Frame
The bike serial number is typically located on the underside of the bike frame near the pedals or on the seat tube.
On the underside of the frame
When you release the cylinder from the frame,you should find the serial number at the base of the frame and on the crane at the swivel.
It should be on the metal frame
Check the frame and butt
On the frame and the grip frame.
The serial number is located on the bottom forward edge of the receiver frame (forward of the lever).
Check the frame and barrel
The specialized bike serial number is typically located on the underside of the bike frame near the bottom bracket.
No you'll need the frame serial number. it is located in the fron or below the motor on the frame. May be on a tag which indicates the year as well.
The Schwinn cruiser serial number is typically located on the bottom bracket of the bicycle frame.