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Tyre Pressures


charlie swift
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when inflating the towcar tyres do you just put the maximum - on the VW Passat it shows on the inside of the fuel cap "normal" running tyre pressure 32psi all round and then with a picture of 3 people and says 41psi rear and 35psi front - are these the correct pressures for towing the caravan ?

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With my Skoda, the handbook says for towing use full load tyre pressure. Normal 32psi all round, towing/full load 35psi front 44psi rear.

Škoda Octavia Estate 2. 0TDi 4x4 towing a Compass Omega 482.

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Yep, that's what I do. Makes a difference in stability. IMHO I think it makes less of a difference to stability with low profile tyres as the side walls are that much shallower, but I would think that it helps the tyres absorb the extra load.

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Problem for the car makers is that they dont know wich weight you have on seperate tyres.

That is why they use MPAW ( max perm axle weight) for normal use, asuming that you are not allowed to go over that. but after 2000 they realized that rear axle often is overloaded or at least by one tire because of unequall loaded R/L. That is why their advice is for maximum load of tyre wich is for normal car tire 36 psi for european tyres, or even maximum allowed pressure of tire wich varies between 44 and 51 psi. This maxloadpressure is not the same as the maximum pressure wich they only give on normal car tyres.

 

This means that if you can produce the exact load on the seperate tyres in the situation you use, that probably a lower pressure can be used then even that maxloadpressure.

Only way to do that is to weigh the seperate wheels fully loaded so with caravan atached.

Second best is axle-weighing but then some more reserve must be used.

 

but if you give here those MPAW and MPVW ( V for vehicle) and exact maximum load and tyre kind of your tires of car, I can calculate a pressure for you.

 

greatings from a Dutch self declared tyre-pressure-specialist

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