Member Since: 08 Nov 2005
Location: Oldbury, WM
tyre pressures - cold to hot
We all know that tyre pressures increase when the tyre is hot, but I didnt realise just how much. For those that tow with the D3 and D4 its has been the case to raise the rear tyre pressures, I know I have, usually to 41psi, but after finding that running on 275/45/21's a better ride was gained by running at 39psi (these being cold PSi numbers). I just happened to check the pressures (via the dash) after a couple of hours towing, so hot tyres, and they were are 45psi - so 6PSi up. Didnt realise it was that much of an increase.
AlMY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
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That is interesting. I put mine at 41 psi when towing my digger. Total trailer weight bang on 3.5t.
19 mpg or less with that on the back.
2006 Disco 3
Gas Gas 300ec
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Pajero 2.8 Lifted and Safari Snorkel
15th Aug 2017 10:01 am
Member Since: 07 Apr 2014
Rule of thumb is 1psi rise per 5 deg C rise in temp. So your tyres were 30deg C warmer after your trip. It would have been interesting to know what the pressure would have been if you'd run them at the higher initial pressure.
A good reminder of why checking and adjusting tyre pressures as the weather changes through the year is also important.Visiting from rrsport.co.uk
2012 RRS SDV6
2008 RRS TDV8
15th Aug 2017 3:23 pm
Member Since: 08 Mar 2016
Location: South Bucks
During the cold snap, my TPMS said one of my tyres was a bit low. Now it has warmed up, it is no longer too low.
Is there an ideal temp for setting the tyre pressure, or should they hit the required pressure at whatever the current running temp is?MY16 D4 Graphite in Loire Blue
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