Cannondale CAAD8 Tiagra 6
The Cannondale CAAD8 Tiagra 6 is the middle entry of the CAAD8 bicycle class. Its alloy construction makes it the lightest aluminum frame on this list. Through specialized design and hydroforming the Tiagra 6’s frame and fork have flex zones offering a more comfortable ride with less friction and drag, making the bicycle faster.
The innovations in the design don’t quite make up for the lesser drivetrain on this bicycle as it is only outfitted with a 10 speed Shimano Tiagra 4600, and comes with lesser Schwalbe Lugano tires. Aside from the design elements this frame shares with more expensive Cannondales, the Tiagra 6 doesn’t have the components or performance to keep up with the other frames on this list.