Note that the maximum pressure printed on the side is just that, likely 
for use with maximum loading, not to be exceeded ever. The vehicle has 
it's own tire pressure rating (based on the actual load of that tire, 
tire position (front/rear), fuel economy, handling both wet and dry 
pavement, etc.) that very likely will be much lower. Some vehicles like 
the big Hummer are able to adjust tire pressures on the fly depending on 
surface conditions.

Howard Winter wrote:
> Roger,
>
> (Late reply, as usual! :-)
>
> On Tue, 1 May 2007 10:12:30 +0700, Roger, in Bangkok wrote:
>
>   
>> How is the maximum tyre pressure rating imprinted on the side of the tire?
>>     
>
> It isn't - I believe it's only the USA, Canada and Australia that have a legal requirement for this.  Tyres I've had that *are* marked have a note to the 
> effect that it only applies in those countries - and it's in PSI.
>
> Gauges here tend to be in PSI and Bar, but most people use PSI because that's what they're used to.  Let's face it, there's no practical implication for 
> using any particular unit of measurement - as long as it's on the gauge, you just put the needle on the right number!
>
> Cheers,
>
>
> Howard Winter
> St.Albans, England
>
>
>   
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