Just to be accurate here, the pneumatic tyre was invented by John Boyd Dunlop, as he called them "Tyres" I figure that it's only fair to use the
correct spelling of the word in his honour.
The word "tire" is an incorrect version that has sadly been adopted by the US
<Whistles quietly in an innocent manner>
Oh yes, pressures..
25-30 PSI but somehow I suspect that my 3.5" x17" front and 4.25" x17" rear might be slightly differerent pressures than your MX tyres