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


Go Back   ZPOST > BMW Z4 Technical Talk > Wheels and Tires
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      05-28-2007, 12:25 PM   #1
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Wheel size...width?

Ok...so help me out. I'm trying to figure out what the effect wheel width is on the car.

The stock M coupe wheels are 8.0 in the front and 9.0 in the rear.

A lot of the after market wheels are 8.5 front and 9.5 rear or bigger. So what happens with .5 in or more extra width. Are there spacers in there that you can take out, or do you just live with tires hanging past the fenders (eww gross).

Enlighten me cuz I'm a retard when it comes to this. I do understand the tire specs and what all the numbers mean, so no need to go there. Thanks

Appreciate 0
      05-28-2007, 01:05 PM   #2
inTgr8r
Lieutenant General
inTgr8r's Avatar
Canada
2422
Rep
11,665
Posts

Drives: M2 Comp
Join Date: Mar 2006
Location: Toronto

iTrader: (10)

Wheel offset
__________________
'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
Appreciate 0
      05-28-2007, 03:43 PM   #3
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Fine...Googling now.
Appreciate 0
      05-28-2007, 03:47 PM   #4
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

After reading about offset, I found myself more confused.......................................... .................................................. ......................................
Appreciate 0
      05-28-2007, 04:32 PM   #5
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Ok...let me know if I'm straight or more confused or less..whatever.

So...basically my wheels are fitted to the car with a certain offset (42 f 30 r, from what I've seen). If I change wheels...I'll likely need a new offset that fits said wheel. And it will probably be different from stock, especially if I get different width wheels. So, in order to fit new wheels to the car you get spacers that accept the bolts on the new wheels from your wheel housing.

How did I do?
Appreciate 0
      05-28-2007, 06:09 PM   #6
z4fun
Registered
z4fun's Avatar
United_States
0
Rep
3
Posts

Drives: 2003 Z4 3.0
Join Date: May 2007
Location: Beavercreek, OH

iTrader: (0)

I've been doing a lot of research on the same subject myself. Someone pointed me to this site, which has everything you cared to know about wheels and tires: http://www.carbibles.com/tyre_bible.html You can also go here for offset information: http://www.1010tires.com/WheelOffsetCalculator.asp Hope this helps you out a bit.
Appreciate 0
      05-28-2007, 06:26 PM   #7
Ski
Hockey freak
Ski's Avatar
United_States
27
Rep
237
Posts

Drives: Bimmer's
Join Date: May 2007
Location: Zaino'd in Binghamton, NY

iTrader: (0)

Quote:
Originally Posted by z4fun View Post
I've been doing a lot of research on the same subject myself. Someone pointed me to this site, which has everything you cared to know about wheels and tires: http://www.carbibles.com/tyre_bible.html You can also go here for offset information: http://www.1010tires.com/WheelOffsetCalculator.asp Hope this helps you out a bit.
Good links, should be threaded on it's own somewhere, or at least a sticky..
__________________

My Jet Black's
'03 3.0i Z4 Loaded
'02 325Ci Loaded
Appreciate 0
      05-28-2007, 07:32 PM   #8
inTgr8r
Lieutenant General
inTgr8r's Avatar
Canada
2422
Rep
11,665
Posts

Drives: M2 Comp
Join Date: Mar 2006
Location: Toronto

iTrader: (10)

Quote:
Originally Posted by Dammmittt View Post
Ok...let me know if I'm straight or more confused or less..whatever.

So...basically my wheels are fitted to the car with a certain offset (42 f 30 r, from what I've seen). If I change wheels...I'll likely need a new offset that fits said wheel. And it will probably be different from stock, especially if I get different width wheels. So, in order to fit new wheels to the car you get spacers that accept the bolts on the new wheels from your wheel housing.

How did I do?
Not bad...
It takes a lot to research to get it right.

Basicaly you position the wheel within the wheel well by selecting an offset to suit.
Start with the OE specs ...then figure max position of where the outside lip should be (eg flush with fender)

On mine I was able to select a wheel with the offset I wanted to bring the wheels flush.
I used NO spacers.
__________________
'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
Appreciate 0
      05-28-2007, 07:44 PM   #9
takedown8
Major
takedown8's Avatar
United_States
56
Rep
1,068
Posts

Drives: 2005 BMW Z4 3.0i
Join Date: May 2007
Location: Seattle, WA

iTrader: (0)

Shouldn't any wheel store that you're planning on buying from be able to confirm that they'll fit on your car and whether or not you'll need spacers? I'd rather depend on them 'cause if they're wrong, then they have to fix things.
Appreciate 0
      05-28-2007, 08:02 PM   #10
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

True, but I don't want to depend on people too much. If I know what's goin on ahead of time I can tell if they are trying to screw me.
Appreciate 0
      05-28-2007, 08:05 PM   #11
takedown8
Major
takedown8's Avatar
United_States
56
Rep
1,068
Posts

