EVOLUTION GOLD WING Y31LIGHTEST. STIFFEST. FASTEST. Built for riders who want every possible advantage lighter weight, faster response, higher performance. EVOLUTION GOLD WING Y31 takes the proven Evolution platform and pushes it to its material limits. A layer of 82 g m Aluula is placed at the critical stress points the central leading edge and strut junction delivering exceptional torsional stiffness and a more reactive, direct feel under power. A 70 g m Insignia stripe