In my bicycle riding days we would go to 100psi in the tyres for less resistance.Graeme - I sort of agree with you! I ride both road bikes and mountain bikes - road = hard surface = 120PSI, but on the mountain bike on a soft uneven surface it has been proven that you are better with 30PSI and no more than 40PSI. Same as if you are driving in sand, better off with very low PSI so the tire does not dig in - rolls better.
							
						
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