Bedienungsanleitung Cervelo Multi-speed racing bicycles (Seite 27 von 40) (Englisch)

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Cervélo Owner’s Manual

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.

The Schraeder valve (fig. 12) 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. 12) 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: 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.

3. Clincher and Tubular Tires

There are primarily two kinds of bicycle tires: The Clincher Tire and

the Tubular Tire. Clincher tires are shaped like a “U” in cross section,

with wire or Kevlar beads on the outer edge of both sides that hook

onto the rim and hold the tire in place on the wheel over the inner

tube. Tubular tires do not have beads – the outer edges of the tire

are sewn together around the inner tube, which is then glued to the

rim to hold it in place.

Your Cervélo bicycle will be equipped with clincher tires from the factory,

however many riders may wish to purchase a second set of wheels utilizing

tubular tires. If you install wheels with tubular tires on your bicycle, it is

very important that you obtain and read all safety information about

tubulars from the wheel & tire manufacturers, in particular the information

on the proper technique for gluing the tires to the rim. Improperly glued

tubular tires can separate from the rim causing a serious crash. It is up to

the rider to take responsibility for ensuring their tubular wheels and tires

are safe to use.

WARNING: Improperly installed tubular tires can separate

from the rims during a ride, possibly causing a serious crash

that may result in injury or death.

Schraeder valvePresta valve

turn

locknut

fig. 12

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Cervelo Multi-speed racing bicycles Seite 27

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