The device is designed to guide a flexible linking member passing into a bicycle frame to link a control member carried by bicycle handlebars to a receiver. The linking member (14) enters the bicycle frame via an inlet opening (15) formed in a head tube (1). The guide device (3) forms an insert that can be built into the head tube (1) and includes a guide channel (17) for the linking member (14) intended to communicate with the inlet opening (15). The insert (3) can be placed inside the head tube (1) in a seat (4) shared with an upper bearing (2) of a headset and has an internal face that can at least partially surround a fork steerer (6) inserted in the head tube (1), and an external face containing the guide channel (17).