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 Topic: Tyre pressure - confused!!!!!!
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12/5/2015 at 10:39pm
Location: West country
Outfit: Mondeo
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If we know the max pressure and max weight rating together with number of axles and caravan weight it is quite easy to calculate the correct pressure.
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13/5/2015 at 12:22am
Location: W Midlands
Outfit: Fleetwood Heritage 560-4 & Discovery 4
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4 tyres with a load index of 93 are capable of carrying 2600kg, so seem over specced for the caravan.
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13/5/2015 at 7:45am
Location: Chiltern Hills
Outfit: Bailey Senator Wyoming
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Hi Navver. The MTPLM is 1678kg MRO 1435kg
Max tyre pressure is 50 PSI Max load of each tyre is 650kg. These tyres are on a twin axle caravan with a twin Powrtouch motor mover. Thanks
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13/5/2015 at 8:56am
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1678 divided by 4 puts 419.5 on each tyre..
the van would need to weigh 2600 kg for the tyre to need the max pressure of 50 psi..
the figure of 50 psi is wrong.. ignore it.. use the other figure..
trog
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13/5/2015 at 10:26am
Location: W Midlands
Outfit: Fleetwood Heritage 560-4 & Discovery 4
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The formula for calculating tyre pressure yields:
50 x 1678 / (4 x 650) = 32.3 psi
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13/5/2015 at 1:44pm
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so we have the "50" a 29 psi a 32 psi and now a 46 psi with a lowest 41 psi.. he he
purely on the basis that caravans have very rudimentary suspension and need the flex in the tyre to help soften the impacts and caravans tend to be not overly strong i would settle for a nice low and easy to remember 30 psi for the OP van..
some folks go for the harder the better.. me i go for the softer the better.. everyone else can take their pick.. :)
trog
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13/5/2015 at 3:05pm
Location: Chiltern Hills
Outfit: Bailey Senator Wyoming
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Crikey guys!! Thanks for all the advice, I think I'm going to sit on the fence with this one and pump them back up to around 32 psi - that's only 3 psi more than Bailey recommend.
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13/5/2015 at 5:08pm
Location: Chiltern Hills
Outfit: Bailey Senator Wyoming
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Thanks Jadatis. I'll go for 35 psi.
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14/5/2015 at 8:21am
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not entirely logical.. the makers say 29 psi.. someone comes up with a higher figure and then adds a couple of psi just the make "sure"..
why not just follow the makers recommendation.. if they follow the same pattern as everyone else seems to they have probably already added a couple of pai just to make sure.. he he
mind you over inflating tyres does seem the order of the day.. :)
trog
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14/5/2015 at 8:30am
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Yes, at the end of 2 pages why not go with the figure in the handbook? That will be the correct one. A good point made is that excess tyre pressure will give a harder ride putting undue stress on caravan body.
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14/5/2015 at 9:14am
Location: Chiltern Hills
Outfit: Bailey Senator Wyoming
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Sounds like everyone has their own ideas on tyre pressures!! I towed our caravan over 300 miles home when we brought it on 50 PSI, did I notice it bouncing - not really, but then again I'm used to towing my horses in my horse trailer who shuffle around (and the PSI on those tyres are 65 PSI!). I tow with a Nissan Pathfinder so towing is a doddle! Thanks for all the advice guys
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14/5/2015 at 10:23am
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If you run at excessive tyre pressure you reduce the already crude suspension effect causing more stress on body, speeding up failure of body seals leading to water ingress. You get posts on here complaining of caravans leaking after just a few yrs & excessive tyre pressures can be one of the causes.
The advantage of twin axle caravan is that one can run at lower tyre pressures which is kinder to the body. If the manufacturer figure is 29psi, then thats the pressure to run at.
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