Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 F25 (2011 - current)

X3 F25 (2011 - current)
The latest X3 brings added style and new features to the BMW's mid-sized SUV. Talk about the BMW F25 X3 with other X3 owners now!

Reply
 
Thread Tools Display Modes
  #1  
Old 03-25-2016, 01:43 PM
wbarnum wbarnum is offline
Registered User
Location: Chicago
 
Join Date: Feb 2016
Posts: 3
Mein Auto: Infiniti G37x
Mismatched Front/Back Tires

Was at Discount Tire today pricing out some tires for my wife's 2011 BMW X3.

The assistant manager told me two things and I wanted to check on their validity:

1. You don't want to have mismatched front and rear tires on an AWD vehicle, or it could cause problems with the drivetrain.

2. You don't want to have front and rear tires with more than 2/32 difference in tread on an AWD vehicle, or it could cause problems with the drivetrain.

Thanks in advance for any feedback.
Reply With Quote
Advertisement
  #2  
Old 03-25-2016, 01:53 PM
pgold1230 pgold1230 is offline
Officially Welcomed to the 'Fest
Location: Suburban Philadelphia
 
Join Date: Dec 2014
Posts: 275
Mein Auto: 2013 x3 M-sport 3.5i
Don't know how valid the second point is, but from what I've read, you don't want mismatched tires (size-wise) on an AWD vehicle. It really can screw up the drivetrain.
__________________

Phil G.

2016 BMW 340i M-Sport xDrive Mineral Grey/Oyster
2016 Porsche Boxster S (6MT) GT Silver/Black
2013 BMW x3 M-sport 3.5i x-drive Space Grey/Black
2009 BMW 328i xDrive (traded) Space Grey/Oyster
Reply With Quote
  #3  
Old 03-25-2016, 06:18 PM
mikeglenn mikeglenn is offline
Officially Welcomed to the 'Fest
Location: Ohio
 
Join Date: Sep 2003
Posts: 126
Mein Auto: BMW 535i BMW X3
The following threads may be of interest with regards to size differences in tires tolerated by BMW's xDrive and the importance of matching tires on AWD vehicles.

http://www.tirerack.com/tires/tirete....jsp?techid=18

http://www.bimmerfest.com/forums/sho...d.php?t=618970

https://www.bmwcca.org/forum/index.p...e-xdrive.6101/
Reply With Quote
  #4  
Old 03-25-2016, 06:53 PM
wbarnum wbarnum is offline
Registered User
Location: Chicago
 
Join Date: Feb 2016
Posts: 3
Mein Auto: Infiniti G37x
Quote:
Originally Posted by mikeglenn View Post
The following threads may be of interest with regards to size differences in tires tolerated by BMW's xDrive and the importance of matching tires on AWD vehicles.

http://www.tirerack.com/tires/tirete....jsp?techid=18

http://www.bimmerfest.com/forums/sho...d.php?t=618970

https://www.bmwcca.org/forum/index.p...e-xdrive.6101/
Thanks for the information. That is very helpful
Reply With Quote
  #5  
Old 03-26-2016, 10:58 AM
/dev/null /dev/null is offline
Officially Welcomed to the 'Fest
Location: Arizona
 
Join Date: Dec 2015
Posts: 401
Mein Auto: 2014 X3 F25 xDrive 28i
The first statement is certainly true. Having the same tire size is important. I've also been told at a Discount Tire that if you have two sets of tires, one with deeper treads, that the deeper treads should go on the front. The depth mismatch probably comes from the diameter of the tires being affected by how much wear there is so if some are worn more than others, the diameter is of course affected, By how much that really is before it matters, that's harder to say. Will have to look myself at the articles referenced above. Discount has shuffled tires for me with somewhat different tread depths on AWD vehicles before and not mentioned this.
__________________
Current:
2014 BMW X3 x28i
Previous:
2013 BMW X3 x28i || 2012 Subaru Impreza Outback Sport
2005 Toyota RAV4 || 2002 Dodge Durango
1988 Toyota 4Runner || 1978 Saab 99 Turbo
1974 Volvo 442 || 1971 Saab 99
1969 Jaguar E-Type (XKE) drophead coupe
1967 Mustang || 1966 Jaguar Mk II
Reply With Quote
  #6  
Old 03-26-2016, 04:16 PM
mikeglenn mikeglenn is offline
Officially Welcomed to the 'Fest
Location: Ohio
 
Join Date: Sep 2003
Posts: 126
Mein Auto: BMW 535i BMW X3
Quote:
Originally Posted by /dev/null View Post
I've also been told at a Discount Tire that if you have two sets of tires, one with deeper treads, that the deeper treads should go on the front.
I was told at my local Discount Tire to always put the newer tires with deeper treads on the rear. This same advice to mount tires with deeper treads on the rear of the vehicle appears at several other reputable sources.

