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
      04-10-2013, 08:11 PM   #1
S2000
Private
United_States
19
Rep
97
Posts

Drives: E86 Z4M, E60 M5, E92 M3
Join Date: Dec 2008
Location: Austin TX

iTrader: (1)

Running 275/35/18 square

Just want to share that I was able to fit 275/35/18 NT01 square on Z4M with no rubbing.

Front Wheel is 18x8.5 ET38mm plus 12.5mm spacer, camber -3.5
Rear Wheel is 18x10 ET25mm no spacer, camber -2.5

I know 275 suppose to be mounted on wider than 8.5" wheel but this is an experiment with my existing wheels since I usually run 245/40/18 front with no spacer and 275/35/18 rear with no spacer, but was curious on how 275 will feel in the front.

Despite the obvious "squeezed" look in front, there is no issue with tracking it for 4 track days. Basically, the braking and turn-in improved (less understeer) but steering provides less feedback at the limit and it does not return to center as quickly (may be due change in scrub radius with extra spacer).

It is a trade off....for tight corner it is better , for higher speed (>65mph) corner, I like the 245 front better.

I am going to experiment with 255/35/18 square next since I used up the R-compound in 4 track days and do about 16-20 track days per year so I usually use about 4-5 sets of R -compound per year.

I have learned tire behaviors at limit having tried various tires from R888, NT01, R6, Z214, and have also tried mixed tires such as Hoosier R6 in front and NT01 in rears to reduce mid-corner understeer.
Attached Images
  

Last edited by S2000; 04-10-2013 at 08:48 PM..
Appreciate 0
      04-13-2013, 11:20 AM   #2
nekky
Wagon life
nekky's Avatar
Canada
39
Rep
991
Posts

Drives: '16 328d M Sport Touring
Join Date: May 2011
Location: Vancouver

iTrader: (2)

Thanks for this post! More pictures please and hoping that more info will follow.
Appreciate 0
      04-15-2013, 07:45 PM   #3
Gt4
Captain
Gt4's Avatar
Canada
53
Rep
880
Posts

Drives: 2006 E46 M3 Estoril blue 6mt
Join Date: Jan 2012
Location: Montreal

iTrader: (5)

I had the exact same setup in 2007-2008 on my E46 M3 but I was running Toyo RA-1 275/35r18.

It wasn't that bad but you loose a lot of precision in the steering and it was a little bit unstable during hard braking zone.

It might be a good setup for autoX but not for lapping days.






Appreciate 0
      04-15-2013, 07:55 PM   #4
Kgolf31
Brigadier General
Kgolf31's Avatar
459
Rep
4,531
Posts

Drives: 2007 Z4MC, 2012 128i
Join Date: Sep 2008
Location: Ohio

iTrader: (4)

Quote:
Originally Posted by S2000 View Post
Despite the obvious "squeezed" look in front, there is no issue with tracking it for 4 track days. Basically, the braking and turn-in improved (less understeer) but steering provides less feedback at the limit and it does not return to center as quickly (may be due change in scrub radius with extra spacer).

It is a trade off....for tight corner it is better , for higher speed (>65mph) corner, I like the 245 front better.
The lack of feedback is because you squeezed too much tire on a small wheel. The tire is shimmying back and forth on the wheel before it reaches max grip. So you're losing response in the tire and overall feel.

Lesson learned
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 09:08 AM.




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