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Pressure
From WikiPedalia
The hardness to which a tire is inflated. This is commonly measured in PSI (pounds per square inch), BAR, or kPa (kiloPascals.)
Small changes in tire pressure can have major effects on the ride quality and performance of a bicycle. It is best to experiment with different pressures to find out what works best for your particular combination of tire width, weight and surface conditions.
Tire pressure is much more important than, for instance, frame material in determining how your bike will ride.
For details, see the article on Tires on this site.
See also the article on Flat Tires on this site.
