Giant momentum Anleitung Seite 27

WARNING: Never inflate a tire beyond the maximum pressure marked on
the tire's sidewall. Exceeding the recommended maximum pressure may
blow the tire off the rim, which could cause damage to the bike and injury to
the rider and bystanders.
The best and safest way to inflate a bicycle tire to the correct pressure is with a
bicycle pump which has a built-in pressure gauge.
WARNING: There is a safety risk in using gas station air hoses or other air
compressors. They are not made for bicycle tires. They move a large volume
of air very rapidly, and will raise the pressure in your tire very rapidly, which
could cause the tube to explode.
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.
CAUTION: Pencil type automotive tire gauges can be inaccurate and should not be relied upon for
consistent, accurate pressure readings. Instead, use a high quality dial gauge.
Ask your dealer to recommend the best tire pressure for the kind of riding you will most often do, and have
the dealer inflate your tires to that pressure. Then, check inflation as described in Section 1.C so you'll know how
correctly inflated tires should look and feel when you don't have access to a gauge. Some tires may need to be
brought up to pressure every week or two, so it is important to check your tire pressures before every ride.
To convert tire pressure from pounds-force per square inch (P.S.I.) into kilopascals (kPa) use the following
conversion chart.
P.S.I.
1
5
10
20
30
40
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.
2. Tire Valves
There are primarily three kinds of bicycle tube valves: The
Schraeder Valve, the Presta Valve and the Woods/ Dunlop Valve. The
bicycle pump you use must have the fitting appropriate to the valve
stems on your bicycle.
The Schraeder valve (fig. 20a) is like the valve on a car tire. To
inflate a Schraeder valve tube, remove the valve cap and clamp the
pump fitting onto the end of the valve stem. To let air out of a
kPa P.S.I.
6.9 50
34.5 60
68.9 70
137.9 80
206.8 90
275.8 100
kPa P.S.I.
344.7 110
413.7 120
482.6 130
551.6 140
620.5 150
689.5 160
Woods/Dunlop Valve
24
kPa
758.4
827.4
896.3
965.3
1034.2
1103.2
Presta Valve Schraeder Valve