How to Lower a Schwinn Cruiser
- 1). Locate the quick release lever at the base of the seat near the bike frame.
- 2). Pull the release lever out to unlock the seat.
- 3). Twist the seat post down to the desired height. Ensure that the seat post is inserted far enough into the bike frame to prevent an unstable riding position and possible accident and or injury. There is a "minimum insertion" mark on the seat post. This mark should be inserted far enough into the frame to be hidden. If you can see this mark, the seat post isn't inserted far enough into frame.
- 4). Push the release lever back to the locked position to ensure the seat doesn't move.
Source...