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 > Wheel and tire advice please



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
      06-17-2012, 08:59 AM   #1
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,312
iTrader: (11)

Wheel and tire advice please

I am considering purchasing a CPO 09 335 sedan. The used car manager decided to put the sport line wheels from an F 30 on to that car using the original tires. The tire size is 225/45/18 versus the cars original 225/40/18.

I used the Tire Rack calculator and basically what it told me is that the new overall diameter would be nearly 1 inch larger. The calculator then went onto say that at 60 mph The speedometer would be reading 62 mph. I'm a bit confused by this, as my tiny brain leads me to believe that a larger overall tire, at 60 miles an hour would be turning more slowly than the smaller tire and showing a slower reading at 60 mph.

Please help me understand this, as I'm planning to look at the vehicle today and possibly purchase.
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
      06-17-2012, 12:47 PM   #2
notan///m
Colonel
 
notan///m's Avatar
 
Drives: AY F80 (out of the oven)
Join Date: Feb 2012
Location: USA

Posts: 2,021
iTrader: (4)

Garage List
not so sure about that swap... and yeah the sidewalls are thicker on the F30's. Is the F30 wheel setup a staggered one though? Make sure, cuz you don't wanna be running 225's in the back of the 09.
__________________


CCA Member

notan///m is offline  
0
Reply With Quote
      06-17-2012, 02:28 PM   #3
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,312
iTrader: (11)

No, they're not staggered but that's okay for now I can live with it for a few months. I might even sell the wheels shortly too.
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
      06-17-2012, 03:02 PM   #4
bmw325i
Brigadier General
 
Drives: 2006 BMW 325i
Join Date: Oct 2010
Location: United States

Posts: 4,280
iTrader: (5)

The calculator is right, think about it this way the larger diameter tire would cover more distance in one rotation than a smaller tire. I wouldn't worry about it though in fact your speedometer will be more accurate with the larger tires.

What I would worry about is traction with the 225's in the back I don't know whether or not that would be a problem
bmw325i is offline  
0
Reply With Quote
      06-17-2012, 03:32 PM   #5
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,312
iTrader: (11)

I'm gonna see how it all works out. I may sell them too as they fetch a pretty penny on the other board. But they look really nice on an E90 too.

And yes, my speedo should be almost correct now too
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy 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 02:12 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