The lightweight, agile F15X delivers pure performance for the unpredictable world of competitive cyclocross. This responsive, smooth-riding frame is engineered with a blend of 7005 Ultralite aluminum tubes plus a carbon fiber seatstay and fork. This year’s frame has been updated with a new BB30 bottom bracket, which improves pedaling stiffness and adds chainstay clearance to keep you rolling in the worst conditions.