http://www.tirerack.com/winter/tech/....jsp?techid=52

"When tires are replaced in pairs in situations like these, the new tires should always be installed on the rear axle and the partially worn tires moved to the front. New tires on the rear axle help the driver more easily maintain control on wet roads since deeper treaded tires are better at resisting hydroplaning."

http://www.popularmechanics.com/cars...nked-10031440/

"Rear tires provide stability, and without stability, steering or braking on a wet or even damp surface might cause a spin. If you have new tires up front, they will easily disperse water while the half-worn rears will go surfing: The water will literally lift the worn rear tires off the road. If you're in a slight corner or on a crowned road, the car will spin out so fast you won't be able to say, "Oh, fudge!" There is no "even if" to this one. Whether you own a front-, rear- or all-wheel-drive car, truck, or SUV, the tires with the most tread go on the rear. "
Reply With Quote
  #7  
Old 03-28-2016, 05:55 AM
jman103099's Avatar
jman103099 jman103099 is offline
Officially Welcomed to the 'Fest
Location: Central IL
 
Join Date: Jun 2006
Posts: 375
Mein Auto: f25 X3 e90 328i e46 330ci
There were lots of posts in the e83 X3 forums about this... replace all four at the same time. It seems like size mis-match can do some serious damage to the X-drive (transfer case especially if I recall).
__________________
2004 330CiC (8/15 - present)
2011 X3 28i (1/12 - present)
2011 328i (5/11 - present)
2009 MINI Cooper (4/09 - 5/11)
2006 X3 (03/07 - 1/12)
1995 325i (05/06 - 3/09)
1985 325e (08/00 - 12/04)
Reply With Quote
  #8  
Old 03-28-2016, 07:11 AM
Doug Huffman's Avatar
Doug Huffman Doug Huffman is offline
Nuclear engineer
Location: Washington Island, Wisconsin, thru Death's Door
 
Join Date: Apr 2015
Posts: 2,259
Mein Auto: 2012 X5 35d (E70)
XDrive does not use/have a center differential but only the TC which multi-plate wet clutch will tolerate limited slip as it maintains the F .4/R .6 torque split under the control of DSC/DTC via the actuator. Different tire diameters cause continuous speed difference in the clutch.
__________________
Post hoc ergo propter hoc is a weak logic akin to arguing from ignorance, "I don't know, but ..." Better to be silent and thought a fool than to babble and remove all doubt.
Reply With Quote
  #9  
Old 04-03-2016, 06:53 PM
tobandals tobandals is offline
Love My Bimmer
Location: North Carolina
 
Join Date: Apr 2004
Posts: 57
Mein Auto: '12 Z4 & '13 X3
Interesting thread. I have a 2013 35i X3 sport package, and it eats tires for lunch! At 13K the back tires were shot, so put new matching tires on rear. Then at 36K put new tires all round. Now at 47K my rears are shot again, and thinking I would put new matching tires on the back again. Am I hurting the drivetrain doing this? I wear out tires like no tomorrow, and they are darned expensive to be replacing every 15K or so. Do others on this forum have the same experience, and what do you do? Each time I have put OEM size on (245/45-19).
Reply With Quote
  #10  
Old 04-04-2016, 08:04 AM
jman103099's Avatar
jman103099 jman103099 is offline
Officially Welcomed to the 'Fest
Location: Central IL
 
Join Date: Jun 2006
Posts: 375
Mein Auto: f25 X3 e90 328i e46 330ci
Quote:
Originally Posted by tobandals View Post
Interesting thread. I have a 2013 35i X3 sport package, and it eats tires for lunch! At 13K the back tires were shot, so put new matching tires on rear. Then at 36K put new tires all round. Now at 47K my rears are shot again, and thinking I would put new matching tires on the back again. Am I hurting the drivetrain doing this? I wear out tires like no tomorrow, and they are darned expensive to be replacing every 15K or so. Do others on this forum have the same experience, and what do you do? Each time I have put OEM size on (245/45-19).
I couldn't believe it when I needed new tires at 24k miles. My previous generation X3 got over 40k miles out of each set. The dealer said the've seen replacement around 20k is common on these X3s. Crazy.
__________________
2004 330CiC (8/15 - present)
2011 X3 28i (1/12 - present)
2011 328i (5/11 - present)
2009 MINI Cooper (4/09 - 5/11)
2006 X3 (03/07 - 1/12)
1995 325i (05/06 - 3/09)
1985 325e (08/00 - 12/04)
Reply With Quote
Reply

See More Related BMW Stories

Tags
discount tire, mismatched, tires


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 F25 (2011 - current)
Today's Posts Search
Thread Tools
Display Modes

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 On



Forum Jump


All times are GMT -7. The time now is 08:27 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms