02-12-2013, 02:15 AM | #1 |
First Lieutenant
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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? |
02-12-2013, 06:06 AM | #5 |
Major
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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 |
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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 |
'Captain Slow'
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Drives: F20 118d M Sport
Join Date: Jun 2012
Location: Kent, UK
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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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02-14-2013, 02:16 AM | #10 |
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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 | |
'Captain Slow'
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Drives: F20 118d M Sport
Join Date: Jun 2012
Location: Kent, UK
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Quote:
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 | |
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Quote:
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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