Cannondale's best XC hardtail just got better. If going really, really fast on dirt in lycra is your cup o' tea, nothing lets you top 'em on the climbs and drop 'em on the descents like this 2019 Cannondale F-Si Hi-MOD World Cup. The World Cup edition features Cannondale's Hi-MOD BallisTec Carbon frame with stiffness-enhancing Si offset.