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      04-25-2011, 07:06 PM   #23
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Quote:
Originally Posted by hwelvaar View Post
Why does BMW sell 1M with different sizes front and rear, and/or why would you run a square setup then?

Just asking to learn...
Some people use the square set up to help reduce understeer. Some use it so they can rotate the tires and maximize their life.

RWD cars with lots of power will usually come with wider rears for added traction.
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      04-25-2011, 08:01 PM   #24
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I think you guys are crazy to consider a square set up on this car when you don't know how much understeer is dialed into the set up from the factory. Everything we have read have indicated that this car is already very twitchy in the rear, so reducing the difference in width to the rear tyre will just make it even more twitchy. To each their own, but I am going to wait and see before committing to a set up.
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      04-27-2011, 03:33 PM   #25
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Weird how this thread didn't even get 1000 views until now.
You'd guess more people would want to know how to track their 1M.
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      05-05-2011, 12:29 AM   #26
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I plan to run 265/35-18 like I did on my e46 M3. I like a square setup so I can rotate. I would worry about going to winter widths i.e. 235. You are obviously not carrying track speeds in Buffalo winters unless you have a death wish.

I sure hope my track wheels fit over the brakes. I have been dealing with Jim at Tirerack since my 1997 M3 days and plan to call him. 265 is a nice size. It is more reasonable, available and plenty wide.

Has anyone used the Toyos or the Dunlops? I am used to the Kuhmo v700s and like a really stiff sidewall. I presently have Re11s for street and have often used Pzeros. At one time in the 90s I had Pzero Corsas but they are not legal for stock in SCCA Solo. They were great. I started in BFG r1 in the early 90s and loved they way they talked to you at the limit.
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      06-22-2011, 01:09 AM   #27
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18x9.5 front and 18x10.5 rear with 265 and 285 tires respectively.
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      06-22-2011, 06:42 AM   #28
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285/35 or 285/40 ?

This car is lowered already, right ?
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      06-22-2011, 07:59 AM   #29
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Quote:
Originally Posted by HP Autowerks View Post
18x9.5 front and 18x10.5 rear with 265 and 285 tires respectively.



Which tires are you running? Michelin Super Sports?

Oooops. Hankooks RS3. Saw that on this thread.

http://www.1addicts.com/forums/showthread.php?t=536206

Last edited by 21450; 06-22-2011 at 08:12 AM.
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      06-22-2011, 06:07 PM   #30
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Quote:
Originally Posted by hwelvaar View Post
Thanks, I played around with that tire size calculator:


Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/km Difference
265/35-19 93mm 334mm 668mm 2099mm 476 0.0% (stock size)
265/35-18 93mm 321mm 643mm 2019mm 495 -3.8%
285/35-18 100mm 328mm 657mm 2063mm 485 -1.7%
295/35-18 103mm 332mm 664mm 2085mm 480 -0.7%
265/40-18 106mm 335mm 669mm 2102mm 476 0.2%
235/40-18 94mm 323mm 645mm 2027mm 493 -3.4%

So indeed you would need 295/35-18 or 265/40-18 to not influence speedometer.
However, the last size (235/40-18) is BMW's recommended winter tire size.
It has -3.4% size compared to stock tires, which is not that diffefent from the 265/35-18 size (-3.8%).

And by checking some online tire shops, I get the impression that 265/35-18 is a more common size than 265/40-18. For example Toyo R888 seems only available in the size 265/35-18.
Thanks! I plan to use the 18" track wheels from my e46 M3 and use the 265/35-18s as soon as I get the wheels up from my son's shop in NC.

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      06-22-2011, 06:11 PM   #31
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Quote:
Originally Posted by hwelvaar View Post
285/35 or 285/40 ?

This car is lowered already, right ?
285/35/18

stock ride height
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      06-24-2011, 09:33 AM   #32
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Is there a conclusion there? I'm getting mine next week and would like track tires but can't choose what rims/tires to fit on?
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      06-24-2011, 12:18 PM   #33
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Quote:
Originally Posted by Slappymangooze View Post
Is there a conclusion there? I'm getting mine next week and would like track tires but can't choose what rims/tires to fit on?
Yes, we sure do.

Have a look here:

http://www.1addicts.com/forums/showthread.php?t=536206

18x9.5 front and 18x10.5 rear with 265 and 285 tires.
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