Home > Wheels & Tyres > Checked your tyre pressures recently? |
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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6601 |
You need to convert the temperatures to Kelvin rather than use deg C. To do that, add 273 to the deg C value.
So P2 = P1 * T2/T1 = 40 * (273+30)/(273+22) = 40 * 303/295 = 41 psi (2 sf) 1988 90 Td5 NAS soft top 2015 D90 XS SW |
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19th Jul 2013 11:41am |
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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6601 |
Also, the tyre (and its air) may be warmer than the surrounding air, which is measured in the shade.
A tyre in the sun will be hotter than that 1988 90 Td5 NAS soft top 2015 D90 XS SW |
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19th Jul 2013 11:43am |
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theorangebandit Member Since: 03 Jun 2013 Location: Stowmarket Posts: 862 |
heat makes a huge difference to all working components on vehicles. I check my tyres weekly but I rack up plenty of miles.
easiest way to watch the pressures is check them on weather changes, drastic ones I mean, like snow then heat, then rain, then warm, and soo on this will give you, in England about 3 weeks between checks lol |
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19th Jul 2013 1:19pm |
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shaun.mobile Member Since: 12 Dec 2011 Location: England Posts: 156 |
Thanks for the reminder Martin, I had forgotten all about absolute zero.
Doesn't help explain the 50p.s.i. Though |
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19th Jul 2013 10:48pm |
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william8 Member Since: 03 Apr 2013 Location: Motherwell Posts: 259 |
And you dont get time to drive it if your in Scotland, too busy checking the tyres William |
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20th Jul 2013 3:35pm |
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