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Topic: tyre pressure

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morgan63

26/5/2015 at 10:01pm
Location: shropshire
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Hi ive got a coachman genious 460-4.
Can anyone help with what pressure to put in the tyres please. Thanks.

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Grampian91

26/5/2015 at 10:29pm
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What sized wheels and tyres? Caravans gross weight?

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tango55

27/5/2015 at 1:14am
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I think you will find that the Coachman Genius 460 is a 2 berth caravan with an end washroom.
If so, the wheels will be 13" steel rimmed which should be about the same pressure as my 450 Amara which are 175 x 13 with 50 psi. tyre pressure but I would only use this as basic guide till you can obtain the correct pressures.

Post last edited on 27/05/2015 01:20:53

jadatis

27/5/2015 at 9:50am
Location: Holland
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reacted to follow this topic.
Once you give the needed data , I will calculate it with spreadsheet I made, and give picture of it and extra explanation

Need weight of caravan in vacation loading, second best Maximum permissable vehicle weight.
configuration , most likely 1 axle 2 tires on road.
And maximum speed you wont go over for a minute in your use.

From tyres : Maximum load or loadindex.
Kind of tire to determine the AT-pressure ( wich is not the maximum pressure of tyre).
Speedcode of tire ( often used in Europe Q and N ).
But if you are not shure give sises on sidewall given.

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signed in for tyre-pressure

morgan63

27/5/2015 at 9:26pm
Location: shropshire
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Hi running order 900kg. Max weight 1100kg singal axel.thanks.

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trog100

28/5/2015 at 9:42am
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i run my single van which is 1100kg gross weight and has 13 x 165 commercial tyres on it at 40 psi.. the same tyres could carry a van with a gross weight of around 1500kg but would need to be at their max pressure of 65 psi..

none of this is an exact science.. caravan tyres need to be hard enough so as not too flex too much when in use but not too hard because they stiffen up the already basic suspension too much..

most people over inflate tyres i try not to because it dosnt help a caravans crude rubber suspension which isnt that good at absorbing road shocks in the first place..

trog

jadatis

28/5/2015 at 11:04am
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Quote: Originally posted by morgan63 on 27/5/2015
Hi running order 900kg. Max weight 1100kg singal axel.thanks.

What I make of that is , empty weight 900 kg and maximum permissable vehicle weight 1100 kg.
1 axle 2 tyres on the road

Is that right?

Then I need at least still the tyre data like maximum load or loadindex and AT-pressure
But nice would be speedcode and sises.

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jadatis

28/5/2015 at 11:18am
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Quote: Originally posted by trog100 on 28/5/2015i run my single van which is 1100kg gross weight and has 13 x 165 commercial tyres on it at 40 psi.. the same tyres could carry a van with a gross weight of around 1500kg but would need to be at their max pressure of 65 psi..
none of this is an exact science.. caravan tyres need to be hard enough so as not too flex too much when in use but not too hard because they stiffen up the already basic suspension too much..

most people over inflate tyres i try not to because it dosnt help a caravans crude rubber suspension which isnt that good at absorbing road shocks in the first place..

trog

Because I think I have enaug data from you I have put it in my calculator and gave next picture.
advice 50 psi , but this is officially for maximum speed of 160 km/99m/h wich you wont make with a caravan behind and some reserve that at wich comfort and gripp are still acceptable ( discussable!!). Or maximum speed of tyre wich is sometimes N=140km/87m/h.
If you can give that speedcode I can calculate a lowest save pressure for the speed you drive.

What I now give is highest pressure to fill , asuming all data right, with acceptable gripp and comfort ( for the caravan so screws wont tremble of the woodwork) and maximum reserve for things like, pressure loss in time , misreadings or misjudging of weight and pressure, etc etc.

But OK here the picture

Post last edited on 28/05/2015 11:27:32

Post last edited on 28/05/2015 11:30:13

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trog100

28/5/2015 at 4:30pm
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i run my tow truck tyres (265 70 15) at 30 psi.. lets say max weight of truck is 2500kg.. four tyres at a load of 650kg each..

what does your spreadsheet say for that.. i think your 50 psi is way too high for my van and would rattle my "screws" a little too much for me.. :)

the interesting thing would be to find out just what the margin is between too high and too low..

i admit to targeting the lowest possible pressure as opposed to the highest one.. but i recon your spreadsheet data is producing figures on the high side..

its all too easy just to bung more pressure in to "make sure" which is something in think most people do..

the other thing i would love to do some day is to take a ride inside my van while its being towed i have a strong feeling that i would be shocked at the amount of banging and crashing that takes place inside.. one day i will just to find out.. he he..

trog

Boston600

28/5/2015 at 6:46pm
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I found an original sales brochure for my 1999 van and it says for my model I should be running at just 33 psi.

jadatis

28/5/2015 at 8:18pm
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at trog100

The advice of 50 was for the caravan .
Your van ( car) if realy 2500 kg fully loaded and towing , has more then 650 on rear a tyre.
Most likely division front/rear of 47/53%.
So rear needs higher pressure and front lower in that situation.

