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 > Stock E90 325i to 18 M3 Wheels



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
      12-01-2005, 03:07 PM   #1
macknificent
New Member
 
Drives: Sparkling Graphite
Join Date: Nov 2005
Location: Oakland, California

Posts: 15
iTrader: (0)

Garage List
2006 325i  [0.00]
Stock E90 325i to 18 M3 Wheels

I know my stock wheels/tires on my E90 are as follows:

205-55-16 [34mm offset]

and I'm going to get the 18" E46 M3 Staggered Setup which is:

225-45-18 [47mm offset?]
255-40-18 [26mm offset?]

I used the calculator and it says that my speedo will read 63mph @ 60mph. I already know that BMWs tend to have inaccurate speedos to begin with. I'm leasing, so obviously I have a concern if there is a 1.05-1.08% difference (it adds up).

Anyone else have speedo/odometer problems when switching to bigger wheels (especially if you have the M3 setup)?
macknificent is offline  
0
Reply With Quote
      12-01-2005, 05:10 PM   #2
Mark
Administrator
 
Mark's Avatar
 
Drives: 1M
Join Date: Mar 2005
Location: USA

Posts: 3,933
iTrader: (1)

Garage List
Quote:
Originally Posted by macknificent
I know my stock wheels/tires on my E90 are as follows:

205-55-16 [34mm offset]

and I'm going to get the 18" E46 M3 Staggered Setup which is:

225-45-18 [47mm offset?]
255-40-18 [26mm offset?]

I used the calculator and it says that my speedo will read 63mph @ 60mph. I already know that BMWs tend to have inaccurate speedos to begin with. I'm leasing, so obviously I have a concern if there is a 1.05-1.08% difference (it adds up).

Anyone else have speedo/odometer problems when switching to bigger wheels (especially if you have the M3 setup)?
I wouldnt really worry about it since a 1% difference isnt anything statistically significant, you'd probably see more variance on how much air you put in the tires.
__________________
The new beast. BMW M5.
Mark 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 01:58 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