Cannondale is normally a master of system integration. Unfortunately, you have to do without the legendary Lefty fork on the affordable version of their hardtail. It is only used on significantly more expensive bikes. All that remains of the system integration are the in-house Si cranks in the BB30 bottom bracket and the asymmetrical rear triangle. It ensures a more even spoke tension on the rear wheel and thus increases durability. Cannondale is one of the last manufacturers to dispense with a thru-axle on the 29-inch rear wheel and still uses a conventional quick release. This does not affect the stiffness of the frame.
Of all the marathon bikes tested here, the F-Si is the stiffest and therefore converts every watt that flows into the pedals into propulsion. However, relatively heavy wheels and the high overall weight slow down the propulsion. When seconds are at stake in the final sprint, the Cannondale F-Si has to let the competition go. On the other hand, the 2x11 drivetrain offers a wide range of gear ratios. If you're not just looking for marathon or cross-country racing, but also want to ride long tours in the Alps, you'll welcome this. The 100 millimetre stem and the offset seat post make the riding position sporty. Compared to the competition, the riding position is more stretched out. On the other hand, the 6.26 millimetre flex of the seatpost provides a noticeable touch of comfort. On descents, the low-profile Racing Ralph tyres struggle, and the combination of long stem and narrow handlebars makes for somewhat indirect handling. The open cable routing on the bottom bracket is susceptible to dirt. Closed systems work better.
Peter Nilges, BIKE Test Manager: The Cannondale F-Si can't keep up with the charm of the top model in the affordable € 2000 version. Heavy wheels and a somewhat outdated cockpit curb the euphoria of off-road riding.
off-road. With a little tuning, the potential of the carbon frame could be better utilised.
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