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6.4.9.4 Changing the handbrake inclination
angle
The nerves that pass through the carpal tunnel
are connected to the thumb and the index and
middle fingers. An excessively steep or
excessively flat brake angle will cause the wrist to
bend, thus narrowing the carpal tunnel. This can
cause numbness and tingling in the thumb and
index and middle fingers.
1 Calculate the difference between the height of
the handlebars and the saddle height to
determine the saddle-handlebar height
difference.
Figure 113: Example of 4 different handlebar heights (A,
B, C and D) and the saddle height (E)
Calculation
–
A
E
–
B
E
–
C
E
–
D
E
Table 107: Examples of saddle-handlebar height
difference
Adjust the angle of the handbrake so that it forms
a natural extension of the forearm.
MY23Z12 - 12_1.0_26.01.2024
A
B
E
C
D
Saddle-handlebar height
difference [mm]
>10
0... +10
0... -10
< -10
2 Set the brake lever angle as indicated in the
table.
Saddle-handlebar height
difference (mm)
>10
0... 10
0... -10
< -10
Figure 114: Brake angle
6.4.9.5 Determining the grip distance
1 Measure hand size using the grip distance
gauge.
2 Adjust the grip distance at the pressure point
based on the hand size.
Figure 115: Handbrake positioning
Hand size
S
M
L
Operation
20 – 25°
> 10 cm
25 – 30°
0 – 10 cm
E
30 – 35°
0 – 10 cm
35 – 45°
> 10 cm
Brake angle
20°...25°
25°...30°
30°...35°
35°...45°
Grip distance (cm)
2
3
4
107
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