Bedienungsanleitung Kalkhoff 2021 (Seite 31 von 70) (Englisch)

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Originalbetriebsanleitung Allgemein EN-31

21.1 Checking the bearing play

Proceed as follows to check whether the headset is too

loose:

1. Grip the upper ball socket with your thumb and

forenger.

2. Actuate the front brake with your left hand and move

the bicycle gently forwards and backwards.

3. If the headset is too loose, there will be signicant

jerking on the upper ball socket.

4. If you feel jerking in the upper ball socket, the bearing

play must be reduced.

A headset that is too tight will be sti:

1. Lift the bicycle by its frame so that the front wheel is

o the ground.

2. If the handlebars only move sluggishly and unequally

from one side to the other, the bearing play must be

increased.

21.2 Adjusting a screw headset

1. Loosen the lock nut by turning this counterclockwise

using a wrench.

2. To reduce the bearing play, turn the upper ball socket

clockwise using a wrench. To increase the bearing

play, turn the upper ball socket counterclockwise

using a wrench.

3. Hold the upper ball socket with a wrench so that the

bearing play does not change again.

4. Now, tighten the lock nut again by turning this

clockwise using a wrench  13. Tightening torques for

threaded connections Page EN-19.

5. Check the bearing play again  21.1 Checking the

bearing play Page EN-31 and adjust as required.

21.3 Adjusting Ahead headsets

21.3.1 Ahead headset I

To adjust the bearing play on this type of headset, the front

stem must be readjusted. You should therefore contact your

specialist workshop for this adjustment work.

1. Loosen the clamping screws counterclockwise.

2. Turn the adjustment screw clockwise to reduce the

bearing play.

3. Once the bearing play is set correctly, centre and

secure the front stem by tightening the clamping

screws clockwise to the specied tightening torque

using a torque wrench  13. Tightening torques for

threaded connections Page EN-19.

21.3.2 Ahead headset II

To adjust the bearing play for this type of headset, there is

no need to readjust the front stem, which means that you

can perform this adjustment yourself, if you think you can.

Reducing the bearing play:

1. To reduce the bearing play, turn the adjustment screw

clockwise. The plastic tab in the setting window will

move to the left.

2. If the bearing play is still too high and the plastic tab

has already reached the end of the setting window,

turn the adjustment screw counterclockwise until the

plastic tab once again reaches the start of the setting

window.

3. Loosen the clamping screw on the clamping ring by

turning it counterclockwise a few turns.

4. Then, push the clamping ring towards the head tube.

Align the clamping and threaded rings on the front

stem.

5. Tighten the clamping screw clockwise to the specied

tightening torque using a torque wrench.

6. Turn the adjustment screw clockwise until the desired

bearing play is reached.

7. The clamping ring should t ush beneath the front

stem. If the front stem must be readjusted in order to

achieve this, please contact your specialist workshop

about this.

Increasing bearing play:

1. To increase the bearing play, turn the adjustment

screw counterclockwise. The plastic tab will move to

the right at the same time.

22. Bicycle fork

The front wheel is held in place by the

bicycle fork. The bicycle fork consists of

two fork blades, a fork bridge and a fork

steerer tube. If you own a carbon fork, be

sure to read  6.3 Carbon: general safety

information Page EN-13. The majority of

bicycles are tted with suspension forks.

Suspension forks are often adjustable, and

oer greater riding comfort.

Fig. 38

Suspension fork

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