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      02-11-2019, 03:18 AM   #1
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Tire pressure recommendation

A couple weeks ago I had a local shop put on a staggard setup of 235/40ZR-19 MICHELIN PS4S and 265/35ZR-19 PS4S on my 2015 335i.

After the install I talked to the technician and he said he set the tire pressure to 41 psi.

That seems a bit high. Does anyone know if that is an issue? Any insight into whether I should keep that pressure or drop it back down to 38 psi?
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      02-11-2019, 09:03 AM   #2
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Recently left the dealer and they asked permission to set the tire pressure to 32psi cold. They mentioned this is the proper psi for this body "from the factory."

I agreed, no problem.

When they get warm, psi increases to 34 or 35 max.
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      02-11-2019, 10:13 AM   #3
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For OEM 19" run flat tires, BMW suggests 33 PSI in the front and 38 PSI in the rear. The tire pressure on non run flats should be higher to account for softer sidewall but is 41 PSI on all tires correct?
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      02-11-2019, 10:59 AM   #4
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Originally Posted by sspade View Post
Recently left the dealer and they asked permission to set the tire pressure to 32psi cold. They mentioned this is the proper psi for this body "from the factory."

I agreed, no problem.

When they get warm, psi increases to 34 or 35 max.
To further clarify...

This was with Continental DWS 06 (the best, non run-flat all season they offer).

Dealer recommends 32psi cold, all around.

Had I been wearing top of the line Michelin... the result would be the same.
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      02-11-2019, 11:05 AM   #5
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I run PS4S's as well, 245/30-20, and set them to 34 cold all around. As long as they're not super high (41 cold is closing in on that) or super low ( <30 cold) it'll be fine, it's kind of a preference thing. That said, I'd drop it down to at least 38 psi. IIRC my tires even say on them do not inflate over 40psi, though that may vary for different sizes.
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      02-11-2019, 11:40 AM   #6
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the driver door sill placard lists cold tire pressures. since non-runflats have a softer sidewall than runflats, i'd initially add 3 psi to whats listed and then adjust if needed, after driving around and seeing what the comfort, steering response, etc., is like.
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      02-11-2019, 11:53 AM   #7
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Quote:
Originally Posted by alohasurftoad View Post
the driver door sill placard lists cold tire pressures. since non-runflats have a softer sidewall than runflats, i'd initially add 3 psi to whats listed and then adjust if needed, after driving around and seeing what the comfort, steering response, etc., is like.
I think this makes a ton of sense considering these vehicles are shipped with RFT.

I believe a couple psi increase to compensate for softer walled tires makes sense.

Putting us somewhere in the 34 psi cold, 36 warm range.

At the end of the day, as mentioned above - it comes down to personal preference and feel once you are within the 32-38 range. Anything lower or higher may need adjustment.
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      02-12-2019, 02:27 AM   #8
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BMW dealer set my tire pressure to 32psi front 36psi rear after taking it in a few days ago.
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      02-12-2019, 07:28 AM   #9
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Thanks for all the comments. I think I will add the 3psi.
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