| 摘要 |
In a motorcycle, to prevent an increase in the diameter of a hub in association with the mounting of a pulser ring and for increasing the flexibility when arranging a wheel speed sensor. An annular groove is formed on a side surface of an annular rear brake disk in an annular shape. A stepped annular pulser ring is mounted to the side surface of the rear brake disk so that a pulser section is located in the groove. Thus, a space for accommodating the pulser ring on an inner periphery of the rear brake disk is eliminated. In addition, the size of a hub-engagement hole on the rear brake disk may be reduced. Since the pulser section of the pulser ring is located in the groove of the rear brake disk, it does not take much space in the direction of an axle.
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