A mountain race bike loaded with performance features that ensure victory, all while weighing next to nothing. Key Benefits: Designed For the W. At just 900 grams, F-Si is the lightest mountain bike frame we’ve ever made. Better still, our engineers built in real compliance, real durability, & the handling & features that really win races. Next-Level Geometry F-Si attacks the steepest climbs & nastiest descents of modern World Cup XC courses. Ai offset drivetrain & Out Front steering geometry deliver an uncanny mix of stability, agility & traction. The Best XC Fork… Period Simply the most advanced, smoothest, most precise-handling ultralight XC fork ever made. Its one-of-a-kind design lets it float through the chop & steer through the choss like nothing else.