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      02-12-2013, 02:15 AM   #1
Bruno28
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M-Sport Tyre pressure

Whats the correct tire pressure on the m-sport wheels with stock RFT?

I checked mine and it was Rear at 45psi and Fronts at 35psi. On door it recommends F27/R32

I think thats too much, so I lowered to Rear 34psi and Front 32psi.

What pressures do you guys use and what do you recommend?
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      02-12-2013, 04:05 AM   #2
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36psi rear and Front 34psi
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      02-12-2013, 04:12 AM   #3
Bruno28
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Quote:
Originally Posted by Active View Post
36psi rear and Front 34psi
So the advertised pressure on door are really low!
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      02-12-2013, 04:17 AM   #4
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Yep, not sure why they do that. Will need to ask the BMW service dept or even the tyre company.
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      02-12-2013, 06:06 AM   #5
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Most new design 'run flat' tyres have strong sidewalls to support the tyre if it becomes under inflated or punctured.
Depending on the brand, most tyre fitters will recomend between 36 and 40 PSI all round.
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      02-12-2013, 07:23 AM   #6
BenN
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The tyre pressures on your door card may well be different to that of a different engine size or type (ie petrol vs diesel) it all depends on the weight over each axle to determine the correct pressure so that the tyre 'sits' correctly on the road. I was always told to go off the door card for the correct size. My 120d door card also has different pressures for winter and summer tyres.

Hope this helps.
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      02-12-2013, 11:10 AM   #7
will-w
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My 118d suggests 200kpa (29psi) front and 220kpa (32psi) rear.

As above, it will vary from engine to engine and also climate - I'd expect the pressures to be different in Europe compared to Oz where the climate is a lot hotter
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      02-12-2013, 11:54 AM   #8
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So would you run higher or lower pressures in cold weather? And why?
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      02-13-2013, 12:46 AM   #9
Bruno28
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I put today F36 and R40
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      02-14-2013, 02:16 AM   #10
ovekvam
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If you are in doubt about the tire pressure, it is better to use too high pressures than too low. I am guessing that run flat tires are less sensitive to tire pressures than regular tires.

With my regular tires, I use 35psi in all corners. It can be usefult to lower the pressures to around 30 psi for very slippery conditions, and up to around 40 for a fully laden car.
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      02-14-2013, 02:33 AM   #11
will-w
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Quote:
Originally Posted by ovekvam View Post
So would you run higher or lower pressures in cold weather? And why?
I would think you would run higher pressures in colder climates and lower in hotter climates.

My (somewhat fuzzy) reasoning behind it is that in a hotter climate the tyre will get a number of times hotter in use than that of a colder climate. Hotter conditions plus hotter tyre should equal a larger change in volume/pressure of the air in the tyre.

In the UK you can get up to 2psi change of pressure after some progressive driving, I'd expect in a climate 15-20*C hotter that would be more like 4psi?

Of course I'm no scientist and the above is purely my own fiction (except the UK pressure change), so I could be completely wrong and talking crap
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      02-14-2013, 03:01 AM   #12
ovekvam
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Quote:
Originally Posted by will-w View Post
I would think you would run higher pressures in colder climates and lower in hotter climates.

My (somewhat fuzzy) reasoning behind it is that in a hotter climate the tyre will get a number of times hotter in use than that of a colder climate. Hotter conditions plus hotter tyre should equal a larger change in volume/pressure of the air in the tyre.

In the UK you can get up to 2psi change of pressure after some progressive driving, I'd expect in a climate 15-20*C hotter that would be more like 4psi?

Of course I'm no scientist and the above is purely my own fiction (except the UK pressure change), so I could be completely wrong and talking crap
It makes sense to me. I have seen pressure changes around 10+ psi for track driving on warm days. The change is a lot smaller when the tarmac is wet. I think the increase in pressure has mot to do with the driving style than the ambient temperature, though.

It is a good idea to check the tire pressures if there is a big change in ambient temperature, since it affects the tire pressure significantly.
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