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      10-31-2017, 01:31 AM   #1
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255/40 R18 Square Winters E92

Anyone know if 255/40/R18 works on the E92 M3?
I am planning to go square size for this winter.

Please let me know if anyone has any experience with this.
My car is not lowered. Just factory suspension for now.
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      10-31-2017, 03:39 AM   #2
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Depends on the wheels. I've run this setup on OEM 219's without a single issue.
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      10-31-2017, 11:08 AM   #3
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I run 255/40/18 and 235/40/18 on stock wheels for winter. Just one step down from stock. My thought was that thinner cuts through snow better and that the tires should be staggered since the wheels are staggered.
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      10-31-2017, 11:33 AM   #4
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Quote:
Originally Posted by Times Like This View Post
Depends on the wheels. I've run this setup on OEM 219's without a single issue.
The wheels are not aggressive one bit. I'm not sure of the offset but I'm sure they are roughly in the 35s.
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      10-31-2017, 03:20 PM   #5
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Quote:
Originally Posted by gordon@ View Post
Anyone know if 255/40/R18 works on the E92 M3?
I am planning to go square size for this winter.

Please let me know if anyone has any experience with this.
My car is not lowered. Just factory suspension for now.
Yup, I don't see why it would be an issue.
I run 225 front and 245 rear on the oem 18's for winter. Works great!
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      10-31-2017, 03:48 PM   #6
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Quote:
Originally Posted by SYT_Shadow View Post
Yup, I don't see why it would be an issue.
I run 225 front and 245 rear on the oem 18's for winter. Works great!
My biggest concern is 255 being too wide for the front and won't clear the liners.
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      10-31-2017, 04:22 PM   #7
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Not too wide for sure, but perhaps too tall. 275/35 fits without much rubbing.

You can't do 255/35 all around?
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      10-31-2017, 05:47 PM   #8
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Quote:
Originally Posted by SYT_Shadow View Post
Not too wide for sure, but perhaps too tall. 275/35 fits without much rubbing.

You can't do 255/35 all around?
Found a deal on 255/40, it was previously installed on a F80. Should be fine no?
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      11-01-2017, 07:59 AM   #9
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Quote:
Originally Posted by gordon@ View Post
Found a deal on 255/40, it was previously installed on a F80. Should be fine no?
the only possible issue you'll have is the total diameter of the tire

Likely is ok though
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      11-02-2017, 07:10 PM   #10
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Quote:
Originally Posted by SYT_Shadow View Post
the only possible issue you'll have is the total diameter of the tire

Likely is ok though
Thanks, SYT. I have a related question:

I plan to run 18x9.5 23mm front wheels on stock ZCP suspension. Do you believe a 255/40/18 tire will fit without issue? TIA.
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      11-02-2017, 07:53 PM   #11
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Quote:
Originally Posted by buddalun View Post
Thanks, SYT. I have a related question:

I plan to run 18x9.5 23mm front wheels on stock ZCP suspension. Do you believe a 255/40/18 tire will fit without issue? TIA.
Not sure but check here too.

http://www.m3post.com/forums/showthread.php?t=1423450
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      11-03-2017, 01:18 PM   #12
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Quote:
Originally Posted by buddalun View Post
Thanks, SYT. I have a related question:

I plan to run 18x9.5 23mm front wheels on stock ZCP suspension. Do you believe a 255/40/18 tire will fit without issue? TIA.
I believe so, yeah. The ET is not that aggressive (may need some camber) but you'll be fine
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      11-03-2017, 01:52 PM   #13
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Does anyone know what the recommended tire pressure for 255/40/18 Square is?
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      11-03-2017, 03:57 PM   #14
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Quote:
Originally Posted by gordon@ View Post
Does anyone know what the recommended tire pressure for 255/40/18 Square is?
The OE Pressure for the factory 245/40/18 is 33 PSI and the OE Pressure for the 265/40/18 is 35 PSI as seen on the door jamb picture, below. I imagine running 35 PSI would be perfectly fine.
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      11-03-2017, 03:58 PM   #15
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Quote:
Originally Posted by SYT_Shadow View Post
I believe so, yeah. The ET is not that aggressive (may need some camber) but you'll be fine
Thanks SYT.

Since I am on sock suspension and cannot dial in much more negative camber, do you think it would work? Planning on using Michelin PSS in 255/40. TIA!
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      11-03-2017, 04:30 PM   #16
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Quote:
Originally Posted by gordon@ View Post
Does anyone know what the recommended tire pressure for 255/40/18 Square is?
I run a good old 35 on all my street cars, front and rear. May not be ideal but it's close to correct and very easy to remember
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      11-03-2017, 04:35 PM   #17
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Quote:
Originally Posted by buddalun View Post
Thanks SYT.

Since I am on sock suspension and cannot dial in much more negative camber, do you think it would work? Planning on using Michelin PSS in 255/40. TIA!
I compared your 255 to the oem tire size for the E92. You're only 1.2% bigger, so you are *perfectly* fine.

Sorry, for some reason I guess I remembered the 19" wheels which have a lower profile than the 18"

I also checked the ET and you're good there as well. OEM has ET29 and you're a tiny bit more aggressive, but OEM also has space for like a 20mm spacer (effectively ET09) so you have tons of room everywhere
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      11-03-2017, 04:35 PM   #18
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Quote:
Originally Posted by SYT_Shadow View Post
I run a good old 35 on all my street cars, front and rear. May not be ideal but it's close to correct and very easy to remember
That's my rule of thumb also. I do 34psi square.
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      11-03-2017, 05:57 PM   #19
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Quote:
Originally Posted by buddalun View Post
The OE Pressure for the factory 245/40/18 is 33 PSI and the OE Pressure for the 265/40/18 is 35 PSI as seen on the door jamb picture, below. I imagine running 35 PSI would be perfectly fine.
Thanks, my doorjam only showed 19" PSI that's why I didn't know what the 18" pressures were.
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      11-03-2017, 08:57 PM   #20
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Quote:
Originally Posted by SYT_Shadow View Post
I compared your 255 to the oem tire size for the E92. You're only 1.2% bigger, so you are *perfectly* fine.

Sorry, for some reason I guess I remembered the 19" wheels which have a lower profile than the 18"

I also checked the ET and you're good there as well. OEM has ET29 and you're a tiny bit more aggressive, but OEM also has space for like a 20mm spacer (effectively ET09) so you have tons of room everywhere
Thank you!
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      11-08-2017, 09:58 PM   #21
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255/40/18 does not work!! It rubs the liner and maybe the cooler too!
When I turn I hear rubbing noises..

Last edited by gordon@; 11-09-2017 at 11:37 AM. Reason: correction*
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      11-09-2017, 09:09 AM   #22
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Why did you run 45 series?
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