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Subject Topic: Tyre pressure - confused!!!!!!
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Personnavver
12/5/2015 at 10:39pm
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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.


PersonOnewheelonmywagon
13/5/2015 at 12:22am
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4 tyres with a load index of 93 are capable of carrying 2600kg, so seem over specced for the caravan.

Tyresafe.org


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Personacampingwewillgo
13/5/2015 at 7:45am
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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


Persontrog100
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


PersonOnewheelonmywagon
13/5/2015 at 10:26am
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The formula for calculating tyre pressure yields:

50 x 1678 / (4 x 650) = 32.3 psi


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Personjadatis
13/5/2015 at 1:14pm
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Calculated that they used for the 29 psi advice with 1678 kg and maxload a tyre of 650 kg, that the assumed AT-pressure would be 50 psi, wich is American system C-load with 50 psi AT pressure .
But this C-load is often compared with 6 pr of your European system tyres with 55 psi At-pressure.

Then for 50 psi At pressure ( C-load) , 29 psi has loadcapacity of 1681 kg calculated with European formula to wich America stepped over as late as 2006 but only for normal car tyre ( P-tire) and XL//.

for 55psi At-pressure ( 6 Plyrated is EUR system) this 1678 would need 31.8 psi so rounded up to 32psi would be the advice.

But this is to system the vehicle- and tyre-makers use.

Made picture of my filled in spreadsheet for your situation wich comes to 39 psi advice even.
then substracted first 4% towbarload to get axle load, and added 11% to that for maximum reserve without bumping.

What is done is going over to general advice of AT-pressure of tyre for trailers, because often overloaded or unequall loaded, only for the savety of tyre so you wont have a blow out with all the missery that goes with it.
But then wrong At-pressure used , courced by the confusion of C-load/6PR .
In the end the 50 psi is even to high, will give bumping . but if the tyres loose pressure in time it can go as low as 35 psi and then still a combined overload and weightdifference R/L of 179 kg possible( fi 80kg weightdiff and 99kg overloaded) and maximum speed of 120km/75m/h, so will still be fast enaugh I think.

Here the first calculation in wich I lowered first the Loadindex by 2( 93-2=91) to give the tyre a deflection that is needed for 160km/h for maximum savety with no bumping.

for the lowest pressure for 120km/75m/h I highened up the LI with 2 to 95 to get that lowest advice of 35 psi.



Post last edited on 13/05/2015 13:40:26

Post last edited on 13/05/2015 13:48:30

-------------
signed in for tyre-pressure


Persontrog100
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


Personjadatis
13/5/2015 at 1:54pm
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Trog100

When reading over my post I saw that I used 65 psi AT-pressure
Corrected the text and picture to 39 and 35 psi my advice.
While doing that you reacted , so reread my post.

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signed in for tyre-pressure


Personacampingwewillgo
13/5/2015 at 3:05pm
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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.


Personjadatis
13/5/2015 at 3:17pm
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33 psi is what I calculated with my spreadsheet for up to 100km/62m/h . but then still with the 179km combined overweight and weightdifference R/L possible before damage to tyres.
So 32 psi would give some less reserve, but probably still save for the tyres (with a little bit of luck, but why go for luck).
That is if not overloaded to much and pressure device is accurate and dont give to high pressure, and other ifs and buts.
I still would advice 35 psi, then still no terrible bumping and save up to 120km/75m/h.

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signed in for tyre-pressure


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Personacampingwewillgo
13/5/2015 at 5:08pm
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Thanks Jadatis. I'll go for 35 psi.


PersonOnewheelonmywagon
13/5/2015 at 11:18pm
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Sounds like a good plan


Persontrog100
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


PersonOpensauce
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.


Personacampingwewillgo
14/5/2015 at 9:14am
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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


PersonOpensauce
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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