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Old 07-30-2013, 11:44 AM
leehenken leehenken is offline
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Two tire replacement

I was told I have to buy four new tires on my 2006 X5 or I will have transmission problems
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Old 07-30-2013, 02:49 PM
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QSilver7 QSilver7 is online now
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Mein Auto: 1997 740iL / 2006 X5 4.4
Can you provide us with more of the story? We can surely give you the answer you want to hear (no)...but it may not be the correct answer...depending on why you were told this.

There's a HUGE leap in logic from being told to buy 4 new having tranny issues if you don't. It doesn't make sense without more of the story. Help us help you better.
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
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Old 07-31-2013, 03:32 AM
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Scott ZHP Scott ZHP is offline
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This is a common tire store scare tactic on vehicles with AWD. They'll try and convince you that the center diff will be working overtime to try and correct for the different rolling circumference of the worn vs new pairs of tires.

Ideally, you dont want more that about 6/32 difference between the 4 tires. It really depends on the center diff and how variable it is to torque split biasing. The early E53 (without X-drive) used a fixed F/R torque split with an open diff; this is probably more tolerant of wheel diameter differences than the later X-drive, which has clutch packs to wear.

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Old 08-06-2013, 03:45 AM
Hans Benade Hans Benade is offline
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Originally Posted by leehenken View Post
I was told I have to buy four new tires on my 2006 X5 or I will have transmission problems
I have a 2006 E53 3.0d Sportpack and my car's transfer case actuator gave in.
I was told it was because the circumferences of the wheels differed to much, causing the actuator to work to hard.
I have wider tires in the rear and they wear quicker on the inside.
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