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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, 06:05:14 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, 02:26:49 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, 05:54:14 PM   #543
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Default Re: e46 M3 Tire Sizing Thread

Quote:
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, 06:56:22 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 10:34:17 PM.
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Old Tue, Nov-27-2018, 10:41:34 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?
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File Type: png Screen Shot 2018-11-27 at 3.39.49 PM.png (210.2 KB, 42 views)
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Last edited by stogybear; Tue, Nov-27-2018 at 10:50:06 PM.
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Old Wed, Nov-28-2018, 12:38:42 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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All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Wed, Nov-28-2018, 02:08:36 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, 02:29:31 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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Old Wed, Jan-16-2019, 09:58:04 PM   #549
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Default Re: e46 M3 Tire Sizing Thread

Quote:
Originally Posted by SocratesRising View Post
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?
The simple answer is that wider tread always trumps stagger, within reason, of course.

I have 18s, but if I had your 19s, personally, I'd go 255/30/19 in the front. That would give me less sidewall to flex (i.e. - harder sidewall) and more tread on the ground. If there's rubbing, I'd fix it. It's well worth it to me to get the wides possible tires up front to prevent understeer and to increase braking.

Currently, I have 285/35/18s on the rear and I'm about to get the 255/40/18s up front. The wider the better. I don't like boxing (same width tires) in a RWD car because I want the rear of the car to have as much grip as possible since it's so sensitive to trottle input when coming out of a turn. I'll control the front with smaller width tires as long as the rears are good on the turns. So I like your thinking. But I'd go bigger in the front, personally. I've never really been concerned with staggering because the wider I can get the wheel, the more control I'm going to have. So staggering is strictly about me getting the wheel stance as wide as possible, within reason. A slight bit of stagger isn't going to matter enough to make a noticeable or useful enough difference.

However, I'm used to driving a FWD car on the track with 245/45/17s until recently, so people here with more experience driving a RWD M3 can chime in with hands-on experience. Good luck with whatever you choose to go with.
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Old Wed, Jan-23-2019, 02:28:59 PM   #550
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Default Re: e46 M3 Tire Sizing Thread

I recently switched from 245/40-18 F, 275/35-18 R RE-71R tires to 264/35-18 F&R. The fronts are a little pinched on 8.5" ET38 rims but there is no rubbing after a couple of Autocross events, although clearance at the top of the front springs is minimal. The suspension is stock except for Koni yellows and a front adjustable swaybar. This change significantly reduced understeer and improved front grip. I don't really miss the 10mm on the rear tires. My goal was better balance and grip for Autocross.

For street I have OEM 19's with OEM size PS4S. Predictable understeer is the rule when pushed.
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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)