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      11-09-2017, 03:48 PM   #1
aintitthelife98
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Winter Tire Pressure

The weather is getting cold here in New Jersey so I took off my 19" M Sport Staggered Wheel Set and put on my 18" winter set from Tire Rack. This is my first winter with the car and setup so I was hoping to get recommendations on tire pressure.

For the summer set (Michelin Primacy 3's) I generally ran 35 psi all the way around. The winter tires are Pirelli Sottozero 3's, size 245/50R-18. The max pressure indicated on the sidewall is 51 psi. Right now I have them at 38 psi. What would you guys recommend I run these at?

Thanks for the help!
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      11-09-2017, 05:58 PM   #2
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I'd do 34. . .max . it will be a harsh ride much higher especially if sno-tires.
But question . . what is your TPMS set to alarm at ? time to reset ?

remember you'll loose pressure as the temp goes down.
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      11-09-2017, 07:18 PM   #3
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I was running mine at 36 on my previous car, but on the x3 I would not go over 35 even 32 for the fronts by the sticker on the door frame.
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      11-09-2017, 10:04 PM   #4
02420X3
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I typically go +2 over the door sticker all year round. As noted above, the pressure will change according to temperature, about 1 PSI for every 10F degrees. If you're regularly checking and adjusting your tire pressures then you'll compensate for that.

The temperature here is forecast to be in the upper teens/low 20s overnight on Friday. I predict that a number of TPMS systems will alarm on Saturday morning.
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      11-10-2017, 02:57 PM   #5
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If you want your tires to last use 32psi.
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      11-13-2017, 09:06 PM   #6
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and to avoid a lot of up and down air pressure, you can always go nitrogen.
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      11-14-2017, 09:46 AM   #7
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I have just set my winter Run Flat 18" tyres to 2 bar (29 PSI) all round as stated on the door plate. I have been doing this for the past 3 years on this X3 and they are Pirelli Sottozero size 245/50R-18. Have been doing this for the last 15 years on BMWs recommended door plate figures with no undue driving characteristics or adverse tyre wear.
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