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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 Fri, May-14-2010, 10:16:04 PM   #41
ClarkeBurns
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Great info as always, Ian. I've learned a lot from what you've written, but what I really want to know is not so much what tire sizes I can run but what works best to achieve neutral handling and reduce the intervention of DSC. I'm only concerned with the street, as I don't track it enough to have that factor in.

I've got old PS2 245s and new V12 275s right now, and I just got a new set of fronts which should improve their grip. Will this setup still understeer significantly? Would a front sway bar help, or is a square setup the only answer?

If square is best (I'm thinking 265s square) what are the downsides for the street? Tramlining is caused by wide front tires (I believe), so could I expect bad tramlining around town?
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Old Sat, May-15-2010, 02:19:36 AM   #42
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Wow I wish I had this info a few months ago when I bought my winter setup! Great thread!
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Old Sat, May-15-2010, 02:35:05 AM   #43
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I think i am at almost exactly at stock diameter running 265/35/19 & 295/30/19.

I constantly change my offsets and tire sizes/types but have not noticed any dcs interference changes.

The e46 m3 does allow for a crab walk type of driving without dcs kicking in which is a good thing for the spirited driver.

Informative thread.

Ps. My tramlining was solved through a neutral toe alignment
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Old Sat, May-15-2010, 02:44:11 AM   #44
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Quote:
Originally Posted by ClarkeBurns View Post
Great info as always, Ian. I've learned a lot from what you've written, but what I really want to know is not so much what tire sizes I can run but what works best to achieve neutral handling and reduce the intervention of DSC. I'm only concerned with the street, as I don't track it enough to have that factor in.

I've got old PS2 245s and new V12 275s right now, and I just got a new set of fronts which should improve their grip. Will this setup still understeer significantly? Would a front sway bar help, or is a square setup the only answer?

If square is best (I'm thinking 265s square) what are the downsides for the street? Tramlining is caused by wide front tires (I believe), so could I expect bad tramlining around town?
For a square street setup, I'd go with 255 square. That has the most sidewall, which is nice in a street setup. You'll get a little more tramlining, but it's not bad with 255s.
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Old Sat, May-15-2010, 01:11:02 PM   #45
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Originally Posted by normcaldwell View Post
Member M3R1 had 255/285 mounted on 8.5 and 9.5 wheels. Maybe the pics in these threads will at least give you some idea about how it looks and handles.
http://www.m3forum.net/m3forum/showthread.php?t=206823
http://www.m3forum.net/m3forum/showthread.php?t=216851

His car was slightly lowered with the Dinan suspension, and he sold the tires not long after he posted the above thread.
I think he was getting a bit of rubbing, but I'm not sure where; probably on the fender, vs inside.
thanks for the post ... what i see is that tire size kind of makes the wheel overall look doughnutty .... that's just what i can see from a distance since they are not close-ups. or it may be the 18" wheel giving that optical illusion ...

my aim was to go with the RG-R wheel, and i kno it's .5" wider in the front. since 225 is already stretched on an 8", the same width on an 8.5 would probably look something like a dub with really wide wheels and narrow tires (nasty).

in the rear, 255 wall has a vertical appearance on the oem 9" wheel...

i don't mind a little slant, but too much looks rediculous and takes away from handling.

so when choosing another size for the front, say 235 or 245, is the diametral difference acceptable as far as the odometer is concerned ?

i would likely go with 245/40 and 265/35 for the 18" RG-R wheel...
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Old Sat, May-15-2010, 07:18:38 PM   #46
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Quote:
Originally Posted by GR///M3 View Post
thanks for the post ... what i see is that tire size kind of makes the wheel overall look doughnutty .... that's just what i can see from a distance since they are not close-ups. or it may be the 18" wheel giving that optical illusion ...

my aim was to go with the RG-R wheel, and i kno it's .5" wider in the front. since 225 is already stretched on an 8", the same width on an 8.5 would probably look something like a dub with really wide wheels and narrow tires (nasty).

in the rear, 255 wall has a vertical appearance on the oem 9" wheel...

i don't mind a little slant, but too much looks rediculous and takes away from handling.

so when choosing another size for the front, say 235 or 245, is the diametral difference acceptable as far as the odometer is concerned ?

i would likely go with 245/40 and 265/35 for the 18" RG-R wheel...
Last year, I had a set of 9" fronts (9x18 ET40) and 9.5" rears (9.5x18 ET28), and ran a 245/40 - 265/35 combo. It felt pretty good; a little more responsive than the 245/40 - 275/35 combo I also ran on the same wheels. For both combo's; no DSC issues, but the odometer will read a bit faster than with the stock size tires. Stock diameters are 26", 245/40 is 25.7", 265/35 is 25.3", 275/35 is 25.6" (for most tires).

My current setup is 8.5x18 ET35 and 9.5x18 ET22, with stock sizes 225/45 and 255/40. I don't think there's too much slant; I think it looks pretty good, and it certainly feels nice and responsive, with less tramlining tendency than with the other combos. I think you could go with any of the 3 combos and be just fine.
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Old Sun, May-16-2010, 12:27:51 AM   #47
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I am certain I want to run a 255/35/19 in the front (rides and handles waaay better than 245/35) and according to this post the best tire size to run will be a 285/30/19, but i rub real bad with that tire size since Ive tried them before. What should I do? I've rolled the fenders twice and it helped a little but i kinda put 2 small dings in the fenders, and turned in the rear camber a bit more (i think to -2) but I dont want to go to much since I want as much traction as possible since boosted. I really like the way my 275/35/19 setup rides right now and it doesnt rub as bad as the 285/30 did, but it has a circumference of 83.5 to go with the 81.8 of the 255/35/19. I think the reason I am getting this rubbing is because my rear wheel is a 10.5" versus a 10". I bet if my rear wheel was a 10" I would be set. Id go back down tho 275/30/19 (80.1 circumference) but that doesnt match the 255/35/19 front either. Suggestions?
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Old Mon, May-17-2010, 12:28:07 AM   #48
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Quote:
Originally Posted by yellowssm View Post
I am certain I want to run a 255/35/19 in the front (rides and handles waaay better than 245/35) and according to this post the best tire size to run will be a 285/30/19, but i rub real bad with that tire size since Ive tried them before. What should I do? I've rolled the fenders twice and it helped a little but i kinda put 2 small dings in the fenders, and turned in the rear camber a bit more (i think to -2) but I dont want to go to much since I want as much traction as possible since boosted. I really like the way my 275/35/19 setup rides right now and it doesnt rub as bad as the 285/30 did, but it has a circumference of 83.5 to go with the 81.8 of the 255/35/19. I think the reason I am getting this rubbing is because my rear wheel is a 10.5" versus a 10". I bet if my rear wheel was a 10" I would be set. Id go back down tho 275/30/19 (80.1 circumference) but that doesnt match the 255/35/19 front either. Suggestions?
less aggressive offsets would fix it.

Short of the... smaller tire
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Old Tue, May-25-2010, 12:19:08 AM   #49
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I have Volk RE30 wheels, 18x8.5" front and 18x9.5" rear.

I was thinking of either getting:

1. 235/40 + 265/35
2. 255/40 square

Any suggestions or comments about these alternatives? Will 255/40 fit on the fronts nicely even though my front wheels have different offset and size compared to the rear?

Also, what about configurations like 245/40 + 255/40 as a compromise between stock and square? Is there anything bad about that?
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Old Tue, May-25-2010, 02:03:41 AM   #50
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would a 265/35/19 rub at the rear?
should be alrite rite?
and only 1.1% difference

i got a set of ps2 from the e92 m3
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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)