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Author Topic: Tyre Pressures  (Read 2887 times)

Offline mcmaddy

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Tyre Pressures
« on: 02 December 2014, 17:18 »
Do people adjust tyre pressures for a drop in temperature?
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Offline itavaltalainen

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Re: Tyre Pressures
« Reply #1 on: 02 December 2014, 19:10 »
no.... just check as normal every other week or so...
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Offline mcmaddy

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Re: Tyre Pressures
« Reply #2 on: 03 December 2014, 07:29 »
I check mine every week but if it's 1 degrees today and you set your tyres correctly and then it warns up to 10 degrees tomorrow your pressures are way over from the increase in temperature.
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Offline corgi

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Re: Tyre Pressures
« Reply #3 on: 03 December 2014, 08:40 »
That change of temperature would result in a difference of less than 4%... so not really "way over"

Just check them regularly, as normal.
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Offline mcmaddy

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Re: Tyre Pressures
« Reply #4 on: 03 December 2014, 08:55 »
Funny how 36psi all round at 2 degrees relates to approx 38-39psi at 10 degrees which to me is easy over!
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Offline corgi

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Re: Tyre Pressures
« Reply #5 on: 03 December 2014, 12:15 »
If you do the maths... the difference is less than 4%... what were you using to measure the pressure each time?

The difference can be calculated using elementary A-Level Chenistry or Physics...

The temperature difference in absolute terms is small 274K to 283K...
« Last Edit: 03 December 2014, 12:17 by corgi »
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Offline Jammy1

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Re: Tyre Pressures
« Reply #6 on: 03 December 2014, 12:35 »
Quote from: corgi on 03 December 2014, 12:15
The difference can be calculated using elementary A-Level Chenistry or Physics...

...but not A level English.  Sorry, I couldn't resist :evil:  :wink:

I'm naughty and only check every month.  In my opinion as long as you don't keep the same pressures in the height of summer as you do in the depths of winter there isn't going to be that much fluctuation during a week/month for a road car.
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Offline fredgroves

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Re: Tyre Pressures
« Reply #7 on: 03 December 2014, 14:28 »
(stupid question time)

Won't actually driving change the temperature of the tyre anyway and change the resultant pressure anyway? Maybe only a few percentage points, but roughly the same amount you are debating here?

(/stupid question time)
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Offline mullermn

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Re: Tyre Pressures
« Reply #8 on: 03 December 2014, 14:48 »
This is the logic underlying the use of nitrogen for filling tyres, isn't  it?

Is the TPMS system any good for this type of monitoring, or is it really necessary to manually check that frequently too?
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Offline fredgroves

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Re: Tyre Pressures
« Reply #9 on: 03 December 2014, 15:40 »
TPMS should work, but I have no idea what sort of sensitivity it has (eg can it detect 1 psi difference or only 10 psi - not that it will be a "psi test" it will be a percentage turning speed difference that might equate to a psi figure)

Anyone had any experience of manually checking, finding small differences and not seeing TPMS b!tching?
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