Tirerack
Use the following links to go directly to useful tirerack winter items: Tirerack Winter Tires. Gary's Winter Tire FAQ.
Using the links directly supports E90Post with tirerack sales commision!

  E90Post
 


TireRack

   PLEASE HELP SUPPORT E90POST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Rolling Diameter Question



Wheels and Tires forum Sponsored by The Tire Rack
Please help to directly support e90post by doing your tirerack shopping from the above link. For every sale made through the link, e90post gets sponsor support to keep the site alive. Disclaimer

Wheel offset calculator courtesy of BimmerPost.com. You may use this calculator to calculate what tire sizes you might need if you upgrade your tires, or what wheel sizes/offsets are compatible with your car.
    Current Wheel Width  inches             Current Wheel Offset  mm.
         New Wheel Width  inches                  New Wheel Offset  mm.
 
TIRE WIDTH
/
ASPECT RATIO
- WHEEL DIAMETER
ORIGINAL TIRES
/
NEW TIRES
/
Based on your stock wheel setup, your new wheel will have:
Original Tires Diameter (in.)
      New Tires Diameter (in.)
  Difference in diameter (in.)
           Percent Difference %
                     
Speedo @60mph will read: mph
Collapse/Expand the BimmerPost Wheel and Tire calculator
Reply
 
Thread Tools Search this Thread
      09-10-2013, 07:50 PM   #1
CrimsonE92
Enlisted Member
 
CrimsonE92's Avatar
 
Drives: E36 M3 Sedan & E92 328xi
Join Date: Nov 2010
Location: Chicago

Posts: 48
iTrader: (1)

Rolling Diameter Question

Hi, I had a quick question. I've been looking into getting a new set of wheels. I have a 07 328xi and from what I have been reading if I want to run a staggered set up I have to make sure the rolling diameter is less than 1%. Now if I have a set of 18s and I run 225/40/18 in the front and 255/35/18 in the rear I know ill be okay, but MY QUESTION is if I have 18s can I run 235/40/18s all around or would my rear tires sidewall have to be less. What are my options? thanks a lot
CrimsonE92 is offline  
0
Reply With Quote
      09-10-2013, 11:34 PM   #2
MonacoBlueE90
Colonel
 
MonacoBlueE90's Avatar
 
Drives: BMW E90 Pre-LCI
Join Date: Jan 2012
Location: Europe

Posts: 2,211
iTrader: (0)

Correct. It's recommended that tyre diameter is under 1% for Xi.
Yes you can use 235/40/18 all round. It would be the best setup for xi, since there is no difference in diameter. Are wheels going to have same width at front and rear? If your rear wheel is wider, might consider going with wider rear tyre.
__________________
MonacoBlueE90 is offline   Finland
0
Reply With Quote
      09-11-2013, 07:54 AM   #3
CrimsonE92
Enlisted Member
 
CrimsonE92's Avatar
 
Drives: E36 M3 Sedan & E92 328xi
Join Date: Nov 2010
Location: Chicago

Posts: 48
iTrader: (1)

Quote:
Originally Posted by MonacoBlueE90 View Post
Correct. It's recommended that tyre diameter is under 1% for Xi.
Yes you can use 235/40/18 all round. It would be the best setup for xi, since there is no difference in diameter. Are wheels going to have same width at front and rear? If your rear wheel is wider, might consider going with wider rear tyre.
Yes I'm planning to have a staggered set up with 8 in the front and 8.5 in the rear.
CrimsonE92 is offline  
0
Reply With Quote
      09-11-2013, 08:19 AM   #4
Patrick719
Lieutenant
 
Patrick719's Avatar
 
Drives: Really Fast
Join Date: Jan 2011
Location: Castle Rock, CO

Posts: 413
iTrader: (2)

Garage List
Send a message via MSN to Patrick719
From the info I've read here from other members and even wheel/tire vendors, the slight height difference on a tire mounted on an 8" wheel vs and 8.5" wheel is minimal and not enough to offset the rolling diameter enough to cause an issue with the awd drivetrain.

Lots of XI owners run square tires on their OEM staggered wheels for winter.
__________________
2010 RRSS Autobiography - #7 resonator delete
2008 335xi Coupe - sold

Patrick719 is offline   United_States
0
Reply With Quote
      09-11-2013, 01:19 PM   #5
VMRWheels
BimmerPost Supporting Vendor

 
VMRWheels's Avatar
 
Drives: BMW
Join Date: Jun 2007
Location: Anaheim, CA

Posts: 12,951
iTrader: (4)

Garage List
2014 BMW F22  [0.00]
2013 BMW F06  [0.00]
2013 BMW F30  [0.00]
Running a 235/40/18 on all four wheels should be fine since the wheels are only 18x8 and 18x8.5 Both of those are within recommended specs for that tire, and won't cause any strain on your drivetrain.
__________________

VMR | Wheels - Mitch A. | 714-442-7916 extension 107 | e. Mitch@velocitymotoring.com
VMRWheels is offline  
0
Reply With Quote
      09-11-2013, 05:54 PM   #6
CrimsonE92
Enlisted Member
 
CrimsonE92's Avatar
 
Drives: E36 M3 Sedan & E92 328xi
Join Date: Nov 2010
Location: Chicago

Posts: 48
iTrader: (1)

thanks a lot guys
CrimsonE92 is offline  
0
Reply With Quote
      09-12-2013, 10:47 AM   #7
Gary@TireRack
Moderator
 
Gary@TireRack's Avatar
 
Drives: Formerly 1995 M3
Join Date: Oct 2006
Location: South Bend, IN, Tire Rack HQ

Posts: 4,387
iTrader: (2)

Quote:
Originally Posted by VMRWheels View Post
Running a 235/40/18 on all four wheels should be fine since the wheels are only 18x8 and 18x8.5 Both of those are within recommended specs for that tire, and won't cause any strain on your drivetrain.
+1, either 225/40R18 or 235/40R18 can be used all around with no problems.

Tires http://www.tirerack.com/a.jsp?a=AH8&...ires/index.jsp
__________________
Gary
Tire and Wheel Forum Moderator. Tire Rack Sales Rep
Gary@Tirerack.com
http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp

Please refer to 'Gary' as your previous contact when you order online.
Gary@TireRack is offline   United_States
0
Reply With Quote
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 02:03 PM.




e90post
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