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Carbon frame, BallisTec Carbon, SAVE, PF30-83, tapered head tube, rear axle 12x148 mm, Ai Offset. The Cannondale F-Si Carbon carbon frame is one of the lightest in its class, and thanks to the special layering of carbon fibers, it can boast traditionally excellent strength and stiffness. The geometry with a short rear structure, a more relaxed head angle and a large offset of the fork axis will guarantee that you won't be surprised by anything on the racing tracks. The key point of the entire frame is the rear construction with the so-called Ai asymmetric drive integration. Thanks to the displacement of the drive train by six millimeters to the right, the rear structure has been significantly shortened, and thus also a significant improvement in the bike's handling both on and off-road. At the same time, this solution made it possible to maintain sufficient patency for the use of wide tires. Shifting the drivetrain made it possible to create a more uniform rear string for even more stiffness when sprinting and cornering. The SAVE technology of the rear structure guarantees driving comfort even in broken terrain. Model: F-Si Model year: 2021 Designation: MTB Wheel diameter: 29" Technology: BallisTec Carbon, SAVE, Ai Material: BallisTec Carbon Head tube: Tapered Center: PF30-83 Brake attachment: FM Seat tube diameter: 27.2 mm Rear axle: 12x148 mm Heel: yes Internal management: yes Weight: 1250 g Package contents: Frame, foot, screw for fastening the seat post, set of blanks Max. shell width: 2.35"