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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 07-21-2013, 02:57 PM
rsk rsk is offline
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Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
Z4 : Tire & wheel suggestion

Hi Group

I have a 2007 Z4 3.0i with stock RF tires and wheels. I am looking to change both the wheels and tires. My stock tire size is

Front: 255/45/17
Rear: 255/40/17

Can you pls hep me with the following

Tires Question
- To get a smooth ride which non RF tire would you suggest, Continental DW or Hankook v12.

Wheels Questions
- Should I go for staggered wheels or same size for all four.
- Instead of 17" should I go for 18" wheels.

Pls note that my requirement is to get a smooth ride and not to lower the car anymore.
I am not very familiar with wheels sizes and their impact on the ride and hence all these questions. Pls note I have read quite a few threads on the subject and still could not make a decision. Any help is appreciated.

rsk

Last edited by rsk; 07-21-2013 at 07:01 PM.
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  #2  
Old 07-22-2013, 05:44 AM
dougmcintyre dougmcintyre is offline
formerly updmst
Location: Chapel Hill, NC
 
Join Date: Sep 2009
Posts: 661
Mein Auto: 2000 M Coupe, 1997 318ti
Based on https://www.tirerack.com/tires/tests...y.jsp?ttid=148 and https://www.tirerack.com/tires/tests...y.jsp?ttid=149, for the best ride, I would go with the DW's. But, if you really want the best possible ride, you should look at the Grand Touring tires (https://www.tirerack.com/tires/tests...ay.jsp?ttid=27 and https://www.tirerack.com/tires/tests...y.jsp?ttid=171).

Larger wheels means shorter and stiffer sidewalls. The ride is going to suffer. See http://www.caranddriver.com/features...d-tires-tested

Rather than spending money on wheels, you should investigate upgrading the suspension. At least on the Z3's, the TC Kline SA and DA suspensions are known to improve both the ride and the handling over stock. Call TC Kline (614-771-7744) for their recommendations for your needs.

Last edited by dougmcintyre; 07-22-2013 at 07:08 AM.
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  #3  
Old 07-22-2013, 10:59 AM
pokeybritches pokeybritches is offline
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Posts: 177
Mein Auto: 06 Z4MR, 03 Z4 3.0i
Why are you looking to change the wheels? Lighter weight for better performance, or looks?
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  #4  
Old 07-22-2013, 12:41 PM
rsk rsk is offline
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Location: Seattle
 
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Posts: 135
Mein Auto: 325i
Thanks for your responses guys. I am looking to change the wheels for looks. I am looking at the following specs for the wheels and tires

TSW Valencia all matte black wheels
F : 18x8
R : 18x9.5

Tires - Conti Extremecontact DW
F : 225/40/18
R : 255/35/18

Opinions pls.

Thanks
rsk
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  #5  
Old 07-23-2013, 08:12 AM
keeton keeton is offline
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Location: Atlanta, GA
 
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Mein Auto: '07 3.0si
If ride is your priority, stick with the stock 17" wheel size - even if you change the wheels. The taller sidewall will provide a better ride.
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  #6  
Old 07-23-2013, 12:38 PM
rsk rsk is offline
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Quote:
Originally Posted by keeton View Post
If ride is your priority, stick with the stock 17" wheel size - even if you change the wheels. The taller sidewall will provide a better ride.
yeah, i thought about it but there are not many wheels out there that come staggered in 17" and hence i had to got for 18".

Thanks
rsk
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  #7  
Old 07-23-2013, 04:04 PM
pelerojo pelerojo is offline
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Location: charlotte nc
 
Join Date: Oct 2009
Posts: 93
Mein Auto: Z4MR
The post facelift 3.0 sport package came with 17" staggered wheels. I have seen a few sets for sale.
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  #8  
Old 07-24-2013, 07:38 PM
pokeybritches pokeybritches is offline
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Location: Gulf Coast
 
Join Date: Jan 2008
Posts: 177
Mein Auto: 06 Z4MR, 03 Z4 3.0i
Quote:
Originally Posted by rsk View Post
Thanks for your responses guys. I am looking to change the wheels for looks. I am looking at the following specs for the wheels and tires

TSW Valencia all matte black wheels
F : 18x8
R : 18x9.5

Tires - Conti Extremecontact DW
F : 225/40/18
R : 255/35/18

Opinions pls.

Thanks
rsk
What are the offsets of the TSW's?

Apex make great wheels too. www.apexraceparts.com
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  #9  
Old 07-27-2013, 05:51 AM
Tony Amos Tony Amos is offline
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Location: Kent
 
Join Date: Jun 2013
Posts: 7
Mein Auto: BMW Z4 2.5 SI Sport 2007
Z4 wheels and tyres

Deeper sidewalls give smoother ride, best to try to stick with 17". Have just fitted Kumho Ecsta Le Sport KU39 non run flat to my 2.5 SI Sport. Great improvement over Bridgestone run flats, and that is with lower profile 18" wheels. Good luck.
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  #10  
Old 07-29-2013, 04:06 AM
STIHLBOLTS STIHLBOLTS is offline
Hat's On, Tops Down!
Location: Georiga
 
Join Date: Feb 2008
Posts: 1,021
Mein Auto: 2008 Z4MR


8.5 x 18 / 9.5 x 18 Apex Wheel.

You can put stock size that you showed with no issues on the car, I run 245/40/18 and 275/35/18 Michelin Pilot Super Sports. Expensive tire but worth the money. The DW's are a better tire than the Hankook's unless you want to do a lot of track driving. Better all around service with the DW's. But if you want to do the best, go with Michelin.

Regards
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  #11  
Old 07-29-2013, 02:50 PM
TennesseeZ4 TennesseeZ4 is offline
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Location: Franklin, TN
 
Join Date: Sep 2012
Posts: 78
Mein Auto: 2003 Z4 3.0: six speed
Michelin Pilot SS

I would agree with the comments from Stihlbolts. I just made the move to the Pilot SS about a month ago, and cannot believe the transformation that these tires have made to the Z4. I have the sport suspension with the staggered wheel size and tire size, but WOW, do these tires ride and perform. There may well be others that match the SS, but I am way impressed with the change in my car's behavior.
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  #12  
Old 07-30-2013, 02:48 PM
tonywintn tonywintn is offline
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Location: Tennessee
 
Join Date: Jun 2009
Posts: 187
Mein Auto: 2005 BMW X5 & 2007 Z4 si
I put the Hankook V12s on my Z last Winter. At first I wasn't sure I would like them; but they were in their element once the summer weather came and I am more than satisfied. No more RFTs for me.
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