Tyre Pressure advice Kon Tiki 640/6 (1 Viewer)

[Rusty Pumper]

Howdy Funsters,

I have a 2002 Kontiki, 640L/6 3.85t, 3859kg Gross, 1850kg front, 2120kg rear on 215/75R/16CP Tyres.

I've been looking through the forums. The wonderful @pappajohn several years ago advised inflating tyres to 65 rear and 59 front for 'cool and comfortable' handling.

The tyres are rated (on the drivers door panel), to 80 psi and that's what I and the previous owner have been inflating the tyres to. Is that harmful or incorrect?

Being a newbie to motorhomes, I wondered what the general consensus was? I'm not questioning @pappajohns wisdom at all, I just wondered what the best advice amongst you seasoned motorhomers is, please?

Also how do I private message someone. I'm still getting to know the website. Doh!!! (Thanks)

 

[pappajohn]

Thanks for correcting me

I just replied to a thread stating the wrong pressures

The stated 80psi is the safe maximum pressure for the tyre and wont be suitable for every van.
My 7500kg RV ran at only 80psi all round, with 65psi in the rear air suspension.

 

[pappajohn]

To send a PM, click on the members user name then click 'start a conversation' in the resulting box.

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[Puddleduck]

As @pappajohn said the panel gives the maximum pressures. You need to get the van weighed when it is all packed for a trip - whole van and one axle which will give you the front and rear axle weight (process of subtraction!) Then you need to contact the tyre manufacturer to get the correct tyre pressures. It does vary a bit between the manufacturers.

In the resources section there is a chart provided by Continental.

Get the tyre pressures correct and you get a much better ride.

 

[Rusty Pumper]

Howdy,

Thanks for the clarification above. I'm going to a local weighbridge in the morning. I must say, the forum is a fantastic resource, so glad to have joined it, and greatly appreciating the good advice and prompt replies. Thanks to one and all.

Funky.

 

[wigster]

At least i gave you one good piece of advice Peter , as in join Fun

It is a great forum you are right .

Another thing i would suggest is to check the age of your tyres. On motor homes its not good practice to run on old tyres.

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[Rusty Pumper]

You did @wigster. I hope all is well with you and yours - always.

 

[funflair]

If you divide axle loading from weighbridge by maximum allowed from tyre load rating and then multiply this by the maximum tyre pressure you will get a very close approximation.

Martin

 

[Hellski]

If you divide axle loading from weighbridge by maximum allowed from tyre load rating and then multiply this by the maximum tyre pressure you will get a very close approximation.

Martin

Following all the previous posts on other threads this is what I have done.

Personally found the rears too soft so added 10% to the final calculation and feel much happier with the ride given. Just for info, my final pressure in the rears are currently 10psi less than the manufacturer prescribes. The fronts using the calculations mentioned by @funflair I find perfect and I'm not finding myself cringing after every pothole! I will continue to monitor them via tyrepal during journeys as well as visual inspection for wear.