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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 Mon, Oct-22-2018, 01:51:34 PM   #1
burningchrome
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Default Stock tire sizes; why?

So the stock tire size on the rear is 255/35-19, which is pretty small for a 9.5" wide rim. I was at the dealer dreaming of a new M3/4/5 and noticed pretty much all the stock tires were way stretched. Anyone know why BMW does this?
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Old Mon, Oct-22-2018, 02:10:26 PM   #2
Texaz3
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Default Re: Stock tire sizes; why?

Handling?
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Old Mon, Oct-22-2018, 02:37:08 PM   #3
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Default Re: Stock tire sizes; why?

A slight stretch can be a good thing depending on the tire, it helps stiffen up the sidewall a bit.
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Old Mon, Oct-22-2018, 02:57:20 PM   #4
mcfreid
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Default Re: Stock tire sizes; why?

Good question. The CSL has 265s on the same-width rear tire, by the way.
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Old Mon, Oct-22-2018, 03:15:10 PM   #5
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Default Re: Stock tire sizes; why?

With stock power, the 255 is plenty of tire to give car the right amount of grip and slip for dynamic handling. The front 225 gave it some safety understeer as well.

The CSL had a bit more power, a more track oriented suspension geometry and BMW wanted to get the best lap time out of it; therefore, it was given upsized 235/265 Cup tires.
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Old Mon, Oct-22-2018, 03:16:52 PM   #6
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Default Re: Stock tire sizes; why?

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Originally Posted by mcfreid View Post
Good question. The CSL has 265s on the same-width rear tire, by the way.
But lower profile.

255-35-19 for the stock 19s and 265-30-19 for the CSL 19s.
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Old Mon, Oct-22-2018, 05:37:06 PM   #7
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Default Re: Stock tire sizes; why?

Oem stretch feels great to me. I drove with the infamous 245/35 and 275/30 everyone raves about and my car felt mushy as hell.
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Old Mon, Oct-22-2018, 07:17:42 PM   #8
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Default Re: Stock tire sizes; why?

^ ya I currently have 245/275. I'm going with CSL specifications next go around. Pretty sure that'll be my happy medium. 225's did have a little too much understeer for my liking.
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Old Mon, Oct-22-2018, 09:55:05 PM   #9
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Default Re: Stock tire sizes; why?

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Originally Posted by M3_Pilot View Post
^ ya I currently have 245/275. I'm going with CSL specifications next go around. Pretty sure that'll be my happy medium..
Same here, but still have 40% life on my 245/274 MPSSs. Wish I drove more so that I could try the faster setup a little sooner.

Lowering the diameter or circumference also gives a tiny mechanical advantage like gears, along with a little less weight. Again, tiny amounts, but should result in a great feel I think, especially for anyone with 8.5"/9.5" csl rim width sizes like moi.
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Old Mon, Oct-22-2018, 10:07:31 PM   #10
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Default Re: Stock tire sizes; why?

Quote:
Originally Posted by Paulo M View Post
Oem stretch feels great to me. I drove with the infamous 245/35 and 275/30 everyone raves about and my car felt mushy as hell.
I like 245/275 a lot, but I am running wider wheels front and back (8.5 front and 10 rear)
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Discussing Stock tire sizes; why? 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)