Tyre Pressures
I have Tyrepal sensors on my motorhome wheels which work quite well. What I have noticed is that after the warmth of summer the pressure have fallen a bit. Front 55 to 51 psi and the rear 80 to 75 psi. Just wondered what the collective wisdom is about leaving
them as they are, after all less than 10% below normal so should I inflate or are they safe to leave at the lower rating. I know some people reduce the rear setting anyway but not heard that about the front. We are going to Chatsworth next week for 3 days
so we will be travelling fairly light. Whilst the sensors are excellent at giving you information they are a right pain to adjust pressures but obviously safety comes first.
David
Comments
-
David, does anyone on CT run the rear pressures at 80psi other than White Van Man...?
neither of the two major camper tyre manufacturers (Pirelli or Michelin) recommend this level when been supplied with 'normal' range axle weights....
all you need to do is consult their charts (googlable) and the appropriate pressures are available.
the 80psi figure is the default limit set for fully (over) loaded white vans...
what are your axle weights?
i run at 55 front, 65 rear.
0 -
Hi David, I do not adjust my tyres to take account of seasonal changes, I'd be interested to hear what others say. I do agree with BoleroBoy though on pressures, I run my Bailey 745 on 55 front, 65 rear. I confirmed these pressures in the Alko chassis manual.
The quality of the ride is much improved.0 -
I also run my tyres according to the handbook weight chart after weighing the motorhome in a fully loaded state at my local weigh bridge, 55psi front 65psi rear. I do adjust for seasonal changes which may not be very wide in the UK but if you travel abroad
the difference can be significant. Nevertheless it would be interesting to know the tolerances tyre manufacturers allow from their recommendations.peedee
0 -
Last January when I was travelling to Spain, the overnight temperature in central France was well below zero. When I started the MH one morning the Tyrepal alarm went off, much to my consternation.
I did a quick visual inspection and all seemed okay, so I set off cautiously with the alarm bleeping. Fortunately, the temperature of the tyres rose gradually and after a few miles the alarm stopped.
Until that experience, I hadn't realised just how much tyre pressures fluctuate with temperature - it just goes to reinforce the advice that tyre pressures should be checked when outside temperatures are normal.
0 -
Normal for where you are would be a good start.
0 -
David, does anyone on CT run the rear pressures at 80psi other than White Van Man...?
neither of the two major camper tyre manufacturers (Pirelli or Michelin) recommend this level when been supplied with 'normal' range axle weights....
all you need to do is consult their charts (googlable) and the appropriate pressures are available.
the 80psi figure is the default limit set for fully (over) loaded white vans...
what are your axle weights?
i run at 55 front, 65 rear.
Write your comments here...BB as I sated in another thread Michelin told me 65 front and 80 rear but htese are still a bit harsh so where are these tyre presure charts please, I tried to google but to no avail?
0 -
Michelin also told me 65 front and 80 rear. The ride is very harsh. I tend to reduce the rear a bit to 72 which makes it a bit better. I have had the motorhome on the weighbridge and the rear axle is not that far under maximum load so I don't want to
reduce pressure too much.0 -
so where are these tyre presure charts please, I tried to google but to no avail?
I get mine from the chassis makers hand book. Sometimes you can find these online but mine came with one.
peedee
Write your comments here...Its a Fiat chassis and it says 80 front and rear but thats the standard Ducato setting. BB mentioned Michehave pressure charts on line but I cannot find them.
0 -
michael, i first came across them (transposed into...?) in a thread on MMM.
the thread may still be googlable....
0 -
so where are these tyre presure charts please, I tried to google but to no avail?
I get mine from the chassis makers hand book. Sometimes you can find these online but mine came with one.
peedee
Try googling 'amc chassis manual all-ko'.
0 -
As I've posted in the past Michelin are moving to the 'one answer suits all' that 80PSI is standard advice for all rear axles!
There is a chart and Google may find it...I can't insert my image of the chart on this forum.....advice not required Thank you.!!!!!!!!
