Modern Cannondale bikes feature the bicycle's serial number on the underside of the frame, most often it is on the underside of the bottom bracket shell (in between the pedals).
The bicycle's serial number is on a barcode sticker and should look exactly like below:
- 2 letters + 5 numbers = 7 characters total
- A barcode (with vertical lines only), not a QR code
You may see other stickers on the downtube with numbers in different formats or QR codes. None of those are the serial number.
Serial Number barcode sticker (in red)
Location of the bar-coded serial number sticker
Vintage and older Cannondale bikes may have serial numbers placed on other areas of the bike. For a list of other locations, please click the link below.