Drives: 2005 BMW Z4 3.0i
Join Date: May 2007
Location: Seattle, WA

iTrader: (0)

Yeah, but if you get it wrong, then they'll blame you. Then you'll really be screwed.
Appreciate 0
      05-28-2007, 08:28 PM   #12
inTgr8r
Lieutenant General
inTgr8r's Avatar
Canada
2422
Rep
11,665
Posts

Drives: M2 Comp
Join Date: Mar 2006
Location: Toronto

iTrader: (10)

Quote:
Originally Posted by takedown8 View Post
Shouldn't any wheel store that you're planning on buying from be able to confirm that they'll fit on your car and whether or not you'll need spacers? I'd rather depend on them 'cause if they're wrong, then they have to fix things.
Absolutely NOT.
Same as buying your car;
Did you do your own research or just believe the CA?
__________________
'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
Appreciate 0
      05-28-2007, 11:01 PM   #13
takedown8
Major
takedown8's Avatar
United_States
56
Rep
1,068
Posts

Drives: 2005 BMW Z4 3.0i
Join Date: May 2007
Location: Seattle, WA

iTrader: (0)

Quote:
Originally Posted by inTgr8r View Post
Absolutely NOT.
Same as buying your car;
Did you do your own research or just believe the CA?
You should definitely do research, but I wouldn't order anything without making sure that they confirm that the wheels will fit your car. That's all. I don't think buying wheels is anywhere as complex or requires close to as much research as buying a car. Don't give me that guff, inTgr8r!
Appreciate 0
      05-29-2007, 06:48 AM   #14
inTgr8r
Lieutenant General
inTgr8r's Avatar
Canada
2422
Rep
11,665
Posts

Drives: M2 Comp
Join Date: Mar 2006
Location: Toronto

iTrader: (10)

"Don't give me that guff, inTgr8r!" ... Ouch -

Yeah for sure listen to the wheel guys.....
BUT, take it with a grain of salt.
Most of them are just looking up a fitment data sheet.

Very few have any real experience fitting our cars.
I talked to some that had no clue that the M was a different fitment than the 3.0

One thing I did, was look for everyone I could find that had "been there, done that" & got their specs.
When I ordered my Volks, the wheel shop was going with far more conservative offsets than what I knew would fit.
BUT, I agree... if a shop says "they won't fit, we don't guarantee" ....don't do it.

One thing that can really screw things up are manufacturers (eg iForged) that refuse to disclose fitment data.
I know one guy that went with iForged, who had a bad fitment issue on an E92.
They gave him all kinds of grief - "your using the wrong tires" etc.....

The absolute best way to get the right setup is to get trial fitment from a local wheel shop.
I've had some seriously wheels on cars to get a trial fitment.
__________________
'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)

Last edited by inTgr8r; 05-29-2007 at 09:31 AM..
Appreciate 0
      05-29-2007, 09:23 AM   #15
zednik
Private First Class
zednik's Avatar
8
Rep
191
Posts

Drives: 2006 Z4 3.0i
Join Date: May 2007
Location: San Diego, California

iTrader: (0)

Indeed, offset is critical and it can be difficult to get good information. When I was looking for CSL style wheels for my car Tom at European Auto Source had the straight info on what would fit properly.
Appreciate 0
      05-29-2007, 09:58 AM   #16
takedown8
Major
takedown8's Avatar
United_States
56
Rep
1,068
Posts

Drives: 2005 BMW Z4 3.0i
Join Date: May 2007
Location: Seattle, WA

iTrader: (0)

That's fabulous advice, Intgr8r!
Appreciate 0
      05-29-2007, 06:43 PM   #17
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Thanks int. I have a much better feeling about it for when I do get some new wheels. I'm probably just going to get them for the NE winter and put winter tires on them and keep the contis on my stock rims. Or I may do it the other way. I just want to make sure I know what people are talking about so I don't look or feel like a retard.

Research is always key. And I research pretty much everything that requires me to spend money
Appreciate 0
      05-29-2007, 07:22 PM   #18
ovrkll
Lieutenant
ovrkll's Avatar
8
Rep
412
Posts

Drives: Interlagos Blue Z4M
Join Date: May 2007
Location: McDonough, GA

iTrader: (0)

^^ You really have no idea how hard it is not to respond to this post!!


But I will give Dammmitt a break since he is still in the Army.
Appreciate 0
      05-29-2007, 07:44 PM   #19
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

WHAT?!?!?! Let it out man
Appreciate 0
      05-29-2007, 07:55 PM   #20
ovrkll
Lieutenant
ovrkll's Avatar
8
Rep
412
Posts

Drives: Interlagos Blue Z4M
Join Date: May 2007
Location: McDonough, GA

iTrader: (0)

The moment passed, I was going to hijack the thread and make it an Army vs. Navy thread, but I will let the thread continue its merry way.
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 06:50 PM.




zpost
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