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Recently purchased a new Autotrail Cheyenne 740S, and advised to get the wheels balanced and tracking checked in an attempt to resolve another problem.
Both incidently had to be rectified at a cost of £98 to me. The mechanic who was very thorough asked me to check the vehicle's handbook for the correct tyre pressures.
The tyres:- Continental Vancocamper 225/75R16CP 116R, stipulated max. pressure 69psi. However the handbook stated 5.5 bar (+ or - 0.5 bar), which in old money is 79 psi. The mechanic very unhappy about inflating to this pressure asked me to double check with the manufacturer.
On my return journey home, I found that the vehicle still had its original problem. I contacted Autotrail to report the fault and queried the tyre pressures, and was told to contact the tyre manufacturer as they do not advice which tyre pressures to use.
Not happy with driving on incorrect tyre pressures and having a substancial journey looming, I contacted Continental Tyres this morning who were very helpful. Continental needed tyre details and front and rear axle weights, which are easily found on the plate under the bonnet - According to them the tyres should be inflated as follows:- Front - 4bar = 58psi. Rear - 4.75bar= 68psi. So an urgent trip was made to our nearer garage/airline.
I have 66PSI front and 68PSI rear, but not quite sure you can gain the correct running weight from under the bonnet, would recommend you fully load it and weigh the front axle then the rear axle on a weigh bridge.
A lot of ducking and diving by manufacturers on this point.
Hi if you have another look at the tyre you will see there is another mark that says when it is used on a camper the max pressure is 5.5 bar (79psi) because of the high loading.
On the passenger side door shut it also says 5.5 bar as well as the handbook this alows max loading for the axels.
The correct tyre pressure is the one shown on the passenger door shut. This is standard practice for all commercial based vehicles and is the one that would be used in any official roadside check.
It is highly likely that the pressures shown on the door shut are different from those shown on the plate under the bonnet. This is because the ones under the bonnet are for the base vehicle and the ones on the door shut are adjusted for the potential MGW of the vehicle as suggested earlier.
In the latest C&C(Oct'0 magazine; in the reply, by the tech guru,to a similar question ;there is this gold nugget of info:
October is Tyre Safety Month and there is loads of info to be had online from including a downloadable leaflet re motorhome tyres (pressures according to tyre type and axle load).
Download it;print it off and you'll be able to make sense of it all at last!!
Safe travels everyone
I also queried the door pillar tyre pressures on my 3300Kg Mooveo/Fiat, but after due consideration and trying out I am actually, within 1 psi, sticking to the advised pressures.
These are 79 rear and 73 front and whilst the ride is a bit on the firm side it is not excessive.
The Punctureseal guy never turned a hair, or queried the pressures, when re-inflating last week after the treatment, so he obviously did not find it unusual.
Personally I would sooner be slightly over inflated than under (fuel consumption, tyre wear etc), though no doubt someone will tell me that's wrong.
______________________________________________________________ Forgotten, but not gone.
I was apathetic but now I can´t be bothered.
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