exercise apparatus having locking means for facilitating adjustable positioning of a portion thereof . the exercise apparatus may take the form of an exercise bicycle or other equipment . the locking means are adapted to have a component positioned within a tubular member of the exercise apparatus and receive an adjustable member passing therethrough . the locking means components are adapted to be moved in a path generally transverse to the axis of the adjustable member and are adapted to provide compressive locking action to the adjustable member in the desired position .