F-SI BUILT FOR XCHARDTAIL + LEFTY OCHO
Ultra-light, super-efficient race machines designed to dominate the technical climbs and scary descents of the Word Cup.
No other hardtail descends as fast, climbs as nimbly, or kicks as hard. With the otherworldly performance of the LEFTY OCHO, this is next-level cross-country performance, tailor-made to feed the needs of the XC obsessed.
Light weight. Not a lightweight.
At just 900 grams (size Med, with all paint and hardware), the F-Si is the lightest mountain bike frame Cannondale has ever made. What’s even more impressive is that, rather than chasing marketing grams, our engineers focused on features that deliver real performance benefits out on the course.
Features like Ai and OutFront, or improved compliance, or improved durability.
That’s what wins races. Lighten up right, with the F-Si.
Lefty Ocho OutFront
The LEFTY OCHO is the smoothest, stiffest ultra-light XC fork ever made. It floats through chop and steers through the choss like nothing else.
Silky smooth and unfazed no matter how hard you push it. Happy to get in as deep as you dare. Its extra-long fork offset pairs up with the F-Si’s new, slacker 69° head angle to create OutFront geometry, giving you extra stability to charge the downs, with full XC agility on the ups. Helping the F-Si track perfectly through whatever you throw it into.
Ai Party in the Back
Short chainstays do wonders for traction and nimble handling, but they usually come at a cost. Ya gotta give something to get something. Not so with Ai.
Ai is our proprietary Asymmetric Integration drivetrain offset. By moving the gears and rear triangle over, we create space (double what you get from Boost) that enables us to shorten the stays and still have clearance for big tires and room for 2x drivetrains if you want. It even creates a stiffer, stronger rear wheel by evening out the dish. Smart, right?