Malg56
Free Member
I am new to motorhome, first year, and own a Fiat Adria. the tyre size is 215/70 R15 can anyone advise me what tyre pressure to run them at. Handbook advises around 80psi but local tyre company say it should be around 65.:Blush:
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I am new to motorhome, first year, and own a Fiat Adria. the tyre size is 215/70 R15 can anyone advise me what tyre pressure to run them at. Handbook advises around 80psi but local tyre company say it should be around 65.:Blush:
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[LEFT said:madbluemad[/LEFT];247196]Hi
Your local tyre company is correct. 80 PSI is too high.
Jim
Hi,
I don't think that is a correct answer, you should always follow your manufacturers stated pressures, if you were unfortunately to be involved in a RTA and they felt the tyres may have been a contributing factor, quoting that someone on a web site or a local tyre seller told you to use different pressures than specified by the Motor-home/ base vehicle manufacturer you could be in serious dodo ?
If you read the link given in one of the posts, you will see there is a chart at the end of the document that give pressures against axle loads, some of which are quiet clearly in the 5.5 bar(80psi+-) range depending on your vehicles axle weights,
If you weigh your vehicle and determine the actual axle weights you may well find a lower pressure on this chart, but before you proceed with lowering the pressures given in your handbook you need to determine whether the weight at the time of weighing will ever be exceeded or lowered as, as you will see from the chart this weight fluctuation will change the pressure needed.
You should also read the whole document and not just jump to the chart as it clearly states in the opening paragraphs you should follow the vehicle manufacturers handbook when it comes to tyre pressures
Having looked into this recently along with the type of tyres that can be used I would strongly suggest you follow your handbook as god forbid you were ever involved in a RTA where the tyres could be seen as a contributing fact you would always be in my opinion on the right side, as we are no experts in tyres and pressures and if the handbook tells me that's what it should be why do i as a complete novice in this area want to stick my neck out and say I know better than the manufactures, some people may but I certainly don't.
Just another major item you may want to double check is if the tyres fitted are the same as specified by the manufacturer as camping type tyres can use a higher pressure than most normal van tyres, so it's really worth double checking as a lot of people appear to be fitting non camping type tyres to there motorhomes when it comes time for replacements and if you follow the manufacturers handbook in those situations you could be exceeding the safe operational pressures of the tyres, the link earlier shows you how to check the safe working pressures on the tyres you have fitted.
I am no expert on tyres, its just my opinion, Hope that helps
This is now imo where the confusion starts. If you work out the axle weight to tyre Load Index ensuring that the Speed Rating is covered, there is no better way to ensure that you have the correct tyres and they are at the correct pressure.
The tyre pressures for your mh may well be labelled somewhere on the inside of your mh, mine are and do not comply with the "manufacturers reccomendations".
Dont forget that there are three companies specifiying stuff here. The base vehicle Manufacturer, the Converter and the Tyre Manufacturer, all will give different information depending upon the bit that they have manufactured.
Jim
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This is now imo where the confusion starts. If you work out the axle weight to tyre Load Index ensuring that the Speed Rating is covered, there is no better way to ensure that you have the correct tyres and they are at the correct pressure.
The tyre pressures for your mh may well be labelled somewhere on the inside of your mh, mine are and do not comply with the "manufacturers reccomendations".
Dont forget that there are three companies specifiying stuff here. The base vehicle Manufacturer, the Converter and the Tyre Manufacturer, all will give different information depending upon the bit that they have manufactured.
Jim
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Just to add a little more confusion-my tyres on a Fiat based van are the same as the OP-the plate inside the drivers doors states 79.5 psi.This I duly did at Tescos last Sat, on Tues of this week my tyres were checked by a tyre fitter using a calibrated gauge which he said was accurate-all four tyres gave a reading of 70psi We decided on 65psi in the end-it might be interesting to now check that Tescos.
So,I guess that whatever pressure you decide to use,you need to have an accurate way of checking that and not relying on 'forecourt' gauge which might.or might not,be accurate.
Mike
camping tyres are a con ; if you look at the load and speed indices they are no different to the tyres sold for vans ; if they would carry more weight they would have a higher load index ; the confusion has come from the tyre manufacturers trying to cover themselves because so many motorhomes are overloaded ; if you are told the pressures which are correct for the vehicle at it's maximum approved weight many tyres will be overloaded
so it is quite simple
weigh your axles when fully laden , driver and passengers included
refer to the official ETRTO charts and get the correct pressures for that weight
please remember that there is a dual load index , eg 109/107 and you can find the maximum loads you can carry on that tyre ; the reason for the dual index is that twinned tyres DO NOT carry double the load of single tyres , so if you have twins check that the twinned load in the load index chart is sufficent for your vehicle
if you are overloaded , at the very least make sure that your tyres are not ...it might be ME that you hit
for an illustration I will quote my current vehicle , came fitted with michelin tyres [ never again , but that is another thing ]
contacted michelin ...motorhome ? 5.5 bar on both ends was the response
weighed the loaded motorhome ....in by 40 Kg overall [ phew ]
applied ETRTO pressures
4.5 bar front , 5.0 bar rear
this operates the tyres at the pressure /weight combination for which they are designed , therefore safely
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