New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > 2009-Current Z4 Forum (E89) General Discussion

Post Reply
 
Thread Tools Search this Thread
      05-06-2013, 09:00 PM   #23
nicknaz
Lieutenant General
nicknaz's Avatar
3183
Rep
10,509
Posts

Drives: C6Z
Join Date: May 2008
Location: NorCal

iTrader: (0)

I had a set of Bridgestone LM-22 winter RFT in a 205/55/16 size on my 328 (it was the factory recommended winter tire setup, similar to how the pirellis are for your car) that saw about 4 winters and 20k miles and it still had 8/32" in tread left over. Definitely, I agree your wear is premature

Some other posters didn't read the full thread. OP is using factory recommended RFT so the owner's manual pressures should absolutely apply.

Interesting that your door panel sticker has a different tire pressure recommendation for that tire size than what is in the latest E89 owner's manual I downloaded from the bmwusa website....
Appreciate 0
      05-07-2013, 08:16 AM   #24
teagueAMX
Colonel
teagueAMX's Avatar
United_States
60
Rep
2,087
Posts

Drives: Some are road worthy
Join Date: Apr 2009
Location: So Cal, USA

iTrader: (0)

Quote:
Originally Posted by tranquility View Post
I definitely will when I go in to replace those bald tires. Just wondering if anyone could shed some light on these crazy tires lol.

Ok, so the consensus appears to try for lower PSI. If the tire was conVEX, does that mean it would be under-inflated?

I always check pressure/pump tires when the tires are at rest for a long time...not sure as a poster stated above that I may have set the 'correct' pressure during such time, but when I actually drive out it is to a warmer environment, so that causes the over-inflating?
The problem is over inflation. This is because tire air pressure causes the center (more flexible) section of the tread to bulge out slightly when the tire warms to normal operating temp.

I find that huge swings in temps during the day will significantly affect tire pressure. Example: Checking pressure early when tires are very cold when actual driving conditions are warm/sunny. I realize we're talking about winter tires but "warm winter" conditions could contribute to this problem.

Here's a link that may help ----> HOW TO READ TIRE WEAR
__________________
"Political correctness is a doctrine fostered by a delusional liberal minority and rabidly promoted by an unscrupulous mainstream media which holds forth the proposition that it is entirely possible to pick up a turd by the clean end".-- Unknown

Appreciate 0
      05-07-2013, 02:16 PM   #25
tranquility
sportscars only
tranquility's Avatar
Canada
3196
Rep
3,190
Posts

Drives: 2011 Z4 sDrive 35i
Join Date: Aug 2007
Location: Montréal

iTrader: (0)

Quote:
Originally Posted by teagueAMX View Post
The problem is over inflation. This is because tire air pressure causes the center (more flexible) section of the tread to bulge out slightly when the tire warms to normal operating temp.

I find that huge swings in temps during the day will significantly affect tire pressure. Example: Checking pressure early when tires are very cold when actual driving conditions are warm/sunny. I realize we're talking about winter tires but "warm winter" conditions could contribute to this problem.

Here's a link that may help ----> HOW TO READ TIRE WEAR
Thx, Lion King! I now remember that you gave me that link before, but I have the memory of a gnat lol. Thx also for explaining why it looks like over-inflation.

Sigh, oh well, need to spend more $$$ on 2 new tires now.

EDIT: only comment on what is best re tire swapping? Thx, King of the Jungle.
Appreciate 0
      05-07-2013, 11:25 PM   #26
teagueAMX
Colonel
teagueAMX's Avatar
United_States
60
Rep
2,087
Posts

Drives: Some are road worthy
Join Date: Apr 2009
Location: So Cal, USA

iTrader: (0)

Quote:
Originally Posted by tranquility View Post
Thx, Lion King! I now remember that you gave me that link before, but I have the memory of a gnat lol. Thx also for explaining why it looks like over-inflation.

Sigh, oh well, need to spend more $$$ on 2 new tires now.

EDIT: only comment on what is best re tire swapping? Thx, King of the Jungle.
I'm glad to be of assistance, although others here mentioned the same info.

Today it's difficult to rotate your tires due to directional tread designs and staggered f/r wheel and tire sizes/profiles. As others have suggested, it's possible if you have a "square" f/r tire sizes/profiles. You can change f/r on the same side or even an "X" pattern (f/r + l/r). It really extends tire life but some tires take on a left or right bias after a few thousand miles. So a simple f/r is pretty good.

FWIW

Cheers
__________________
"Political correctness is a doctrine fostered by a delusional liberal minority and rabidly promoted by an unscrupulous mainstream media which holds forth the proposition that it is entirely possible to pick up a turd by the clean end".-- Unknown

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 08:02 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