Maximum tyre pressure will by stamped on side of tyre - normally would suggest 35-49 PSIG on light truck tyres - do NOT cut crank handle buy a socket extender - if battery on drill gets flat you won't be able to use stabilisers.
__________________
Possum; AKA:- Ali El-Aziz Mohamed Gundawiathan
Sent from my imperial66 typewriter using carrier pigeon, message sticks and smoke signals.
to give some guidance it would help if you could provide the weight of the van loaded (at least the ATM from the compliance plate), and the maximum load at what pressure as stamped on the side of the tyres.
From that it is possible to work out a decent starting pressure by using the formula, ATM divided by the sum total of the tyre maximum weight (if 800 kg is maximum stamped on tyres then this would be 1600). That gives a ratio. Then multiply the Maximum pressure as shown on the tyre by that ratio and that gives a starting pressure to use.
As An example. ATM on plate 1500 kg, Maximum tyre weight 900 kg each, maximum pressure allowable 50 psi at the 900 kg.
Formula would be 1500/1800 (twice tyre maximum) which equals 0.83. Multiple 50 PSI (Maximum tyre pressure) by 0.83 gives a starting pressure to use of 41.66 PSI.
Put your figures into that formula and see what it comes to.
To get a more accurate figure, use an actual weighed weight of the van rather than the ATM off of the compliance plate.
-- Edited by TheHeaths on Sunday 23rd of July 2017 08:50:23 AM
__________________
Regards Ian
Chaos, mayhem, confusion. Good my job here is done
Ian has given a good guide to a pressure to start with. Pump your tyres to that pressure. Then on your first trip measure the pressure at your morning tea stop. It should be around 3 - 5 psi higher than the cold pressure. If it is higher then you need some more wind in the tyres. If the rise is lower then there is to much wind in the tyres. Adjust the pressure when the tyres are cold again and then do the temp/pressure test again on the next leg of your trip.
__________________
PeterD Nissan Navara D23 diesel auto, Spaceland pop-top Retired radio and electronics technician. NSW Central Coast.
I'd recommend running your caravan over a weighbridge to check exactly what payload you have. Just because it's written on the compliance plate doesn't made it gospel.
Brother-in law & sister could only put their socks & undies in their Geist before being overweight.
I'd be keeping you tyre pressures as low a possible to soften the ride. As I said on another of your threads our relatives caravan never went off the bitumen but cost thousands to fix lots of cracks in the sub-frame before the A-frame snapped & it ended up in a roadside drain. Parts are like hens teeth.
Hopefully that doesn't happen to you. Happy, safe travels.
-- Edited by Desert Dweller on Sunday 23rd of July 2017 02:13:10 PM
__________________
Cheers Keith & Judy
Don't take life too seriously, it never ends well.
Trip Reports posted on feathersandphotos.com.au Go to Forums then Trip Reports.
We used to run our Geist tyre pressures at 45psi cold.
I got a spare handle style leg socket and cut it as you have indicated, but as stated if your drill goes flat you are in trouble.
A better option that I eventually went with was a long 1/2" extension bar and deep wall socket on an 18volt Ryobi impact gun, this also gave me the option of undoing the wheel nuts should I have a puncture.
Also check the age of your spare tyre, a lot of them would now be ten years old.
