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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes Incorrect Tyre Pressures
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      05-01-2013, 10:58 AM   #1
F10N47
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Incorrect Tyre Pressures

This may help any new 5 Series owners who are a little disillusioned with the steering/ride comfort on their cars.

I took delivery of my new F10 last week and have now covered just over 500 miles. The ride comfort was quite good from the start (M Sport suspension & 19" Michelin runflats) but the steering pulled to the left slightly on moderately cambered roads, as well as feeling a little nervous in a straight line. I was contemplating a four wheel alignment as I was sure there was a geometry error but, before booking an appointment, I checked the tyre pressures. The supplying dealer had set the tyres to 34 psi front & 35psi rear. I deflated them to 31psi front & 32.5psi rear, as shown on the door sticker and the improvement is incredible! The ride was ok before, but now it's far more comfortable over sharp ridges and imperfections. There's no sign of the steering pull I'd felt before and straight line stability is also as it should be.

I'd urge owners to buy a decent gauge and check tyre pressures on a very regular basis. Even a small difference in pressures makes a huge difference in comfort and feel.
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      05-01-2013, 12:20 PM   #2
Zaman
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Good suggestions. Thanks,
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      05-01-2013, 10:32 PM   #3
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will it be the same for 20"
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      05-02-2013, 11:31 AM   #4
snj1013
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No. Check your manual for recommended pressures. Use these as a starting point but remember that tire load ratings come into play. Compare your load rating to stock and add pressure if load rating is less on your new tires.
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      05-10-2013, 11:24 AM   #5
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Caution going much lower than spec...you might need that air pressure in a low profile tire to keep the sidewalls stiff....lest you bend a rim going too fast over a pothole or railroad track with underinflated tires.
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      05-11-2013, 09:50 AM   #6
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Quote:
Originally Posted by F10N47 View Post
I deflated them to 31psi front & 32.5psi rear, as shown on the door sticker ...
Interesting the recommended pressure is that low in the U.K. Here in the USA the 19" Michelin runflats (245/40 & 275/35) have an inflation recommendation of 36/38 psi. I usually keep mine in the 38/40 range.
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      07-07-2013, 08:48 PM   #7
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I just did a test on my 20" 245/35 & 275/30
1st run with 38 front and 40 rear and the ride was hard and road feel was about 50% less, felt like the car was floating.
2nd run with 36 front and 38 rear and the ride was great and road feel was perfect.
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