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Subject Topic: Caravan tyre pressure ? Post Reply Post New Topic
Personbeefysmum
08/8/2010 at 7:24pm
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Where can I find out the correct tyre pressure needed for the caravan tyres?

Edit, I found an old thread with instructions on how to calculate.


this is the formula I found for working it out

Lets say for example , it states 1460kg at 65psi on your tyre , and your caravan weighs 1075kg .

What you do is 65 divided by 1460 = 0.0445

Then , times 0.0445 by 1075 = 48psi



My tyres say 1477 at 54psi

van weight is 1100 .

so the pressure is 40 psi , right ?

Post last edited on 08/08/2010 19:57:11

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Debbie


Personfife-bloke
08/8/2010 at 9:33pm
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i would always say go by whats written in the handbook.if it isnt available,contact a local dealer.Personally,im never convinced with these formulas

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Personarc systems
08/8/2010 at 10:22pm
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The formula is useful but not accurate, the answer is always on the high side so safe, but, the further you get away from the maximum pressure the more inaccurate it gets.

I don't have a listing for 1477kg at 54psi? have a look here or here and see if yours is listed


Personbeefysmum
08/8/2010 at 10:47pm
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here's what it says on the tyre

175R 13 C steel belted radial 94/92N 6pr

max single load 1477 at 54psi

max dual load 1389 at 54psi

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Debbie


Personarc systems
08/8/2010 at 11:23pm
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Well Debbie, 1477 is the maximum load in pounds which is 670kg, 94 is the Load Index for 670kg which is the load index number for single use, (no concern to caravan use but the lower LI of 92 is when tyres are used two together side by side on Transit vans etc).

The first link then has your tyres listed and the correct pressure is 43psi.


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Personbeefysmum
08/8/2010 at 11:27pm
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Thank you gary , much appreciated .

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Debbie


PersonWhatamess
09/8/2010 at 8:18am
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Not necessarily. The recommended pressure for the tyres I've got, which is what the fitter put in, is 40 but the handbook says 33 and I'm assured by Swift that the handbook is correct regardless.

Nora


Personashwellgirl
09/8/2010 at 9:51am
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Our tyre pressure is on the caravan plate which on ours is beside the door!

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Personold chap
09/8/2010 at 10:54am
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Quote: Originally posted by ashwellgirl on 09/8/2010
Our tyre pressure is on the caravan plate which on ours is beside the door!
this is purly reliant on whether the  tyres on the van are the same as was originaly fitted by the manufactorer. mine are not as the original tyre size is no longer obtainable


Personfallenangel
09/8/2010 at 11:14am
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  I am jumpiong n Debbies post here sorry Debbie but as everyones getting to know I worrie about everything.so we have tired that were fitted on our van 13 months ago and were puped upand done for us. as we have a van from the auntics road show. No hand book an unreadabel plate and differnt tyers do we follow the tire pressuers for the trie then

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Personbeefysmum
09/8/2010 at 12:26pm
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Wendy,no ned to apologise. My caravan is old too, and I should think the tyres must have been replaced at some time , it is 15 years old so may not be the same type as factory fitted .

I've no idea if we have a handbook with this information , as the van is in storage . Avondale are no longer trading so cant get info from them.


The best thing i can do is trust what Gary says, its the right pressure on his table.

you see I had not worked out correctly myself because I was using pounds instead of kilos.

Its not easy is it ?

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Debbie


Personold chap
09/8/2010 at 2:30pm
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Wendy

you will need to find out what the maximum allowed weight is for your van known as the MTPLM or MAW then your tyre size & details Then find the tyre size in this list http://www.tyresafe.org/data/files/caravan%2008.pdf follow along to the max axle weight of your van & this will give you the correct tyre pressure


Personarc systems
09/8/2010 at 3:54pm
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As said the hanbook may or may not be correct, it maybe the tyres are different or indeed some manufatures simply quoted the tyre maximum pressure? rather than the correct pressure for the vans weight! quite common that until recently!!

The Tyresafe chart shows correct pressure for most common sizes used today, the chart I have and linked too above is the old tyresafe chart from their original booklet,  this shows a few more less common sizes today but still widely used on older vans.


PersonMERCURY3
09/8/2010 at 7:40pm
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Talking of tyres,we have just returned from our hols in Poole, we have a Rapido folding caravan , did all the checks before going ,tyre pressure ok , tread ok general condition of both tyres ok ,about 5 miles from our site one of the tyres shredded no problem only going slow, lucky we were right by a restaurant car park, so changed tyre for spare, we were concerned why a good quality tyre should shred as all looked ok . We went for new tyre to Nationwide Tyres Poole (very helpful and recommended) the fitter looked at the tyre which was a premium make and informed us that they all had date stamps on them and that our tyre was about 20 yrs, old( we purchased the Rapido second hand about 3 yrs.ago) and that the tyre had probably perished from the inside, he said that all caravan tyres should be changed at least every 5 years, never knew this , a lesson well learned. Dave/ Jane.



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