Dynacraft SINGLE SPEED Owner's Manual page 82

Tire pressure is given either as maximum pressure or as a pressure range. How a tire performs under
different terrain or weather conditions depends largely on tire pressure. Inflating the tire to near its maximum
recommended pressure gives the lowest rolling resistance, but also produces the harshest ride. High pressures
work best on smooth, dry pavement. Very low pressures, at the bottom of the recommended pressure range,
give the best performance on smooth, slick terrain such as hard packed clay, and on deep, loose surfaces such
as deep, dry sand. Tire pressure that is too low for your weight and the riding conditions can cause a puncture
of the tube by allowing the tire to deform sufficiently to pinch the inner tube between the rim and the riding
surface. Some special high performance tires have unidirectional treads: their tread pattern is designed to work
better in one direction than in the other. The sidewall marking of a unidirectional tire will have an arrow showing
the correct rotation direction. If your bike has unidirectional tires, be sure that they are mounted to rotate in the
correct direction. NOTE: Some tires may need to be brought up to pressure every week or two.
WARNING
Pencil type automotive tire gauges and gas station air hose pressure
settings can be inaccurate and should not be relied upon for consistent,
accurate pressure readings. Instead, use a high quality dial gauge.
Tire Valves
The tire valve allows air to enter the tire's inner tube under pressure, but doesn't let it back out unless you want
it to. The tire valve on your bicycle is like the valve on a car tire. To inflate the tire/tube, remove the dust cap and
push the air hose or pump fitting onto the end of the valve stem. To let air out of the valve, depress the pin in the
end of the valve stem with the end of a key or other appropriate object.
The Schraeder is like the valve on a car tire. To inflate a Schraeder valve tube, remove the valve cap and push
the air hose or pump fitting onto the end of the valve stem. To let air out of a Schraeder valve, depress the pin in
the end of the valve stem with the end of a key or other appropriate object.
The Presta valve has a narrower diameter and is only found on bicycle tires. To inflate a Presta valve tube using
a Presta headed bicycle pump, remove the valve cap; unscrew (counterclockwise) the valve stem lock nut; and
push down on the valve stem to free it up. Then push the pump head onto the valve head and inflate. To inflate
a Presta valve with a gas station air hose, you'll need a Presta adapter (available at your local bike shop) which
screws onto the valve stem once you've freed up the valve. The adapter fits the end of the air hose fitting.
Close the valve after inflation. To let air out of a Presta valve, open up the valve stem lock nut and depress
the valve stem.
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HOW THINGS WORK