Bedienungsanleitung Kona 2015 (Seite 27 von 40) (Englisch)

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KONA OWNER’S MANUAL

different terrain or weather conditions depends largely

on tire pressure. Inating 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 sufciently 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 inate your tires to that pressure. Then, check

ination as described in Section 1.C so you’ll know how

correctly inated 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 unidi-

rectional 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

tting appropriate to the valve stems on your bicycle.

The Schraeder valve [Fig. 18a] is like the valve on a car tire.

To inate a Schraeder valve tube, remove the valve cap and

clamp the pump tting 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 inate 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 inate. To inate a Presta valve with

a Schraeder pump tting, 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 ts into the Schraeder

pump tting. Close the valve after ination.

To let air out of a Presta valve, open up the

valve stem lock nut and depress the valve stem.

WARNING: 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.

5. SERVICE

WARNING: Technological advances have made

bicycles and bicycle components more complex, and

the pace of innovation is increasing. It is impossible

for this manual to provide all the information required

to properly repair and/or maintain your bicycle. 27

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Kona 2015 Seite 27

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