Some very mixed advice on here amongst the good stuff, it not surprising many are confused.
Mine are run at 65psi per manufacturers recommendation
Ensuring they are pumped up correctly and in good condition will always be preferable to those who never check and run at hugely underpumped levels . Those are the people far more likely to have a puncture than those with good tyres pumped to recommended limits which may or may not be close to tyres recommended limit (that is irrelevant)
Thank you all for your replies on my question
"We usually put in the pressure that is on the tyre wall, is this wrong?" I will pass this on to my husband and hear this in mind in future.
PS Arc Systems, we have been to you several times with problems with our Bailey 2000 water heater and you have always been excellent. So anybody who has problems with one of those contact Arc Systems. We have changes our van now to a 2007 Avondale and its a different heater. Thanks for all your help in the past.
Thank you Sue, sorry I didn't make the connection!
But you still seem to labour under the idea of putting the maximum pressure in that's stated on the tyre?
I've wrote plenty above as to why doing this is wrong, but to be perfectly clear..
This is not 'my' advice or indeed opinion and albeit obviously I totally agree with it, I am simply passing on the tyre manufactures knowledge gained from many emails and phone calls for my own benefit with experts in this field.
You are though 100% right about the water heater you now have, don't touch them!, however, I certainly do the heating systems, gas fire and particularly the electric side
all the figures on a tyre are maximum figures.. a max pressure which is directly related to a max load and a max speed all at the max load and max pressure..
what is interesting is where did the idea that its best to blow a tyre up to the highest possible max pressure come from..
one can also assume that these max figures have a safety margin built in.. but its all only really relevant at the maximum rated speed.. change any part of the equation and you change them all..
limit the speed to 20 mph max and all the other figures no longer apply.. with caravan the speed is limited to 60 mph and not 90 mph.. the other common myth is that caravan tyres are working harder than car or truck tyres.. they are not.. most of then have a very easy life..
Right here we go 2000 lunar lexon EB SINGLE AXLE MTPLM IS 1340KG MRO1005KG I just want to know the correct tyre pressure Lunar recommend cant find info anywhere please help getting fed up with max 65 psi for 175 r13 c which is on tyre wall
Well there are two load index for the 175R13C size tyre, 97, the old 8ply, and 94 which was 6ply.
Yours will be 97? in which case 57psi is good for 1315kg and 60psi for 1368kg so for 1340kg 59psi tops.
At the Miro of 1005kg, required pressure would be lonly 46-7psi
Given your very high loading limit here's a few more recommended pressures you should find useful
For particularly Sue, sorry for mixing you up with original poster so an Edition regards yours and other vans of similar age and older.
Caravan manufacturers always used to fit tyres barely adequate for the purpose, ie fully loaded therefore requiring maximum pressure as marked on the tyre.
This had been in direct conflict with the tyre manufactures advice to allow a minimum of 10% excess in the tyres fitted so the tyres were not fully loaded and would not then need the maximum pressure.
Since then the latter half of 2000's, one by one the caravan manufactures have fallen in line and as far as I know all follow the 10% advice so now days all should use less maximum than the pressure.
Somehow though Sue, I expect at 2007 yours may well follow the old practice so max pressure in one sense is probably correct.
As a very common example, if your tyres are 195/70x14 with a 96 load index? and using 42psi? (a very common size on vans back then but scarce and expensive now).
These today and depending on weight of van, are far better replaced with 175R14C 99, or 185/75R14C 102 to give near identical diameter but with a greater load margin.
(185R14C 102 can also fit but a little larger so lift the van a little).
Both/all though may be cheaper but certainly easier to find, require different pressures and all higher than 42psi! but a lot less than this type tyres maximum of 65psi.
Sorry if this is all too much information for some but I consider informed choice is far better than the alternate?!
Quote: Originally posted by arc systems on 25/1/2015
Well there are two load index for the 175R13C size tyre, 97, the old 8ply, and 94 which was 6ply.
Yours will be 97? in which case 57psi is good for 1315kg and 60psi for 1368kg so for 1340kg 59psi tops.
At the Miro of 1005kg, required pressure would be lonly 46-7psi
Given your very high loading limit here's a few more recommended pressures you should find useful
Hi Gary at Arc. Thanks for your response. We have managed to get hold of a manual and in that it says 65 pressure. Our tyres are 175R14C 99/98P. The original tyres on our van were 175R14C 99N.
Both the same tyres Sue and to use the tyres maximum pressure of 65psi would/should mean the vans MTPLM is 1550kg?
The N BTW is for maximum 87mph and P is 93mph so both way above what you are towing your van at and that 6mph difference between them is obviously slight
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Topic: Tyre pressures
