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Subject Topic: Calculating tyre pressure Post Reply Post New Topic
01/6/2015 at 10:35am
 Location: Holland
 Outfit: None Entered
View jadatis's Profile View Profile   Reply to jadatis Reply   Quote jadatis Quote  
Joined: 23/4/2011

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To prevent me from hyjacking other topics to much, I opened this topic to discuss further on tyre pressure advice.

Little introduction: My name is Peter and username jadatis is from a Dutch namesong "ja dat is Peter" written in my year of birth 1959 and still sometimes referered to in Holland where I live.

End 2007 I got hold of the officially used formula from page 14 from standards manual of ETRTO ( European Tyre & Rimm Technical Organisation) to calculate pressure for a given load. Also the extra's for higher speed then mostly 99m/160km/h and alighnment ( camber angle wheels like this /-\ on the ( imaginary) axle).

Went running with it and learned myself Excell to make spreadsheets for it. Google a lot for tire/tyre-pressure and once came to an article of an American IR J.C.Daws, who described an other way of calculating wich is simpler to use for us and he compares it to the official calculation in Europe and America, wich are different.

In the end I constructed my own universal formula of wich you can make the official and Mr. Daws formula by using other Construction load( Lc and power( X) , and now use my determined X and Lc in formulas used in caravan and motorhome spreadsheet.

Call myself nowadays Tyre-pressure-specialist.

Wil give some links with more information.
And some pictures to begin with.

First is to my One drive that belongs to my hotmail.com adress with same username as here ( has become an alias).
In that much about tyre-pressure , to use a spreasheet first download it by RIGHT-clicking and choose DOWNLOAD. Other means go wrong . Then after download and eventual virus-check, open it in Excell or likewise programm on your computer to use it.

Public map of my one drive with much about tyre-pressure

And here a link to a topic on American RV forum with a way to compare tyres when replacing in wich maximum load is related to speed.

How to compare tires for aftermarket replacement

And now a picture with different calculations .
Logical calculation is what most think is logical so 80% of AT pressure gives 80% of maximum load loadcapacity. and is not even that far off the ever to be constructed ideal formula to laws of nature, and can be seen as LC=0 and X=1.






So I will point to this topic when reacting to other so we can discuss further here.

Greatings from a Pigheaded Dutch self declared tyre-pressure specialist.

In the beginning on this forum I was only able to make 5 posts a year , so it can be that I am not able to react at a sertain moment.

-------------
signed in for tyre-pressure


01/6/2015 at 12:01pm
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View trog100's Profile View Profile   Reply to trog100 Reply   Quote trog100 Quote  
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greeting Mr pigheaded Dutchman.. if there are two things highlighted by lack of user knowledge and copy and paste misinformation they are tyres and batteries..

two things we all depend on but two things most people know little about.. he he

trog


03/6/2015 at 10:12am
 Location: Holland
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It was yust because of this topic, in wich we discussed and hyjacked it by that , that I opened this topic , so we can discuss further here.
the hyjacked topic

But there you still did not come up with exact data of tyres , and those are:
Maximum load or Loadindex.
Kind of tyre to determine the AT pressure.
Speedcode of tyre ( fi N= max speed 140km/87m/h, Q and up max speed 160km/99m/h.

If you can give that I will use spreadsheet mentioned in the American Topic.

For the kind of tyres , I made a picture , wich is incomplete , and for Americans ( so tire instead of tyre) made.
In blue written I am not shure about, and left open I did not found out yet.


Your tyres are probably 8pr (EUR) wich can be compared to D-load USA, but european ETRTO allows exptions in the AT-pressure ( wich is not the maximum pressure) of 65 psi .
But can also be 6PR with 55 psi AT-pressure.

In the topic I assumed your tyres to be N-speedrated, but can be wrong.

on American fora , where I wonder around a lot too,and this is the reason why you will see me writing sometimes tire by mistake ( forgive me), the opposite is happening, there they are scared by the low advices I sometimes give.
On the other hand , they also are scared when my advice goes over the AT-pressure, they also see it as maximum pressure.





-------------
signed in for tyre-pressure


05/6/2015 at 11:40am
 Location: Blackpool
 Outfit: Elddis Supreme
View AVON EAGLE's Profile View Profile   Reply to AVON EAGLE Reply   Quote AVON EAGLE Quote  
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When I am towing - I just put an extra 2lbs pressure in the rear tyres. Lot easier than working through that formula.


05/6/2015 at 6:21pm
 Location: fife
 Outfit: vw t5 adria isonzo
View diesel steve's Profile View Profile   Reply to diesel steve Reply   Quote diesel steve Quote  
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easier to just look in vehicle hand book. far to much jargon hear to easily confuse the average caravanner



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