Abstract: The invention provides a saddle support for use on a bicycle frame having a tubular upright with an exposed open upper end to receive the support. A tubular post is proportioned to slidably engage in the tubular upright and a clamp is coupled to a first end of the post for engagement inside the upright. The clamp includes an actuator inside the post for operation to releasably clamp the post in the upright and a saddle coupling is attached to the other end of the post. The coupling includes a base attached to the post and a top coupled to the base and adapted to be attached to a saddle. The top is moveable between a closed position where the top bars access into the post, and an open position where the top permits access into the post for a tool to operate the clamp. A lock is coupled to both the base and to the top to retain the top in the closed position to prevent unauthorized access into the post to release the clamp. The lock is operable to release the top for movement into the open position.