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 Topic: Correct tyre pressures
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29/2/2020 at 10:25am
Location: London
Outfit: Lunar Cosmos 524
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I would urge EXTREME caution in selecting the tyre pressure you use, especially one lower than the manufactures recommended!
When I picked my new to me s/h van up from a dealership, it handled like an absolute pig on the way home, despite having a damped coupling and ATC (which was kicking in and doing its stuff), it snaked at almost every undulation in the road (ATC stopping it getting too bad!) at speeds way below the 60mph limit. I really doubted that I had made a wise purchase!
Before writing off my new van as a bad lot, I thought I would do some basic checks like tyre pressure and nose weight (I had assumed dealer had done these correctly for me! - I was wrong!), tyre pressures were actually around 10psi below manufacturers figure (59psi), nose weight was a little over but not hugely. Pumped tyres up to recommended pressure and went for a test drive, well the difference was unbelievable dramatic, like an entirely different van! Having now covered thousands of miles over coming up 3 years I've never experienced another 'wobble', been rock solid at all sorts of speeds, roads and conditions.
There is no doubt tyre pressures can be absolutely critical to a safe and enjoyable towing experience.
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 via mobile 29/2/2020 at 11:13am
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Outfit: http: www.arcsystems.biz
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The reason I asked earlier was you said load index was 104? 185R14C are 102, max pressure 65psi at 850kg or 1700kg load per pair of tyres
Directly from this tyres pressure chart then, (as originally supplied by Tyresafe), correct pressure for 1469kg is 54psi and 1532kg is 57psi.
(As for the 'calculation' I dismissed that years ago as only suitable for getting close without going under. Reason being, air pressure doesn't carry load, volume of air carries load and the resulting pressure is arrived at by squeezing the required volume into the available space within the tyre.
Where then the error comes in calculating from two maximums is, as pressure increases, increase in load per psi added reduces due to back pressure trying to get back out!, so a graph of the results would be curved, (parabolic curve), and simply calculating from two maximums, must assume it's straight).
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via mobile 01/3/2020 at 12:41pm
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Frankly I'm totally against adding extra pressure, except on horsebox tyres but thats to do with centre of gravity being 5ft of the ground!
Caravans need the easiest ride possible, not least due to all the vibration sensitive electronics they contain. That then also makes wheel balance essential, something else, still, not done out the factory, albeit they do finally fit tyres fit for purpose, but then go stick 10% extra pressure in!!!
And here's a safety warning, apart from the reduced tyre contact area with the road, when an over inflated tyre hits a bump, it and the relatively crude suspension absorb the impact. So reducing the tyres ability cannot help at all, this further reducing the contact with the ground as the suspension recoils and the van goes momentarily lighter than otherwise it might.
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