Defender LWB tyre pressures Hot or Cold check ?

I run mine at 35/ 40 for full load on 235/85/16; however I have never really
thought to check pressures when cold only when hot. LR manual says when cold
and pressure is then 3lb more at working temp.

Question is do I inflate to 35/ 40 when cold or make allowance and run them
at this when hot ie top up to 3 below when checking cold.

Tia John H

--


" ..... it is the provenence of knowledge to speak, and it is the privelage
of wisdom to listen"

On Friday 12 August 2005 18:46, Hirsty's([email protected]) wrote in
message <[email protected]>

> I run mine at 35/ 40 for full load on 235/85/16; however I have never
> really thought to check pressures when cold only when hot. LR manual says
> when cold
> and pressure is then 3lb more at working temp.
>
> Question is do I inflate to 35/ 40 when cold or make allowance and run
> them
> at this when hot ie top up to 3 below when checking cold.

Hot or cold, doesn't really matter. Just so long as the left side matches
the right, tyre pressures on Land Rovers with large tyres aren't critical
and can easily be up or down 3psi without you noticing.

Recently I thought a rear tyre (235/85R16) on my S3 looked a little low.
When I checked, it read 15psi.

--
2001 FZS600 - Silver/Black
1974 SIII Land Rover - Hardtop 2.25 Petrol, Green
1954 Ford 100E Prefect - Black

Hirsty's wrote:

> I run mine at 35/ 40 for full load on 235/85/16; however I have never
> really thought to check pressures when cold only when hot. LR manual says
> when cold
> and pressure is then 3lb more at working temp.
>
> Question is do I inflate to 35/ 40 when cold or make allowance and run
> them
> at this when hot ie top up to 3 below when checking cold.
>
> Tia John H
>
Tyre pressures are always specified cold.
How much they gain when hot depends on conditions, whether they have tubes,
driving speed and what the pressure was to start with. With high speeds in
temperatures over 40C, and pressure low to start with, pressure gains of
10-15 would be possible, and tyre failure imminent even though the pressure
was somewhere near recommended when hot.
JD

On Friday 12 August 2005 19:15,
PDannyD([email protected]) wrote in message
<[email protected]>

> On Friday 12 August 2005 18:46, Hirsty's([email protected]) wrote in
> message <[email protected]>
>
>> I run mine at 35/ 40 for full load on 235/85/16; however I have never
>> really thought to check pressures when cold only when hot. LR manual says
>> when cold
>> and pressure is then 3lb more at working temp.
>>
>> Question is do I inflate to 35/ 40 when cold or make allowance and run
>> them
>> at this when hot ie top up to 3 below when checking cold.
>
> Hot or cold, doesn't really matter. Just so long as the left side matches
> the right, tyre pressures on Land Rovers with large tyres aren't critical
> and can easily be up or down 3psi without you noticing.
>
> Recently I thought a rear tyre (235/85R16) on my S3 looked a little low.
> When I checked, it read 15psi.

Bad form, etc, but JD reminded me...

If you're going to be driving your vehicle at the maximum speed and load for
those tyres then you need to be checking your tyre pressures when cold, as
per manufacturer's instructions. DO NOT, under these circumstances, CHECK
THEM WHEN HOT.

*Generally*, (ie: on the school/shopping run) such measures are overkill.

Take my FZS600 motorbike tyres for example - in my normal riding, which is
classed as "sedate" and *WAY* below the rated maximum for the tyres, they
are inflated to "About Right(tm)" but if I were to go on a track day and
push these tyres to their limit you can be sure I'd have the pressures
spot-on.

--
2001 FZS600 - Silver/Black
1974 SIII Land Rover - Hardtop 2.25 Petrol, Green
1954 Ford 100E Prefect - Black