105 DI2, FULLY CARBON, STUNNING DETAILS Since 1989, Polygon has proven to provide exceptional bikes at a fraction of the cost in relation to its competitors; the Helios A7X is no exception. The A7X boasts the new electronic Shimano 105 Di2 12-speed groupset , which has 10% more pad clearance (reduces disc brake rub) and a refined interface (cleaner cockpit aesthetic) and ergonomics. In addition to this, you get 50mm carbon wheels, lightweight UCI approved carbon frame , BLKTEC R8 integrated bar/stem , and a stunning chameleon purple frame . With the A7X, you get the complete package, without the price tag. Ride more for less.