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      05-10-2010, 08:41 AM   #1
BIGTIME
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Tyre pressures with no passengers

I've got the standard 225 msport alloys with factory runflats. I was setting the pressures and noticed on the door card that they differ quite a lot depending on how many passengers I carry. The majority of the time I am on my own, surely I don't have to pump them up with the family in the car then let them down when I go to work on my own? I currently have them set when stone cold as 38psi at the front and 45 at the rear, does this seem ok? I am trying to minimilise outer tyre wear and chances of the alloys cracking.
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      05-10-2010, 08:59 AM   #2
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If you can live with 45 psi in the rears, all well and good, but inner edge wears is a problem on the rears.
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      05-10-2010, 09:01 AM   #3
BIGTIME
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What do you think 45psi is too high for the rears?
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      05-10-2010, 09:03 AM   #4
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Quote:
Originally Posted by BIGTIME View Post
What do you think 45psi is too high for the rears?
It's what's on the door card 3.0 bar, but I found 42 psi about as high as I could live with when I had RF's on mine.
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      05-10-2010, 10:22 AM   #5
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Quote:
Originally Posted by BIGTIME View Post
I've got the standard 225 msport alloys with factory runflats. I was setting the pressures and noticed on the door card that they differ quite a lot depending on how many passengers I carry. The majority of the time I am on my own, surely I don't have to pump them up with the family in the car then let them down when I go to work on my own? I currently have them set when stone cold as 38psi at the front and 45 at the rear, does this seem ok? I am trying to minimilise outer tyre wear and chances of the alloys cracking.
Is your door shut placard showing two sets of recommended pressure settings, 4 adults max and 4+1 adults and luggage?

Sort of explains it, then we tune pressures for road feel and wear patterns. The main thing is not to run low pressures when loaded and/or driving long distances at high speed. For normal use low pressures usually end up contributing to odd wear and loss of the tyre shoulders.

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      05-10-2010, 11:04 AM   #6
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Pete - The placard has pressure for 4 adults and luggage and i.e max and a min pressure if travelling on your own.
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      05-10-2010, 12:58 PM   #7
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yeah 45 at the rears seems a lil bit high....are u on 18inch? I'm on 40 psi fronts and 42 psi rears...and i got 18s....standard bridgestone runflats...ride is very crashy...but i like it hard! ;-)
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      05-10-2010, 03:07 PM   #8
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...but i like it hard! ;-)
So Sunny said.
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      05-10-2010, 03:45 PM   #9
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When I had 225 & RFTs on my E91, I found the ride actually better when it was on the door settings (3.0 bar rear). It seemed to get harder with the tyres underinflated. Coupes maybe different of course.
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      05-10-2010, 04:22 PM   #10
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i run mine on 0.2 bar over whatever it says on the placard..

need to check mine on the weekend tbh
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      05-10-2010, 05:22 PM   #11
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Quote:
Originally Posted by BGM View Post
i run mine on 0.2 bar over whatever it says on the placard..

need to check mine on the weekend tbh
I think that's what mine are set to.

E92 with 19" 225s, fronts are 2.7 and rears are 3.2

I think that's pretty much smack in the middle of the minimum/maximum loading stated on the door sticker.
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      05-10-2010, 06:40 PM   #12
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Yeah I've done the same, E90 with 18" 193...fronts are 2.6 and rears 3.1(i think)... has actually improved the ride and handling significantly...
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      05-10-2010, 06:52 PM   #13
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Quote:
Originally Posted by neilv View Post
Yeah I've done the same, E90 with 18" 193...fronts are 2.6 and rears 3.1(i think)... has actually improved the ride and handling significantly...
I do this too - 2.7 front 3.1 rear, so a little higher than the placard says for light loading.
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