The most evident changes are immediately noticed on the first shift. The new design of the chain up shift & downshift zones makes shifting extremely fast & precise. The axle of Athena is the brand new Power Torque System, which makes it possible to obtain very high values of torsional stiffness & efficient power transmission, without increasing the lateral bulk. The crankset is also available in the carbon fibre version that is more than 100 grams lighter.