Fsa gamma drive alloy mexo m 10 cranksetgamma drive offers high end performance at a mid range price 7050 aluminium is used for the solid forged crank arms and bottom bracket spindle available in either bb30 or megaexo variants chainrings are stamped from durable 7075 aluminium and are fully equipped with ramps and pins for fast quiet shifts the solid arms are machined at the back to save some weight without compromising stiffness with deep arms giving maximum power transfer features sol