F-Si Carbon 4

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The Future of XC

To create the fastest XC race rocket the world has ever seen, innovation is not an option, it's a necessity. Using our System Integration approach, every part of the new F-Si - from the asymmetrically offset rear triangle and drivetrain, to the new-school geometry and custom rake Lefty - was designed as a system, fully integrated in the pure pursuit of speed.

Rider profile:

For XC racers and hardtail purists looking to gain time on their rivals in ever y section of the course.

TECHNOLOGIES

  • ASYMMETRIC INTEGRATION (Ai) DRIVETRAIN
    Our Ai design shifts the drivetrain and rear triangle to the right by 6mm. This creates an ultra stiff rear wheel by reducing dish, and delivers the shortest chainstays on the market, dual chainring compatibility, tons of mud clearance, and a super responsive rear end.
  • STIFFER REAR WHEEL
    By keeping the rim and tire in line with the centerline of the bike, but shifting the hub and cogs 6mm to the right, we make the spoke angles more even on both sides, creating a stronger wheel that's up to 60% stiffer than a conventionally laced wheel, while using a standard rim and normal 135mm hub.
  • SHORTEST CHAINSTAYS
    The Ai system allows for the shortest chainstays on the market (429mm), which moves the rear wheel forward to be more under the rider, resulting in exceptional lateral stifness and racewinning traction.
  • Ai HOLLOWGRAM SPIDER
    The F-Si spider moves the chainrings out 6mm to match the rear triangle with no change in Q-factor. This enables the super short chainstays while providing ample mud clearance for the tire and maintaining double and single ring compatibility.
  • SYSTEM GEOMETRY
    Up front, the progressively slack 69.5° head angle gives the stability needed to attack on rough, fast descents, while the Lefty features increased fork offsets (55mm for 29 and 50mm for 27.5 ) to reduce “trail” and keep the steering quick and nimble in slower, tight, technical sections. In back, the super short chainstays make the bike extremely agile for technical manuverability and crazy traction.
  • BALLISTEC CARBON
    Our proprietary carbon construction method pairs ultra strong military armoring fibers with high strength resins and a tightly controlled network of high-modulus stiffening fibers to deliver ultra light frames with exceptional strength and ride-feel. Oh yeah, and lifetime warranties.
Frame

F-Si Asymmetric, BallisTec Carbon, SPEED SAVE, PF30A, 1.5 Si Head Tube, 27.5" (S), 29" (M-X)

Fork

Lefty 2.0, 100mm, PBR Isolated Damper Technology with XC+ tune and updated controls, Offset - 50mm (S), 55mm (M-X)

Crank

Cannondale Si, Ai, BB30, FSA 26/36 rings

Crank Option 1

N/A

Bottom Bracket

Cannondale Alloy PressFit30

Shifters

Shimano SLX w/ I-Spec

Cog Set

Shimano HG-50, 11-36, 10-speed

Chain

Shimano HG50, 10-speed

Front Derailleur

Shimano M618 Deore

Rear Derailleur

Shimano XT, Shadow Plus, 10-speed

Rims

Stan's ZTR Rapid, 32 hole, tubeless ready (Ai offset lacing)

Hubs

Lefty 60 front, Formula DC-22 rear (Ai offset lacing)

Tires

Schwalbe Racing Ralph Performance 29/27.5x2.1", tubeless ready

Pedals

N/A

Brakes

Shimano Deore, 180/160mm

Handlebar

Cannondale C3 flat, 6061 double-butted alloy, 700mm

Stem

Cannondale C3, 6061 Alloy, 1.5", 31.8, -5 deg.

Headset

Cannondale HeadShok Si

Brake Levers

Shimano Deore, I-Spec

Spokes

DT Swiss Competition (Ai offset lacing)

Grips

Cannondale Locking Grips

Saddle

Prologo K3

Seat Post

Cannondale C3, 6061 alloy, 27.2x350mm (S,M) 400mm (L,X)

Rear Shock

N/A