The serial number is on a silver Burley barcode sticker and is a 15-digit alpha-numeric serial that begins with a single letter followed by the first three numbers of the model number.
Kid
Child Bike Seat
Underside of the seat.
Cycles
Stamped on the underside of the frame. It can be separated to be two lines of text.
Kid Bike Trailer and Strollers
Rear cargo area (behind the seat), lower left frame bar. For older trailers the sticker may on the lower-front frame bar, where the children’s feet would be.
Solstice Jogging Stroller
Inner left frame bar above the wheel.
Cargo
Coho XC and Flatbed
Underside of the trailer on the axle bar.
Nomad
Front left frame bar.
Travoy
Underside of the trailer on the axle bar.
Pet
Bark Ranger
Underside of the trailer on the axle bar.
Tail Wagon
Inside trailer on front left frame bar (2022-current trailers).
Front left frame bar. This is easiest to see when the trailer is collapsed since the side-panel fabric partially covers it (pre-2022 trailers).