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Subject Topic: Tyre pressures Post Reply Post New Topic
Message posted by fruit_boy on 21/6/2005 at 9:19pm
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Dolly needs new tyres.........
Both are showing quite a bit of cracking on the outside wall and I suspect the same may be true of the inner wall.

However, the Technical Spec for the 'van states that the tyre pressure should be 54psi whereas the max inflation pressure on the current tyres is well below that (42psi from memory).

Do we need to get special tyres that will take 54psi????
Or will any 6 ply reinforced tyre be OK - if so, what pressure should we run them at?



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Message posted by imatyke on 21/6/2005 at 9:30pm
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Gallery Images:   0 		having had to quickly acquire another spare tyre for my own van after someone had put on a car tyre  instead of the C (commercial) spec which it needed i found out that the max psi on the sidewall was still not the same , so i look forward to the replies coming in on this question myself .

Message posted by fruit_boy on 21/6/2005 at 9:34pm
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Quote: Originally posted by imatyke on 21/06/2005
having had to quickly acquire another spare tyre for my own van after someone had put on a car tyre  instead of the C (commercial) spec which it needed......

Spare???

We don't have one of those - Dolly wasn't supplied as new with one apparently



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Message posted by michael on 21/6/2005 at 9:47pm
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Gallery Images:   3 		hi ,you dont say what your tyre size is.you need 8ply tyres to stand that pressure ,car tyres are not designed for that pressure.it also depends on size of van and weight of van.ie or old bailey had 175x13 tyres 8ply,pressure was 54psi.the weight of the caravan was max1100 kgs. if tyre says max pressure on the side of 42psi it should not be inflated higher.[o)] see www.autow.co.uk  trailer and caravan tyre sizes and pressures.[:o)]Load & Pressure Ratings



Post last edited on 21/06/2005 21:54:12

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Message posted by fruit_boy on 21/6/2005 at 9:53pm
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Quote: Originally posted by michael on 21/06/2005

hi ,you dont say what your tyre size is.

175R13

Dolly is an ABI Award Globestar Prestige with a shipping weight of 1250kg

you need 8ply tyres to stand that pressure ,car tyres are not designed for that pressure.it also depends on size of van and weight of van.ie or old bailey had 175x13 tyres 8ply,pressure was 54psi.the weight of the caravan was max1100 kgs. if tyre says max pressure on the side of 42psi it should not be inflated higher.[o)]

Well that is what I was thinking.........
But could not understand why the difference between the tyres on Dolly (which are caravan tyres, not car tyres) and what the Tech Spec says!

Does it actually matter if we fit 6 ply tyres and inflate to a lower pressure???



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Message posted by michael on 21/6/2005 at 10:00pm
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Does it actually matter if we fit 6 ply tyres and inflate to a lower pressure???


no it does not work that way,the pressure is there to take the weight of the van.any under pressure could make the tyres overheat and blowout.you should be ok with 6ply ask the tyre fitter what pressure they can take.
175 x 13 (6ply) 1407 54/3.75 1340 54/3.75
copied from load and pressures


Post last edited on 21/06/2005 22:04:37

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Message posted by wizard9956 on 21/6/2005 at 10:21pm
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My Avon SuperVan tyres are 175x13C  6ply  54psi max  and are rated to 1475kg .

My caravan weighs approx 1160kg when fully loaded and i inflate the tyres to 42psi .

atb

Wizard

 



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Message posted by michael on 21/6/2005 at 10:48pm
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Gallery Images:   3 		hi wizard i thought yours were 52psi.sorry if wrong.

Add all the tyres maximum weights together and divide a single tyres maximum pressure by this total weight figure.
Next multiply the answer by your vans weight and this will give you a very accurate single tyres pressure.
My van supposedly weighs 1170 all up, its on two 8 ply tyres which carry a maximum 1460kg between them at 65psi

65 divided by 1460 = 0.0445,

times 0.0445 by 1170 = 52psi



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Message posted by wizard9956 on 21/6/2005 at 10:54pm
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Hi Michael , nope mine are 42psi , the quote was what Gary ( Arc systems ) posted some time ago , on how to work out tyre pressures . The 52psi relates to Garys caravan . 

I've just had a look at the post and can see that it could be miss-read , hope this clears it up .

atb

Wizard



Post last edited on 21/06/2005 22:59:56

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Message posted by michael on 21/6/2005 at 10:58pm
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Gallery Images:   3 		soz[:oops:] long way round but what i was trying to says was,if the book says 54 psi for his van this is what he should use.[:o)]

Post last edited on 21/06/2005 23:01:00

Post last edited on 21/06/2005 23:03:28

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Message posted by arc systems on 22/6/2005 at 12:54am
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Quote: Originally posted by michael on 21/06/2005
soz[:oops:] long way round but what i was trying to says was,if the book says 54 psi for his van this is what he should use.[:o)]

Not quite actually, I had a look last weekend at 'reinforced' tyres..not 6 or 8 ply it just said reinforced These tyres had a max load just a tiny bit less than my 8 ply tyres BUT at a max pressure of 42psi instead of the 65psi with mine?

These reinforced tyres were on a brand new Bailey with a total weight of 1400kg which was the same as the total weight the tyres would carry bar about 30kg which is nothing really. These tyres by the way were made in China??



Post last edited on 22/06/2005 00:56:21

Message posted by michael on 22/6/2005 at 9:43pm
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Gallery Images:   3 		hi gary,[:errr:]with all these pressures.the old caravan had 8ply 175x13 tyres,pressure 54psi.the new bailey 500/5 we have MTPLM of 1295kgs is 195kgs heavier than the old van,with tyres of size 195/70 R14.L196,and the pressure is only 37psi[:errr:]

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Message posted by wizard9956 on 23/6/2005 at 12:01am
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>>the new bailey 500/5 we have MTPLM of 1295kgs is 195kgs heavier than the old van,with tyres of size 195/70 R14.L196,and the pressure is only 37psi[:errr:]

Think it goes like this , bigger tyre spreads the load more so needs less pressure to support the load .

atb

Wizard



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Message posted by wizzo1968 on 23/6/2005 at 1:34am
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Hi check this out my post  page 21



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