F-Si has always been about pushing the limits of what an XC hardtail is capable of, and the new version pushes it harder and further than ever. No other hardtail descends as fast, climbs as nimbly, or kicks harder, smoother. With the otherworldly performance of the new Lefty Ocho, you’ve got a whole-new level of XC capability, tailor-made to feed the needs of the XC obsessed.
Lighten Up:
Light weight. Not a lightweight.
At just 900 grams (size Med, with all paint and hardware), the all-new F-Si is the lightest mountain bike frame Cannondale has ever made. It shaves 80 grams off the previous F-Si, and when you factor in the svelte new Lefty Ocho, you save a whopping 330 grams on the frame and fork (that's around 3/4 of a pound for you imperial folks). Pretty impressive.
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, not saving the weight of a few sips of water. Lighten up right, with the all-new F-Si.
Lefty Ocho OutFront:
The all-new 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?
BallisTec Carbon:
Our proprietary BallisTec carbon lets us push boundaries and tune rigidity throughout the entire frame – for stiffness where you need it and compliance where you don’t. At just 900 grams (size M, with all paint and hardware) it's one of the lightest hardtails in the world, yet so durable we back it with a lifetime warranty.
SAVE Micro-Suspension:
SAVE Micro-Suspension tunes the overall compliance of the frame. The rear triangle flexes vertically for shock absorption. Directionally optimized carbon layup in the seat tube allows controlled fore/aft bowing, for better traction, higher speeds and drastically minimized fatigue, whether seated or standing. Go faster longer.
For seated comfort, designing the F-Si with a 27.2mm seat post was just the start. Our collarless seat post clamp takes it even further, lowering the clamping point so that more of the post can flex. Put the power down all day long, without the punishment. A faster kind of thru-axle. Slotted dropout design lets the axle stay in the hub
Hidden Seatpost Collar:
For seated comfort, designing the F-Si with a 27.2mm seat post was just the start. Our collarless seat post clamp takes it even further, lowering the clamping point so that more of the post can flex. Put the power down all day long, without the punishment.
Speed Release Thru-Axle:
A faster kind of thru-axle. Slotted dropout design lets the axle stay in the hub for quicker, easier wheel changes. Compatible with standard 148x12 hubs. It’s a better way thru.
Other Technologies:
- Flat Mount Brakes
- Industry Standard Tapered Headtube
- Interchangeable Routing Chips
Video:
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