Originally Posted by
Mr. Thompson
http://support.brompton.com/entries/...r-my-Brompton-
Schwalbe Marathon
Front: 60 to 75 PSI, 85 PSI max.
Rear: 70 to 85 PSI, 85 PSI max.
Tire pressure is not only dependent on weight, but also weight distribution.
Riding on rough pavement without suspension requires that you allow the bike to move under you a bit. Keep your cadence up and shift some of your weight to your legs, allowing your hands and sit bones to float over the bars and saddle.
I checked the side of the tire again and it's marked 65-110psi for the Marathon. But I will keep it within the suggested range indicated on the chart.