Regardless of the above, you have illegal tyres on your car. You must replace tyres with at least the same load and speed rating as the originals.
I think every car I have ever owned always has 32psi all round - except when loaded up for a trip
Not so sure about the legal statement here, Oigle...
had a quick check of the Australian national rules (www.infrastructure.gov.au and vehicle standards bulletin 14, national code of practice, and specifically the tyres bit... it says... (and apols for whacking in a pile of text, but if Col's 320 CE is running illegal shoes, then 99% of us are also in the same boat.)
A motor vehicle under 4.5 tonnes GVM which is required to comply with ADR 24 (which just says every car built after 1972 and on Aussie roads has gotta have a tyre placard) may be
equipped with tyres other than those listed on the tyre placard provided that:
the load rating of the tyres is not less than the lowest load rating listed on the tyre
placard of the vehicle or equivalent variant of that model vehicle;
the speed rating of the tyres fitted to a passenger vehicle is at least 180 km/h (S) when
the tyre placard requires a higher speed rating than S;
the speed rating of the tyres fitted to vehicles with special features for off-road use of at
least 140 km/h N when the tyre placard requires a higher speed rating than N; and
for all other vehicles a speed rating of at least 120 km/h.
In special circumstances, the speed rating may be less than the ratings specified above
if the speed rating of the tyre is more than the vehicle’s maximum speed. This will
need to be confirmed with the Registration Authority.
As for the pressures....
Well, my W140 says 27 psi all round on the fuel filler cap, but I have worn out a set of shoes on the sides by doing this. I spoke with the tyrefitter, and while MB did write the specs for the tyre use, his suggestion was to run them all at the max load pressure. In my case 34 all round.
As MB will refer me to 'the book' ie, 27 psi, and a guarantee of premature wear, Im doing a trial for the next 8000km until tyre rotation takes place, when any wear issues due to pressure will be looked at.
I did another thread on this...
The label says H and the tyre says H for the load rating and that is correct.
I would use the lower setting in on the label or the ride can be far too hard
Is it me...the label says 91V, the tyre 91H?
Is it me...the label says 91V, the tyre 91H?
You mentioned H...that's the speed rating.