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Topic: Help with Caravan Tyre Pressures

spellcaster

04/8/2012 at 7:18pm
Location: Anglesey
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Hello,

I have a single axle caravan its unladen weight is 500kg and fully ladened is 750kg. The tyres are 155 80 r13. I have looked at some tyre charts online but cannot seem to work out the correct tyre pressure. Cab someone help me out please. Carl

mickyd

04/8/2012 at 8:37pm
Location: nottingham
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it would normally tell you the p.s.i it needs in it on the tyre somewhere hope this helps

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tango55

04/8/2012 at 9:22pm
Location: Lichfield
Outfit: Coachman Amara 450

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I don't know if this is any consolation to you but I have checked in one of my old 1992 Coachman handbooks. The nearest model spec I can find with the same size tyres and weights are the Coachman Mirage which had an unladen weight of 636 kgs. & 850 kgs. max. laden weight with tyre size 155 R x 13 reinforced. The tyre pressures are listed as 42 psi. but if you look on the wall of the tyre it should give you a maximum psi. loading which I think would be around 45 psi. This information is provided as a guide only so you still need to find out the exact pressures if possible.

Did this information help?

Post last edited on 04/08/2012 21:46:05

Gram

04/8/2012 at 11:21pm
Location: Padded Cell
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If you look here, you will see:

For tyre size 155 R 13
(Max Speed 100kmh = 62mph)
(load index)78      (kg)935 (PSI)35
(load index)82      (kg)1045 (PSI)42

(Max Speed 130kmh = 80mph = TOO FAST!))
(load index)78      (kg)850 (PSI)32
(load index)82      (kg)950 (PSI)39

So if your van is only 750kg, the top line best applies - 35psi will be ample for up to 935kg. A higher psi may make the tyre a little too hard, making the van bounce a bit more than you want....

Gram

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old chap

05/8/2012 at 9:46am
Location: Sitingbourne
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well tyresafe reckon a recommended load of 765kg at 32psi
for 155Xr13 this allows for their advised 10% safety allowance

http://www.tyresafe.org/tyre-safety/caravan-tyre-safety/load-and-inflation-tables

Gram

05/8/2012 at 2:30pm
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Three lines further down in the www.tyresafe.org link, the table shows 155/80/13 with a load index of 79, max recommended load 787 Kg, PSI 35 - of course, as labelled, this chart is for standard tyres - reinforced and light commercial are different and separate tables apply.....

Gram

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spellcaster

05/8/2012 at 4:40pm
Location: Anglesey
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Hello everyone a big thanks for you all trying to help with these tyre pressures. I did look at the spare tyre and it says on it max load 487kg max psi 50 if this makes any sense the spare tyre also says re-inforced on it. Carnt see that on the others so not sure if there normal tyres or not. But in relation to the caravan empty weight being 500kg and fully ladened being 750 kg is 32 psi ok ? or should it be a little more.

Gram

05/8/2012 at 6:01pm
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Hi Spellcaster,
for 750kg, set your tyres to anything between 32-35 psi - any softer, the tyres can overheat due to too much flexing and that leads (in time) to weakening and possible blow-outs. Too hard, and the caravan will tend to bounce about. The max load quoted on the tyre is for the tyre, but remember - your van load of 750kg is on two tyres, ie 375kg each tyre. You would only need to put in 50psi if you had 487kg on each tyre - meaning a van load of 974kg....

Gram

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spellcaster

05/8/2012 at 7:59pm
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Thanks Gram and everyone for all your help.

arc systems

05/8/2012 at 9:01pm
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There is an important piece of information missing, that is the load index number that follows the size?

155/80R13 79, is a different tyre to a 155R13 78, as is the 155/80R13 83 Reinforced tyre.

So and for 750kg, 155R13-78 is 27psi
155/80R13-79 is 29psi
155/80R13-83 is 30psi

spellcaster

05/8/2012 at 9:25pm
Location: Anglesey
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thanks for that i will check to see what the load index number is tom

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