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Author Topic: Tyres  (Read 1596 times)

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ronnyd

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Re: Tyres
« Reply #30 on: 02 March 2018, 19:22:25 »

An offer he couldn,t refuse. :y
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johnnydog

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Re: Tyres
« Reply #31 on: 04 March 2018, 00:52:27 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
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TheBoy

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Re: Tyres
« Reply #32 on: 04 March 2018, 09:23:59 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
I am racking my brains the last time we had what I'd class bad (in reference to winter tyres) weather here in Blighty.  I reckon it was about 10 or more years ago when we were my outside thermometer was reading -18C, and our water meters kept freezing up.

Obviously, some parts of the country suffered a lot of flooding 2 or 3 years back, but winter tyres wouldn't have helped there.


So I stand by my comments that we do not have enough bad weather here that means a quality summer tyre isn't able to cope.


I bought some snow chains about 10yrs ago for the Omega. So far, the only benefit I can see from them is the extra weight with them in the boot over the rear axle.  Never fitted, apart from to see how to fit them.
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TheBoy

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Re: Tyres
« Reply #33 on: 04 March 2018, 09:27:36 »


We don't really get bad weather here in the UK...

Really?
;D ;D ;D ;D
And to back it up, look how mainstream media have got excited over this cold snap for the past few days, where, to be honest, the only issue has been the wind causing drifts, not the amount of snowfall.

Christ, we had more in early December.
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robson

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Re: Tyres
« Reply #34 on: 05 March 2018, 13:18:41 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.
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Entwood

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Re: Tyres
« Reply #35 on: 05 March 2018, 13:23:15 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.

My TPMS was bleating quite a lot during the cold spell, over 6 psi low in all 4 tyres, until I'd driven about 10-15 miles when they were back to normal-ish....

HUGE difference in pressure when the tyre temp is -6 C to when it is at +7 C, and in the summer they get very much warmer !! It's only since i got the TPMS that I realised just how much the pressures change with temperature ... I "knew" it in the back of my mind .. but had never given it much notice !!

:)
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Migv6

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Re: Tyres
« Reply #36 on: 05 March 2018, 13:27:40 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\
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Doctor Gollum

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Re: Tyres
« Reply #37 on: 05 March 2018, 13:51:39 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\
Nah, more volume in a given space=higher pressure  ;)
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Kevin Wood

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Re: Tyres
« Reply #38 on: 05 March 2018, 14:04:07 »

Did anyone check their tyre pressures during the cold weather.I thought my power steering had failed but found that my front tyres were down to 20 psi I normally have them at 26 psi.I have never noticed this before perhaps our friends in Finland will have an opinion.

My TPMS was bleating quite a lot during the cold spell, over 6 psi low in all 4 tyres, until I'd driven about 10-15 miles when they were back to normal-ish....

HUGE difference in pressure when the tyre temp is -6 C to when it is at +7 C, and in the summer they get very much warmer !! It's only since i got the TPMS that I realised just how much the pressures change with temperature ... I "knew" it in the back of my mind .. but had never given it much notice !!

:)

Interesting. On the other hand, you probably want to be running lower pressures when it's that cold to get a bit of heat into the tyres and provide better grip on snow and ice, so it's perhaps just nature working in our favour?
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Doctor Gollum

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Re: Tyres
« Reply #39 on: 05 March 2018, 14:28:23 »

A softer tyre would provide a marginally greater footprint...

One of those things that can easily be overthought...
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Entwood

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Re: Tyres
« Reply #40 on: 05 March 2018, 15:08:00 »

I would have thought it would be the other way around ? Warmer = expanded, so lower pressures.  :-\

Nope .. tyre changes size by very little so is a, relatively, fixed volume. ...

Charles Law, Boyles Law, Gay-Lussacs  Law.... put together to form the Combined gas laws  and you get

"The ratio between the pressure-volume product and the temperature of a system remains constant"  or PV/T=k or PV=kT

In your tyre the constant k and the Volume V don't change, so if T goes down, so must P ...   :)

I had just never realised by how much P changes with T ...
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tunnie

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Re: Tyres
« Reply #41 on: 05 March 2018, 15:52:19 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.
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Entwood

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Re: Tyres
« Reply #42 on: 05 March 2018, 16:03:48 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.

That's the theory, and why dry Nitrogen is used in aircraft tyres. .....   One of the biggest constituents of "normal" air is water vapour, and it changes volume with temperature by a large degree, it also condenses out, then freezes, at low temperatures. As aircraft tyres are subject to temperatures of -40 odd C at altitude, and they don't warm up much in the descent, IF water vapour was allowed into the tyres it would be a frozen lump at the bottom of the wheel at the point of touchdown, at which point the wheel is still stationary ... it then, very rapidly, gets spun up to a high rotational speed .... that lump of ice would cause MAJOR imbalance and SEVERE vibrations !!! (been there, got the T-shirt.... tyre was severely damaged.. but we expected it .. :) This was a C130 tyre which is HUGE )



I guess car tyres suffer the same, but to a far smaller degree, due to the much lower volume of air.
« Last Edit: 05 March 2018, 16:12:38 by Entwood »
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Bigron

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Re: Tyres
« Reply #43 on: 05 March 2018, 17:01:53 »

Thanks for that explanation, Nige; I thought nitrogen in my car tyres was just another "Emperor's New Clothes" con trick when offered it at Kwik-Shit some time ago!  ::)

Ron.
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tunnie

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Re: Tyres
« Reply #44 on: 05 March 2018, 17:09:07 »

Is that what Nitrogen in tyres was supposed to eliminate, less change in volume with relation to temperature.

Also explains why the 3.2 was a little unsettled leaving work on Tuesday in -4c, after 10 mins or so back to normal.

That's the theory, and why dry Nitrogen is used in aircraft tyres. .....   One of the biggest constituents of "normal" air is water vapour, and it changes volume with temperature by a large degree, it also condenses out, then freezes, at low temperatures. As aircraft tyres are subject to temperatures of -40 odd C at altitude, and they don't warm up much in the descent, IF water vapour was allowed into the tyres it would be a frozen lump at the bottom of the wheel at the point of touchdown, at which point the wheel is still stationary ... it then, very rapidly, gets spun up to a high rotational speed .... that lump of ice would cause MAJOR imbalance and SEVERE vibrations !!! (been there, got the T-shirt.... tyre was severely damaged.. but we expected it .. :) This was a C130 tyre which is HUGE )



I guess car tyres suffer the same, but to a far smaller degree, due to the much lower volume of air.

Thanks, those C130 tyres put things into perspective!
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