And thats the most important, to determine the right weights on axles or better seperate wheels.
To high pressure might give discomfort but is pretty save for the tire so no sudden blow out .
To low pressure is even verry comfortable but gives tire damage and chanche on blow out .
A ting you sertainly dont want.
If you know exact weights you can set the pressure with less reserve but as long as you estimate it better to high then to low.

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signed in for tyre-pressure

Ratherbeinapplecros

28/5/2015 at 8:34pm
Location: Kelso
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Quote: Originally posted by Boston600 on 28/5/2015
I found an original sales brochure for my 1999 van and it says for my model I should be running at just 33 psi.

Glad someone has pointed this out. I am a patrolman for a major breakdown operator and have in the last month been out to two caravans with blown tyres. When I checked with the members both had received advice online to inflate tyres to 60 psi. This on both occasions has led to the tyres failing as if they had read the sidewall of the tyre they would have noticed the max pressure in both cases was 54 psi.
And these were both the proper c rated tyres.
So please guys and gals get the correct manufacturers pressures and stick to them to hard can be just as dangerous as to soft

trog100

28/5/2015 at 9:59pm
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"The advice of 50 was for the caravan"

yes i know it was and i also said (kindly) that it was a tad high.. actually its way high.. :)

i was curious to know what you (or your spreadsheet) would come up with for my tow truck.. equally too high i am sure.. he he..

trog

jeff juke

29/5/2015 at 1:37am
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trog100

29/5/2015 at 10:23am
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the article seems to be about never exceeding maximum pressures.. not very helpfully as regards ideal pressures..

the bias seems to be blow them up as hard as you can minus 10% of the max pressure..

my vans actual axle load is 1000 kg.. my light commercial tyres could carry %50 more than this.. close to 1500 kg at a max pressure of 65psi and at speeds much higher than the maximum allowed UK caravan speed..

i am not even vaguely interested in how hard i can get away with as regard blowing up my tyres.. i am very interested as regards how low i can get away with.

maybe i have seen the contents of my fridge ending up on the floor too often but keeping road shock down to a minimum is my desire so is not blowing up my tyres any harder than i have to..

last year i covered over 4000 towing miles (at 40 psi) on some very bumpy country lane type roads.. every time i hit a pothole even at low speeds i am very aware of my poor old caravans inadequate suspension..

so for me its how soft i can get away with and not how hard.. he he..

as for my caravan tyres.. they do have an easy life.. they could be blown up much harder on a transit van carrying much more weight and blasting around at 80 mph driven by a white van man.. :)

trog

jadatis

30/5/2015 at 9:32pm
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Quote: Originally posted by trog100 on 28/5/2015"The advice of 50 was for the caravan"

yes i know it was and i also said (kindly) that it was a tad high.. actually its way high.. :)

i was curious to know what you (or your spreadsheet) would come up with for my tow truck.. equally too high i am sure.. he he..

trog

For the car its more complicated, will have to know weightdivision etc and some low H/W division tires are give to low maximum load. For low H/W tires the lowest save pressure would probalby still give bumping.

But for your caravan if realy only 1000 kg, and speed sertainly no minute above 100km/62m/h, I added 4 LI steps so 98+4=102 , then still 107 kg combined overload and weightdifference R/L a pressure of 40 psi is the outcome.

And thats the tricky part of it all , is your real weight realy 1000 kg.
Most caravans nowadays are a bit overloaded to the maximum allowed ( so yours 1100 kg) and always weightdifference R/L , 80 kg is no exeption.

Its always better to give to high advice so no damage to tyre and no accident and no death people , the discomfort is not unsave .
And my 50 psi advice is still lower then what the trailer advice is nowadays of AT-pressure of here 65, and not more then 10% lower so 58.5 psi.

So at that point we are in the same line, but I dont dare to advice that low as you do.

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signed in for tyre-pressure

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