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X5 E53 (1999 - 2006)
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  #1  
Old 02-13-2014, 06:47 AM
ImolaRedM3 ImolaRedM3 is offline
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Location: South Carolina
 
Join Date: Sep 2013
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Mein Auto: 03 BMW M3
Tire issue?

I Bought a 03 X5 4.4l in September. In December the Tranny let go. After a two month ordeal over getting the tranny rebuilt. She is back and driving great. Although it does need tires. So after shopping online I noticed that my particular x5(with sport package and 19's) should be running 255/50R19's on the front and 285/45R19's on the rear because of staggered rims. So I then went outside to check what the vehicle has on it now because I never really paid much attention. I found that someone has put 255/50R19's all the way around. Stretching them over the wider rear wheels.

My questions is this. Could that have been what caused the tranny problem to begin with? Will it hurt me to continue driving the x5 until I get new tires? Or should I park it? Any input is appreciated. Thanks
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  #2  
Old 02-13-2014, 01:21 PM
bagdropper bagdropper is offline
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Location: Iowa
 
Join Date: Aug 2013
Posts: 31
Mein Auto: 2006 X5 3.0i
If it calls for different sizes (mines not a sport, 17" on all 4) and they aren't it very well could have caused (and might still be causing) your AT issues.

Last edited by bagdropper; 02-13-2014 at 01:25 PM.
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Old 02-13-2014, 01:33 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,898
Mein Auto: 1997 740iL / 2006 X5 4.4
A pretty simple wheel/tire size calculator can determine if there's an issue with using the same size tires on staggered wheels...or other scenarios. Also, an incorrect tire size or ratio from side to side...or from axle to axle (front/rear) would have more of an impact on the transfer case and the ABS/Odometer/Speedometer than it would on the transmission.

As long as the overall diameter is within spec/range...then there should be an issue. So, making the assumption that "the wheels" are the staggered BMW Style 132 19" wheels...see the chart below after running that wheels' specs (width/height/offsets) with the same size tires mounted.


Using the calculator...it looks like once mounted...the tire's width is the same at the bottom (where the rubber meets the road )...and the overall height/diameter will still be the same (29.1")...even though the rear tires are stretched over a slightly wider wheel. (see image below)

Hope this helps calms any fears. The wheel/tire calculator site used was: Custom rims, wheel tire packages for your ride - RIMSnTIRES.com


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