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      12-23-2013, 01:14 PM   #11
Netwon
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Drives: '12 BMW M5 Alpine White
Join Date: Nov 2012
Location: Northern Alberta

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2012 BMW M5  [0.00]
Quote:
Originally Posted by johnbmw6 View Post
I run mine at 39 PSI all round, it works just fine.
4/5 PSI higher than summer is the way to go.
Just stick with the owners manual pressures for the load and speed you intend to go. However if you are in colder temps (-20 to -35C) I wouldn't go over inflating the tires if you are after grip. That said every 5C you'll find the need to adjust air pressure.
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