BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Wheels + Tires Sponsored by The Tire Rack
  TireRack

KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK!
Post Reply
 
Thread Tools Search this Thread
      11-09-2012, 01:00 PM   #1
ERinEC
Private First Class
3

 
Drives: '11 AW E92 M3
Join Date: May 2012
Location: MD


Posts: 169
iTrader: (0)

How Much Gap Up Front With 235/40 18 Tires?

I'm considering picking up a used winter setup that consists of VMR VB3 wheels with the fronts as 18 x 8.5, ET20, with Dunlop SP Wintersport 3Ds size 235/40. This is for my '11 E92 M3.

Will there be a big gap between the tire and fender up front? I know this is just a winter setup, but I'm fearful the gap will be too much for me.

Are people typically going 245/40 for an 18 x 8.5" winter setup?
Appreciate 0
      11-09-2012, 01:07 PM   #2
M3SQRD
Colonel
United_States
24

 
M3SQRD's Avatar
 
Drives: E92 M3s, R56 Cooper S
Join Date: Jun 2009
Location: EC


Posts: 2,479
iTrader: (2)

The stock 245/40-18 PS2 has a rolling diameter of 25.7". The 235/40-18 3D has a rolling diameter of 25.4" so the fender-to-wheel gap increases by ~0.15".

BMW M3 270M winter wheels are 18x8"et20 and they recommend running a square 235/40-18 winter tire setup.

Last edited by M3SQRD; 11-10-2012 at 07:06 AM. Reason: Typo
Appreciate 0
      11-09-2012, 02:21 PM   #3
ERinEC
Private First Class
3

 
Drives: '11 AW E92 M3
Join Date: May 2012
Location: MD


Posts: 169
iTrader: (0)

Quote:
Originally Posted by M3SQRD View Post
The stock 245/40-18 PS2 has a rolling diameter of 25.7". The 235/40-18 3D has a rolling diameter of 25.4" so the fender-to-wheel gap increases by ~0.15".

BMW M3 270M winter wheels are 18x8"et20 and they recommend running a square 245/40-18 winter tire setup.
Okay, thanks.

Not sure if it makes a difference, but I also have comp package.
Appreciate 0
      11-09-2012, 02:35 PM   #4
M3SQRD
Colonel
United_States
24

 
M3SQRD's Avatar
 
Drives: E92 M3s, R56 Cooper S
Join Date: Jun 2009
Location: EC


Posts: 2,479
iTrader: (2)

Quote:
Originally Posted by ERinEC View Post
Okay, thanks.

Not sure if it makes a difference, but I also have comp package.
No, the rolling diameter of the 245/35-19 and 245/40-18 are the same so comp vs non-comp doesn't make a difference
Appreciate 0
      11-09-2012, 02:43 PM   #5
M3PO
Colonel
32

 
M3PO's Avatar
 
Drives: '08 IB E92
Join Date: Sep 2011
Location: OC


Posts: 2,753
iTrader: (7)

The rolling diameter won't be much different. Regarding the wheel width/offset and tire width, you comp wheels are 19x9 +31. These VMR's will be about 3mm more aggressive (9mm further out from offset plus 6mm sunk in due to narrower width equals 3mm more aggressive).

If you are running the recommended 245 width summer tire on your ZCP wheels, the new tires will be 10 mm narrower meaning that the shoulder of the tire will be sunken in or stretched by 5mm.

Combine this 5mm sunken in (tire) with 3mm pushed out from above (wheel) and you end up 2mm sunken in, virtually no change. Of course, tire widths are supposed to be standard but some tires run wider than others but this estimate should be very close.
__________________
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R
Appreciate 0
      11-09-2012, 02:53 PM   #6
Transfer
Lieutenant Colonel
United_States
24

 
Transfer's Avatar
 
Drives: SQ5, X1
Join Date: Mar 2010
Location: Seattle, WA


Posts: 1,688
iTrader: (0)

Quote:
Originally Posted by ERinEC View Post
Are people typically going 245/40 for an 18 x 8.5" winter setup?
245/40/18 would be a better fit for the wheel and suspension/fenders IMO but 235/40 is acceptable. The OEM winter package is 235/40 on 18x8 et20. With either size, you will likely want spacers (~15mm) at least in the rear.

I'm using 245/40, 18x8, et20 with 12mm spacer in the rear and it looks great.
Appreciate 0
      11-09-2012, 03:32 PM   #7
slicer
Brigadier General
54

 
slicer's Avatar
 
Drives: '13 E92 M3
Join Date: Jan 2009
Location: San Diego, CA


Posts: 3,883
iTrader: (19)

Too much!
__________________
ALL PARTS FOR SALE (click links) -
KW Clubsport 3-way, Akrapovic Evolution, Mode Carbon GTS Wing, BBS E05 (18x10/11), BMW Pedals Billet Extended DCT Paddles, Advan TC3 (9.5/10.5), Recaro Profi-XL & Planted Seat Brackets
Appreciate 0
      11-09-2012, 03:59 PM   #8
ERinEC
Private First Class
3

 
Drives: '11 AW E92 M3
Join Date: May 2012
Location: MD


Posts: 169
iTrader: (0)

Quote:
Originally Posted by Transfer View Post
245/40/18 would be a better fit for the wheel and suspension/fenders IMO but 235/40 is acceptable. The OEM winter package is 235/40 on 18x8 et20. With either size, you will likely want spacers (~15mm) at least in the rear.

I'm using 245/40, 18x8, et20 with 12mm spacer in the rear and it looks great.
Thanks for everyone's input.

I probably should have been more specific, as the wheel/tire package I'm considering is 18 x 8.5", ET20, 235/40 up front, and 18 x 9.5, ET22, 255/40 for the rears.

This post shows something similar, and it appears there is a lot of fender gap up front which I'm trying to avoid:

http://www.m3post.com/forums/showthread.php?t=767902

However, since I have comp package, wouldn't the gap be just a tad less?
Appreciate 0
      11-09-2012, 03:59 PM   #9
BMW Fanatic
Banned
Canada
60

 
Drives: slow
Join Date: Jul 2009
Location: Calgary


Posts: 3,314
iTrader: (11)

OEM winter set is actually 18x8 et20 - 235/40/18 all around. I don't have an OEM set for winter but my aftermarket set is the same spec and people might bag on your for running thin tires or whatever but 2 things to remember; 1) safety FIRST. 2) you're driving an M3.
Appreciate 0
      11-09-2012, 04:42 PM   #10
Transfer
Lieutenant Colonel
United_States
24

 
Transfer's Avatar
 
Drives: SQ5, X1
Join Date: Mar 2010
Location: Seattle, WA


Posts: 1,688
iTrader: (0)

If you're going with staggered 235f, 255r then I think you have the sizing right and your comp package will reduce the gap by 1cm compared to non-comp. I debated the staggered setup and I'm glad I went mid-width square but your plan is good too.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 02:34 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST