front 245/35/19 (Circumference = 80.9)
Rear 265/35/19 (Circumference = 82.6)

New setup:
Front 235/40/19 (Circumference = 82.9)
Rear 265/35/19 (Circumference = 82.6)
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Last edited by stogybear; Tue, Nov-27-2018 at 11:34:17 PM.
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Old Tue, Nov-27-2018, 11:41:34 PM   #545
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Default Re: e46 M3 Tire Sizing Thread

I actually went down a rabbit hole and did a bunch of math. It looks like the sizes recommended on here would create a bigger change in the revs/mile and circumference of the tire than what my new setup would be. Used this tool to calculate then plotted them in google sheets. https://tiresize.com/calculator/

I'm mainly looking at revs/mile and circumference as the two key data points. Variation between front and back is as follows.

Circumference
Stock : 0.24%
Forum : 1.98%
New : 0.36%

Revs/Mile
Stock : 0.13%
Forum : 1.91%
New : 0.39%

In conclusion, it looks like 235/40/19 front and 265/35/19 rear are closer to stock ratios than 245/35/19 front and 265/30/19 rear.

Did I do something wrong?
Attached Images
File Type: png Screen Shot 2018-11-27 at 3.39.49 PM.png (210.2 KB, 15 views)
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Last edited by stogybear; Tue, Nov-27-2018 at 11:50:06 PM.
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Old Wed, Nov-28-2018, 01:38:42 AM   #546
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by stogybear View Post
I actually went down a rabbit hole and did a bunch of math. It looks like the sizes recommended on here would create a bigger change in the revs/mile and circumference of the tire than what my new setup would be. Used this tool to calculate then plotted them in google sheets. https://tiresize.com/calculator/

I'm mainly looking at revs/mile and circumference as the two key data points. Variation between front and back is as follows.

Circumference
Stock : 0.24%
Forum : 1.98%
New : 0.36%

Revs/Mile
Stock : 0.13%
Forum : 1.91%
New : 0.39%

In conclusion, it looks like 235/40/19 front and 265/35/19 rear are closer to stock ratios than 245/35/19 front and 265/30/19 rear.

Did I do something wrong?
Depends on what your priority is and what you are trying to achieve. If you are trying to get a sidewall height and circumference to match on a "random sized" (non-stock suggested) staggered setup, you have achieved that.

If you are looking to get a bit quicker acceleration, taller side wall and larger circumference will not help (but you already started with your current setup having a slightly taller rear).

If you are looking for a fun canyon carver and/or decent track staggered setup, going to narrower but taller tire will not help, especially in the front.

If you have nice rims, run stiff suspension, and live in a place with many potholes, running taller sidewalls will help.

Just driving your car daily on streets/highways with your setup will work fine.

So again, yes and no, it depends, which are my favorite answers .

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Happy to help with VANOS or any other DIY job around NorCal
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Old Wed, Nov-28-2018, 03:08:36 AM   #547
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Default Re: e46 M3 Tire Sizing Thread

I mainly wanted a taller sidewall because the roads here are unbearable. I do about 2 trackdays a year so my car is mostly optimized for street driving. The point of my post was to show that the tires I got bring the variations closer to stock than what most run.
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Old Tue, Dec-04-2018, 03:29:31 PM   #548
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Question Re: e46 M3 Tire Sizing Thread

I fitted 4pot Brembos.
Had to use a 5mm spacer to clear the calipers and also did a new alignment set the fronts @ -2.5. But i rub on the plastic fender on U turns with 265/35/18 Michelin Pilot Sport 4 and Apex Arc 8 9.5 ET35.
Anyone having similar issue?
Will it be better if i fit 245/40/18? It's a bigger circumference but the 245/40/18 is streched abit (maybe causing some clearance cause i think it rubs on the outside of the tire). I will post some pics of the tire.
Suspension Koni yellow & ACS Springs


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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)