The Cannondale serial number, consisting of 2 letters and 5 digits, is located under the bottom bracket.
For EABs, it is located either behind the seat tube or under the down tube.
The Cannondale serial number, consisting of 2 letters and 5 digits, can be found either on the bottom bracket or on the chainstay.For VAE bikes, it's either behind the seat tube or under the down tube.For forks, the serial number is found behind the tee on Lefty Ocho bikes and behind the spindle on Lefty H2 bikes.
