F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > 18" Winter F30 ET37
Extreme Powerhouse
Post Reply
 
Thread Tools Search this Thread
      10-17-2013, 11:12 AM   #1
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

18" Winter F30 ET37

25/40/18 18x8.5 x120 +37 offset

Someone plz confirm whether the above is a good fitment all around for 2013 F30 320i x-drive?

Let know asap as Im about to pull the trigger

Thanks
Appreciate 0
      10-17-2013, 12:00 PM   #2
bobblehead
Brigadier General
bobblehead's Avatar
Canada
256
Rep
4,721
Posts

Drives: warp speed
Join Date: Aug 2009
Location: Toronto, On

iTrader: (0)

13mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 13mm

new wheels - 3% too small in overall diameter and speedo will be 3km/hr lower than it really is.

This I would consider to be in the border line area, namely, the lesser front strut clearance. Therefore, if you can do a test fit before buying, then it's better.
Appreciate 0
      10-17-2013, 01:02 PM   #3
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

Detailed info much appreciated.

Thanks
Appreciate 0
      10-17-2013, 01:32 PM   #4
.BMW.
Major General
.BMW.'s Avatar
Sweden
1863
Rep
5,140
Posts

Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

iTrader: (0)

Quote:
Originally Posted by sroghen View Post
25/40/18 18x8.5 x120 +37 offset
Not sure if you mean 225/40-18 or 255/40-18?

255/40-18 is OEM size for F30, 225/40-18 will be 3% short.

Quote:
Originally Posted by bobblehead View Post
13mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 13mm.
I don't agree.

8.5x18" ET37 will have 9mm less inner clearance and extend 3mm on the outside compared to OEM 8x18" ET34.

If compared with staggered 18" M Sport, the rear will looks like a 10mm spacer on M Sport 400 wheels.
Appreciate 0
      10-17-2013, 02:15 PM   #5
bobblehead
Brigadier General
bobblehead's Avatar
Canada
256
Rep
4,721
Posts

Drives: warp speed
Join Date: Aug 2009
Location: Toronto, On

iTrader: (0)

the guy has a 320xdrive. he is going +1 . it comes in 17*7.5 et37 stock.
Appreciate 0
      10-17-2013, 02:40 PM   #6
.BMW.
Major General
.BMW.'s Avatar
Sweden
1863
Rep
5,140
Posts

Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

iTrader: (0)

Sorry, my bad!

My calculations was based on OEM 18" wheels.
Appreciate 0
      10-17-2013, 11:16 PM   #7
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

sorry i meant: 225/40/18

stock on my 320xdrive car came with 225/45/18
Appreciate 0
      10-18-2013, 12:40 AM   #8
.BMW.
Major General
.BMW.'s Avatar
Sweden
1863
Rep
5,140
Posts

Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

iTrader: (0)

Then my calculations are correct after all!

I still don't think 225/40-18 is an optimal choice, they are 3% shorter than OEM and will look a bit stretched on 8.5" wide wheels.

However wider tires can give problems with front strut clearance.
Appreciate 0
      10-18-2013, 07:20 AM   #9
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

Damn, I checked with the seller the wheels are 18x8
Does it make a difference in the calculations above?

(Also, how do you guys come up with the numbers? Is there a chart out there that explains all this?)
Appreciate 0
      10-18-2013, 07:54 AM   #10
bobblehead
Brigadier General
bobblehead's Avatar
Canada
256
Rep
4,721
Posts

Drives: warp speed
Join Date: Aug 2009
Location: Toronto, On

iTrader: (0)

http://1010tires.com/Tools/Wheel-Offset-Calculator

http://1010tires.com/Tools/Tire-Size-Calculator

http://www.willtheyfit.com/
Appreciate 0
      10-18-2013, 09:00 AM   #11
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

Thanks it is very useful.

Besides the speedometer issue, it looks like it may fit fine. Am I correct?
Appreciate 0
      10-18-2013, 10:05 AM   #12
.BMW.
Major General
.BMW.'s Avatar
Sweden
1863
Rep
5,140
Posts

Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

iTrader: (0)

Correct!

The wheels will be fine since you have confirmed that they are 8x18", the only difference compared to OEM is 3mm in offset. That will be hard to notice.

225mm wide tires will fit better on 8" wheels aswell!

There will be a speedometer error and the 40% tire profile (compared to OEM 45%) will increase wheel gap slightly.
Appreciate 0
      10-18-2013, 02:02 PM   #13
sroghen
Enlisted Member
3
Rep
36
Posts

Drives: 320i
Join Date: Dec 2010
Location: toronto

iTrader: (0)

Quote:
Originally Posted by ss0803 View Post
Correct!

The wheels will be fine since you have confirmed that they are 8x18", the only difference compared to OEM is 3mm in offset. That will be hard to notice.

225mm wide tires will fit better on 8" wheels aswell!

There will be a speedometer error and the 40% tire profile (compared to OEM 45%) will increase wheel gap slightly.
Great stuff.
For winter tires, is it anything to worry about the minus 5% tire profile in terms of stability and security. I dont want to compromise security because of child in the car.

Thanks
Appreciate 0
      10-18-2013, 03:41 PM   #14
.BMW.
Major General
.BMW.'s Avatar
Sweden
1863
Rep
5,140
Posts

Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

iTrader: (0)

Generally I would say that higher sidewall is better for a winter tire!

But the difference isn't that large:
225/40-18, sidewall hight 90mm
225/45-18, sidewall hight 101mm

You find some good infomation about winter tires here: tirerack.com
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



All times are GMT -5. The time now is 11:51 PM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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