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      01-25-2013, 10:16 PM   #9
Sylon
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Drives: 2011 135i, SG/CR, 6MT, M-Sport
Join Date: Apr 2010
Location: Michigan / Ohio

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2011 135i  [4.60]
Quote:
Originally Posted by ShocknAwe View Post
Cold air is denser, molecules slow down blah blah. Essentially warm air higher pressure, cold air lower pressure. Add more air if it's going to be cold for a while, try to keep it around specs. Your tire pressure rises a little when driving after the rubber heats up too.

If you added warm air, the molecules were spaced out more, when it got cold, they crammed in closer. The colder it gets the lower the pressure goes and the TPMS I believe sense a 10% reduction, which isn't much.

Hit it right on the head. Completely normal.


Although my tires are filled with nitrogen, so I'm not expecting to see these low pressure warnings. But we'll see.
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2011 BMW 135i | Space Gray | ///M-Sport | BMW CCA #450291
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