We have a 450S Monza which my parents are away in at the moment - so the handbook is with them. However, whilst I can't currently check what the handbook says I know that for the past 18 years I've fitted ours with reinforced tyres and run them at 42 psi.
If you are using tyres that aren't reinforced I'm sure the psi is lower.
Our Monza is 700kg unladen and 900kg fully laden - so that's not very different from yours. I seem to remember it came with non-reinforced tyres when new and the tyre pressure in the book was 36psi for those tyres.
This will be its last trip before I take it apart for spares as it's getting past the point of viable maintenance/repairs.
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Topic: Confused with tyres and pressures
