Adjustable assembly for a bicycle

An adjustable assembly for a bicycle, comprising:

• a lower tubular support configured to be attached to a bicycle frame;
• an upper tubular support configured to be attached to a bicycle saddle, the upper tubular support longitudinally slidable relative to the lower tubular support;
• an expansion portion support member positioned within an interior space of the lower tubular support;
• an expansion portion disposed at an upper end of the expansion portion support member, wherein the expansion portion is configured to be moved between a radially expanded position and a radially contracted position, wherein an outer surface of the expansion portion is configured to engage an interior surface of the upper tubular support when the expansion portion is in the radially expanded position;
• a retention assembly movably connected to the expansion portion support member adjacent the expansion portion, the retention assembly configured to slidably move with respect to the expansion portion between a locked position and an unlocked position;
• wherein, when the retention assembly is in the locked position, the retention assembly engages an interior surface of the expansion portion to secure the expansion portion in the radially expanded position, thereby preventing longitudinal movement of the upper tubular support relative to the lower tubular support;
• wherein, when the retention assembly is in the unlocked position, the retention assembly is moved away from the interior surface of the expansion portion, thereby allowing the expansion portion to move to the radially contracted position and the upper tubular support to move longitudinally relative to the lower tubular support;
• a biasing member that biases the retention assembly into the locked position;
• a resilient member configured to provide an upwardly-directed force to the upper tubular support to provide movement of the upper tubular support away from the lower tubular support when the retention assembly is in the unlocked position;
• and
• an actuator operatively coupled to the retention assembly, the actuator being configured to selectively move the retention assembly between the locked position and the unlocked position.