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 tyres 
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
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Location: Exeter, Devon
Post Re: tyres
Something else to consider, is whether the tyre has warmed up when you test it.

I was looking on the internet for tyre pressures for my motorbike as it had non standard tyres fitted. I stumbled across a forum where two chaps were discussing the subject and one was saying the correct pressure was when the increase of warm versus cold was a specific %.

On another site regarding caravans, the advice was the difference between warm versus cold should be 6 psi.

And, does anyone know if the standard recommended psi is at warm or cold?

http://www.gnschassis.com.au/tyre-pressure-calculator/

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December 24th, 2018, 12:56 am
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Firing on two.

Joined: April 9th, 2010, 12:21 am
Posts: 420
Location: West Sussex
Post Re: tyres
samfieldhouse wrote:
Well yes, but there's nothing 'official' for them. Apart from maybe Mehari because I think they had them from the factory?

AK and Ami had 135 from the factory.


December 24th, 2018, 1:41 am
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Joined: April 20th, 2017, 10:55 pm
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Post Re: tyres
Roger V wrote:
(snipped)
And, does anyone know if the standard recommended psi is at warm or cold?
http://www.gnschassis.com.au/tyre-pressure-calculator/


Usually cold.

Pressure variances cold vs hot:
https://www.tirerack.com/tires/tiretech ... ?techid=73
https://www.tirebuyer.com/education/tir ... emperature


December 24th, 2018, 8:00 am
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Firing on two.

Joined: February 10th, 2009, 10:12 pm
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Location: viseu - PT
Post Re: tyres
Derek, thanks for the articles.
Although we all know we must check air pressure periodically, this article shows us why that is so important.


December 24th, 2018, 12:23 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
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Post Re: tyres
vitor
Could be why there are different pressures on front and back. Guessing the front tyres work harder and get hotter which increases the tyre pressure and also compensates for the engine weight.

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December 24th, 2018, 4:17 pm
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Firing on two.
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Joined: February 9th, 2009, 11:27 am
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Location: Copenhagen, Denmark
Post Re: tyres
vitor wrote:
Driving at such low pressure will increase fuel consumption and probably damage the tyres. I never understood why this Revue suggests these numbers... ;)

My user manual says 1.4 front, 2.0 at the back

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December 26th, 2018, 8:28 pm
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Firing on two.
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Joined: February 11th, 2009, 12:32 am
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Post Re: tyres
What are these 'bars' of which you speak?

:lol:


December 26th, 2018, 8:54 pm
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Joined: March 21st, 2013, 12:04 am
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Post Re: tyres
Prefer psi, but dislike bars. ;)

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December 26th, 2018, 9:39 pm
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Firing on two.

Joined: February 10th, 2009, 10:12 pm
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Location: viseu - PT
Post Re: tyres
Even considering the warming of the front tyres due to rolling, traction and steering I guess the 20 front pressure won't ever reach 30psi.

There must be some reason. I don't think Citroen engineers were incompetent...


December 26th, 2018, 11:37 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
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Post Re: tyres
Vitor,
it seems to me that you haven't taken into account the diagonal transfer of weight which takes place during cornering.
Depending how 'enthusiastic' that manouevre is, the amount of load transferred can be as much as 100%, which means that the most heavily laden tyre on the car will be the one on the front axle, at the outside of the curve...



vitor wrote:
Even considering the warming of the front tyres due to rolling, traction and steering I guess the 20 front pressure won't ever reach 30psi.

There must be some reason. I don't think Citroen engineers were incompetent...

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December 27th, 2018, 2:43 am
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