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 Topic: tyre pressure
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26/5/2015 at 10:29pm
Location: Midlands
Outfit: Mondeo Avondale Gram
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What sized wheels and tyres? Caravans gross weight?
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27/5/2015 at 1:14am
Location: Lichfield
Outfit: Coachman Amara 450
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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
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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
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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
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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.
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28/5/2015 at 8:34pm
Location: Kelso
Outfit: Hi gear oasis 6 swift conqueror
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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
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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
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29/5/2015 at 1:37am
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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
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