Bedienungsanleitung Cervelo Multi-speed racing bicycles (Seite 22 von 40) (Englisch)

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Cervélo Owner’s Manual

make sure that you have maximum friction available, keep your

wheel rims and brake pads clean and free of dirt, lubricants, waxes or

polishes.

Brakes are designed to control your speed, not just to stop the bike.

Maximum braking force for each wheel occurs at the point just

before the wheel “locks up” (stops rotating) and starts to skid. Once

the tire skids, you actually lose most of your stopping force and all

directional control. You need to practice slowing and stopping

smoothly without locking up a wheel. The technique is called

progressive brake modulation. Instead of jerking the brake lever to

the position where you think you’ll generate appropriate braking

force, squeeze the lever, progressively increasing the braking force.

If you feel the wheel begin to lock up, release pressure just a little

to keep the wheel rotating just short of lockup. It’s important to

develop a feel for the amount of brake lever pressure required for

each wheel at different speeds and on different surfaces. To better

understand this, experiment a little by walking your bike and

applying different amounts of pressure to each brake lever, until

the wheel locks.

When you apply one or both brakes, the bike begins to slow, but

your body wants to continue at the speed at which it was going.

This causes a transfer of weight to the front wheel (or, under heavy

braking, around the front wheel hub, which could send you flying

over the handlebars).

A wheel with more weight on it will accept greater brake pressure

before lockup; a wheel with less weight will lock up with less brake

pressure. So, as you apply brakes and your weight is transferred

forward, you need to shift your body toward the rear of the bike, to

transfer weight back on to the rear wheel; and at the same time, you

need to both decrease rear braking and increase front braking force.

This is even more important on descents, because descents shift

weight forward.

Two keys to effective speed control and safe stopping are controlling

wheel lockup and weight transfer. Practice braking and weight transfer

techniques where there is no traffic or other hazards and distractions.

Everything changes when you ride on loose surfaces or in wet weather.

Tire adhesion is reduced, so the wheels have less cornering and braking

traction and can lock up with less brake force. Moisture or dirt on the

brake pads reduces their ability to grip. The way to maintain control

on loose or wet surfaces is to go more slowly to begin with.

D. Shifting Gears

Your multi-speed bicycle will have a derailleur drivetrain.

1. How a derailleur drivetrain works

The parts of the gear-changing mechanism include:

• a rear cassette or freewheel sprocket cluster

• a rear derailleur

• usually a front derailleur

• one or two shifters

• one, two or three front sprockets called chainrings

• a drive chain

a. Shifting Gears

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Cervelo Multi-speed racing bicycles Seite 22

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