Cannondale has always placed a lot of development emphasis and brand awareness on its racing efforts, and the F-Si is an addictively rapid and distinctive ride.
The head tube is very short but uses a 1.5in diameter bearing top and bottom to cope with the twin-crown design of the Lefty fork. Gear cables and brake lines are kept external for easier servicing and lower weight, due to the lack of outer cable sheath.
The front mech is direct mount, which will leave a stub if you single-ring it, and there’s no routing for side swing front derailleurs. In addition, there’s no direct mount for the rear mech. The direct-fit rear brake has to use an adapter to work with the 160mm rotor, which defeats the object of the simplified, lighter mount.
This does leave the flex-reducing ‘SAVE’ seatstays free from brake loads, though, and their broad stance at the subtly curved seat tube and wide PF BB gives the F-Si massive amounts of mud room.
The skinny 27.2mm seatpost adds flex into the ride but rules out most dropper post options, while the rear dropout is 135x9mm QR only.
Cannondale F-Si Alloy 1 kit
Cannondale F-Si Alloy 1 ride
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