To solve a problem that a disc brake capable of obtaining strong braking force receives strong braking force on a disc brake mount, and with the disc brake mount post-attached to a frame by welding or the like only used for a conventional canti-lever system, strong braking force acts on the frame in a bending direction, the frame may be damaged, the disc brake mount part is deformed, and designed braking force cannot be exhibited.
In the bicycle for performing braking using the disc brake, the disc brake mount portion 1a for mounting a disc brake calliper 2 by a fastening part and a wheel shaft support member 1 for supporting a shaft of a rear wheel are constituted by the same structure, being constituted by a support member 1 of the wheel shaft such that an angle of a linear line contacting a central position of the disc brake calliper and an effective circle of a disc brake rotor is approximately coincident with an angle of a seat stay.
WAKAYAMA HIDEFUMI
YASUDA TOSHIYUKI
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