Page 107 - TBIS_15194-2019_(EN)_3nd
P. 107
TBIS 15194:2019
Dimensions in millimetres
1 Bottom-bracket axle centre
2 Chain-wheel or front pulley
Figure 46 — Chain and drive belt protective device requirements (minimum)
4.3.14.4 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 47).
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 47).
It is recommended that the gap between front-gear and front gear-change guide
specified by the manufacturer is properly set.
Dimensions in millimetres
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