tyre pressure

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tyre pressure

Post by john boy on Wed Feb 08, 2017 11:05 am

Hi guys, i have a peugeot elddis suntor 120 and cannot find the correct tyre pressure in the hand book anywhere. the tyres are michelin x 215/70 r 15 cp
regards john
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Re: tyre pressure

Post by boxerman on Wed Feb 08, 2017 11:15 am

Not wishing to be unfriendly, but you'd get more accurate responses if you asked on an Elddis forum, rather than an Autosleeper one.

Frank
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Re: tyre pressure

Post by john boy on Thu Feb 09, 2017 9:16 am

thanks mate, didn't know there was 1
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Re: tyre pressure

Post by jadatis on Thu Feb 09, 2017 10:49 am

The advice in the handbook for your CP tyres , is probably 5.5 bar/80 psi all around.
This is for the motorhomes in Europe for driverslicence up to 3500kg/7700 lbs , yust needed on rear axle to cover overloading, wich is not allowed by law , but you must follow the rules of nature for that, to prefent tyre-damage by overheating.
For front this high pressure though would give terrible discomfort and gripp is bad.
Front axle can almost impossibly be overloaded, and front Maximum permissable axle-weight( MPAW,MTA,GAWR) is already lower then that for rear.

I can calculate an advice pressure for you with use of my made spreadsheet, in wich I use an even saver formula then the European Tyremakers use, and wich I got hold of end 2007 and went running with. Sometimes front can even go as low as 3.5 Bar/50 psi for the most used European Motorhomes, and then still comfortable reserve, but then acceptable comfort and gripp.
Because driver and co-driver are sitting close to the front axle , bumping of front wheels is sooner noticed then that of rear wheels.
for fuell saving higher pressure is better , but only 2 tyres lower , and wind-resistence ( sorry for the word, I am Dutch) makes larger part for motorhomes.

so to be short, the advice of motorhome-maker is not always what is best for you, and car maker ( yours Peugeot) often gives lower advice based on the MPAW of the base lighttruck.

The CP tyre is mostly a 8 Plyrated tyre with Pressure needed for maximum load up to 160km/99m/h of 4.75/4.8 BAR/ 69/70 PSI.
And the higher allowed cold pressure  of that 5.5 bar/80 psi is to cover Peack-loads as Michelin once wrote me in answer to my mail-question.  I translate that as overloading that is more rule then exeption for B-driverslicence motorhomes on rear axle.
A Public secret , and pressure advice is based on that overloading, but car- and tyre-makers can not write that, would indicate that they allow it.

So if you can give me those MPAW's and also to make it complete MPV( ehicle)W, and given empty weight , and what you added.
Best would be to weigh the motorhome as you drive it, so with all the persons and load in it, best per wheel, second best per axle.
And also need the maximum speed, you wont go over for even a minute in your use, so be honnest about that.
Will go from 1 axle with 2 tyres on the rear( also front but never seen else on vehicles).

Your tyre-sises I already googled , and found Loadindex 109/1030 kg/2270 lbs maximum load AT 69/70psi up to 170km/h.
These are the data I will use , that 70 psi because in case of daubt always use the highest, and I will go from 160km/99m/h as speed for wich this maxload is calculated.

Then if you give me the data needed, I will give a highest advice with maximum reserve, with still acceptable comfort and gripp, and a lowest advice for the speed you use, so if you measure that cold once , you dont have to worry that you have damaged your tyres by overheating, but fill as soon as possible to the highest advice. In that lowest advice I still include a weightreserve to cover R/L inbalance.

Advice pressure is always for Cold measured, and that is when inside tyre temp = outside tyre( ambiënt) temp , that simple.
so this is not when driven or inside tire temp heated up by sunshine on the black rubber,
Higher pressure in tire by higher temperature by driving , is included in the advice , and tyres and valves can stand this higher pressure.
The advice is given for 18/20 degr C/65/68 degr F. and higher or lower ambiënt temp gives higher or lower cold pressure in tire measured.  When colder you can highen that up for fuel saving, but for savety of tyre not needed, better cooling down of tyre by larger temp-differences.  But never let off air when Ambiënt temp is higher then that 18/20 degr C , the tyre needs that higher pressure then to give lesser deflection , so lesser heatproduction, because cooling down is also worse , because of the smaller temperature-differences between rubber and in/outside tyre air.
Greetings from a "Dutch Pigheaded Selfdeclared Tyrepressure-Specialist"
Peter

Registed to this forum to give this answer, will not introduce me in a seperate topic, because I only react on tyre-related questions.
If its needed, write it and I will do so .
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Re: tyre pressure

Post by Paulmold on Thu Feb 09, 2017 11:15 am

Much easier to check on this Tyresafe page, just scroll down to last page. You will still need your axle weights..

http://www.tyresafe.org/wp-content/uploads/2015/12/motorhome-leaflet.pdf

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