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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-16-2013, 07:52 AM
SUG55R SUG55R is offline
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Mein Auto: 2011 BMW 335i conv
Tire pressure: dealer vs sticker values

I just purchased a 2011 335i convertible, and after it sat in my garage overnight, the tire pressures are 37 & 37 front, and 41 & 41 rear. The sticker on the door frame says they should be 33 front and 41 rear. (The tires are all ContiProContact SSR 225/45R17 91H M+S which I assume are the original tires on this car; it has 17K miles.)

Should I decrease the tire pressure in the front tires to 33 or leave them at 37?
Thanks...
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Old 05-16-2013, 07:56 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by SUG55R View Post
I just purchased a 2011 335i convertible, and after it sat in my garage overnight, the tire pressures are 37 & 37 front, and 41 & 41 rear. The sticker on the door frame says they should be 33 front and 41 rear. (The tires are all ContiProContact SSR 225/45R17 91H M+S which I assume are the original tires on this car; it has 17K miles.)

Should I decrease the tire pressure in the front tires to 33 or leave them at 37?
Thanks...

Judgement call. I find recommended pressure's best, or up to 2 lb above. Guessing my press gauge accuracy's at issue.
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Old 05-16-2013, 07:57 AM
irianjim irianjim is offline
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I would go with the factory recommendation and go with what the book and the door says. I always go with the book on my cars as I feel like BMW has a lot of people who know more about these things than I do (or my dealer).
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Old 05-16-2013, 08:23 AM
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tturedraider tturedraider is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Judgement call. I find recommended pressure's best, or up to 2 lb above. Guessing my press gauge accuracy's at issue.
+1 - I go two psi over.
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Old 05-16-2013, 08:35 AM
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floydarogers floydarogers is offline
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I'm with Cal and tture on this.

Note that these RFT tires (and low-profile in general) are very sensitive to under-inflation, and handling deteriorates very fast if they're not "just right". IMHO, the sticker settings may slightly reduce tire (especially rear) tire life, but handling is just crappy if you're down by anything more a a couple pounds.
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Old 05-16-2013, 08:57 AM
Tom K. Tom K. is offline
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As I feel that the sticker recommendation of 32F, 39R for my '07 E91 promotes too much under steer, I set mine at 34/37. Both handling and ride are improved with light loads, but I do inflate the rears to 41 when carrying a full load. Tire wear (OEM A/S RFTs) is fine.

Experiment a bit and see what works best for you.

Tom
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Old 05-16-2013, 02:22 PM
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thekurgan thekurgan is offline
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another tire pressure thread ... start with door jam sticker, work your way from there deciding on the ride/handling/fuel economy, etc.
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