Page 34 - 2018-v.3-Part 2(EN)
P. 34
Dimensions in millimetres
Key
1 bottom-bracket axle centre
2 chain wheel or front pulley
B tip circle of the pulley
C tip line of the belt
Figure 8 — Chain and drive belt protective device requirements (minimum)
4.15.4 Combined front gear-change guide
When the chain is located in the outer gear position, some portion of the combined front gear change
guide shall be above the chain in the region 25 mm from the point where the chain wheel first passes
between the side plates of the chain, parallel to the chain side plates in the direction towards the rear
wheel of the bicycle (see Figure 9).
In addition, some portion of the combined front gear change guide shall be present below the chain in
the region beyond 25 mm from the point where the chain wheel first passes between the side plates
of the chain, parallel to the chain side plates in the direction towards the rear wheel of the bicycle (see
Figure 9).
NOTE It is recommended that the gap between front-gear and front gear-change guide specified by the
manufacturer is properly set.
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