General 500R tyre pressures

[lazylobster]

Hi all, as per the title.

Running standard 125 tyres on 3.5 wheels. Whats the PSI required please?

Got the slightly heavier 595cc lump in it etc.

Thanks
Rob

 

[the hobbler]

According to the 'Factory' workshop manual, tyre pressures for the standard 500 are:---(light) Front--17.1psi (1,2kg/cm)---rear--23psi (1.6kg/cm) and (full load)--front--17.1psi (1.2kg.c)---rear--26.3psi (1.85kg/cm). The Mk1 '126, which has slightly bigger wheels recommends the same for the front, but 28psi (1.97kg/cm) for the rear. The 126 is a bit heavier than the 500. My suggestion in the light of these figures is to leave the front 'as is' (21psi) and increase the rear by just 2psl.

 

[lazylobster]

Morning Tom, thanks for the response. Will check at the weekend. My thanks
Rob

 

[fiat500]

From experience on standard tyres with the slightly heavier loading of the 650 engine, I agree that you go midway on the Fiat advice on the rear...ie. 25psi. As these pressures are pretty low I find that standard gauges fitted at service station pumps, on inflators or even the dedicated hand-held devices, can give very inaccurate readings. The handling of the car is badly upset when the pressures are wrong, so I opted for a fairly expensive, analogue gauge as supplied by Transair, which is an aviation supplies company.