Bedienungsanleitung Specialized 2007 (Seite 37 von 60) (Englisch)

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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.

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 two kinds of bicycle tube valves: The Schraeder Valve and

the Presta Valve. The bicycle pump you use must have the ﬁtting appropriate to

the valve stems on your bicycle.

Fig. 18a

Fig. 18b

The Schraeder valve (ﬁg. 18a) 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 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 (ﬁg. 18b) 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 on to the valve head, and inﬂate. To inﬂate a Presta valve with

a Schraeder pump ﬁtting, you’ll need a Presta adapter (available at your bike shop)

which screws on to the valve stem once you’ve freed up the valve. The adapter

ﬁts into the Schraeder pump 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.

WARNING: We highly recommend that you carry a spare inner tube

when you ride your bike. Patching a tube is an emergency repair. If

you do not apply the patch correctly or apply several patches, the tube

can fail, resulting in possible tube failure, which could cause you to

loose control and fall. Replace a patched tube as soon as possible.

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Specialized 2007 Seite 37

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