0 -
Is this what people are looking for? Manual
David
0 -
Tyre pressures are load specific and Bridgestone quickly and helpfully provided pressures of F48 R42 for my van based on real-world axle weights from a weighbridge. In fact because normally the loads would be closer to equality on the front and rear axle
I normally set all four tyres to 50psi which is above tyre specialists figure but well below manufacturers "one size fits all" of 60F 65R. At that pressure van feels comfortable and stable and at 32K miles tyres have a lot more miles in them0 -
Our Autotrail weighs 3850kgs and we have Muchelin Agilis tyres all round we were told to run them at 80 psi but I felt this was too high so after a bit of research we now run th back tyres at 75psi and the front at 65psi I find this much better. I did notice
when I checked them last week that the rear ones had dropped to 70psi and I did think that could have something to do with the weather.0 -
there is no point whatsoever in a 'MV handbook' stating recommended pressures unless it provides a table for specific axle weights and the owner actually weighs the van, so as to make use of it
a van like ours has around a tonne of payload (MIRO approx 3250, MTPLM 4250) so that gives a huge variation in actual running axle weights depending if the van is very lightly loaded or 'rammed'....
so, a manual with one 'recommendation' is pointless.....
0 -
there is no point whatsoever in a 'MV handbook' stating recommended pressures unless it provides a table for specific axle weights and the owner actually weighs the van, so as to make use of it
a van like ours has around a tonne of payload (MIRO approx 3250, MTPLM 4250) so that gives a huge variation in actual running axle weights depending if the van is very lightly loaded or ''....
so, a manual with one 'recommendation' is pointless.....
...
yet again some one questioning a manufacturers figures which if not correct would leave tham open to litigation0 -
please describe how a manufacturer/converter can assess the load on each axle (without having knowledge of what or who is in the vehicle) and therefore the required pressure?
an empty 6 berth van with just a driver, might weigh half a tonne or less than one fully occupied and a loaded garage
...and what about of an owner switches from, say, michelin to Continental or Pirelli...where the same load might result in different recommended pressures.
so, instead of referring the owners to the tyre manufacturers for a proper safety driven recommendation based on real data (axle weights) they come up with a one size fits all....except it doesnt
so, who knows best.....someone like bailey or swift, who know nothing of the specific customer tyre loading, or the tyre manufacturer who has all the pertinent data?
0 -
please describe how a manufacturer/converter can assess the load on each axle (without having knowledge of what or who is in the vehicle) and therefore the required pressure?
an empty 6 berth van with just a driver, might weigh half a tonne or less than one fully occupied and a loaded garage
...and what about of an owner switches from, say, michelin to Continental or Pirelli...where the same load might result in different recommended pressures.
so, instead of referring the owners to the tyre manufacturers for a proper safety driven recommendation based on real data (axle weights) they come up with a one size fits all....except it doesnt
so, who knows best.....someone like bailey or swift, who know nothing of the specific customer tyre loading, or the tyre manufacturer who has all the pertinent data?
..I would think in the case of the M/van we had ,them , as the handbook stated they worked with the tyre company
0 -
there is no point whatsoever in a 'MV handbook' stating recommended pressures unless it provides a table for specific axle weights and the owner actually weighs the van, so as to make use of it
a van like ours has around a tonne of payload (MIRO approx 3250, MTPLM 4250) so that gives a huge variation in actual running axle weights depending if the van is very lightly loaded or ''....
so, a manual with one 'recommendation' is pointless.....
...
yet again some one questioning a manufacturers figures which if not correct would leave tham open to litigationNot so JVB. The advice given by the manufacturer is just that - advice. It is the responsibility of the driver to ensure the safe operation of the vehicle. If a lower or higher tyre pressure is chosen and is thought to have caused an accident the
prosecution would have to prove that the choice was wrong in all the circumstances.Moving on, I base our MH tyre pressures around the advice received from Michelin based on the actual axle weights. I also use temperature as a guide. A quick walk around the van after about 10 miles driving touching each tyre tells me a lot. The
tyres should be comfortable warm about 45-50 deg C. Too hot indicates stress (too much flexing), and too cold indicates too hard...You are saying that the TPs that were given in a handbook for each model is not correct?
0 -
a hand book guide might be better served if (as a minimum) it suggested a range of pressures....along the lines of 'empty' or 'full' etc....
with such wide ranging allowable van weights, a single handbook recommendation can only be 'right' in one circumstance...
the thing is, without the handbook explaining which particular circumstance, the poor old customer has no chance....
0 -
Generally speaking yes, but I'm sure there will be quite reasonable exceptions.
...So our car handbook with tyre pressures for our vehicle are not really correct? that would be interesting to accident investigators,or when pulled over for roadside checks
0 -
Generally speaking yes, but I'm sure there will be quite reasonable exceptions.
...So our car handbook with tyre pressures for our vehicle are not really correct? that would be interesting to accident investigators,or when pulled over for roadside checks
...but dont they say 'laden', 'unladen' etc?
om sure my old Audi handbook had differing recommended pressures based on load or number of occupants.
dont see why this cant be used for MH...though basing on actual axle weights is far better
0
