Hi all, Ive been looking at the required tyre pressure of our Lunar Odyssey 462 (2001) 1080 MTPLM and tyre size is 175/13 and I think from reading the chart it said 65psi. it sounds alot to me but being a single axle maybe its correct. Could anyone tell me if this is right pressure please.
This should help in finding the data on your tyre - p11.
This assumes that you have the correct kind of tyre on your van
Phil
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Quote: Originally posted by Andy JC on 12/6/2012
Someone correct me if I'm wrong but I think the formula works like this:
Max psi stated on tyre divided by max weight stated on tyre then multiplied by caravan MTPLM.
Eg
65(psi) divided by 1400kg=0. 043
0. 043 x 1250kg(MTPLM) = 53.7psi
Post last edited on 13/06/2012 00:08:08
Apart from the fact that your values will be halved as they apply to each tyre.
If the load index was 94, this is 670kg. If the max pressure was 65psi then 65/670 = 0.0970149. Multiply that by 600 if the MTPLM was 1200, giving 58.2 psi.
Some say that you can reduce this by 10% for caravans as they sit around doing nothing most of the time, and the lower figure gives them a more comfortable ride - giving 52psi in this instance.
A 175R13C 97 tyre takes 65psi at a pairs maximum load of 1460kg, if this is the tyre? then for 1080kg the correct pressure is 44psi.
The formula always give a higher pressure, not far out close to the tyres maximums but can be way out at say half maximums and below.
In this tyres case the formula comes up with 48psi, that though is suitable for 1140kg