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      09-16-2015, 06:45 PM   #1
Crazy1323
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X5M 21" Correct Tire Pressure

Can someone please let me know the correct tire pressure for an X5M with 21's and Michelin Pilot Super Sports. The sticker on my door jamb is for 20"

UPDATE:

I found the correct tire pressures for 21" Tires. The first number is for light loads, the second number is for heavy loads. This information comes out of page 250 of the manual.

285/35/21 105Y XL 35Psi/41Psi
325/30/21 108Y XL 42Psi/46Psi

Last edited by Crazy1323; 09-17-2015 at 09:23 AM..
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      09-17-2015, 01:39 AM   #2
mitch808
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PSI is static. if you had a 15" wheel or a 26", you would still use the sticker in your door as the recommended value.

Ideally... Use the door value. Rub a 1" line of chalk across the entire thread from inside to outside. Drive in a straightline, do not turn for about 10 car lengths. Look at chalk line. Where is it worn more? Inside? deflate 1-2psi. Outside? Inflate 1-2psi. Test again.
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      09-17-2015, 06:14 AM   #3
Crazy1323
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Quote:
Originally Posted by mitch808 View Post
PSI is static. if you had a 15" wheel or a 26", you would still use the sticker in your door as the recommended value.

Ideally... Use the door value. Rub a 1" line of chalk across the entire thread from inside to outside. Drive in a straightline, do not turn for about 10 car lengths. Look at chalk line. Where is it worn more? Inside? deflate 1-2psi. Outside? Inflate 1-2psi. Test again.
That first part is not true at all. Different tire sizes can have different load ratings and require different PSI's.
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      09-17-2015, 05:07 PM   #4
mitch808
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Quote:
Originally Posted by Crazy1323 View Post
That first part is not true at all. Different tire sizes can have different load ratings and require different PSI's.
You didn't ask about loads. You asked about moving to a 21" wheel. pressure would be the same as a 20" tire.

Heck you could even follow the tire specs, at the expense of running abnormally high. What you see on the car is based on car/load weight.
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      09-18-2015, 02:17 AM   #5
theaudir8fan
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not sure where your numbers are coming from, but in the M owner's menu, it says 38/38 for up to 100mph, 45/46 for over 100mph

38/38 seems to be the baseline that 20s and 21s are set to
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