FSA Full Speed Ahead SLK Light CrankBottom Bracket Sets use the same pressurized molding process as KForce Light. The arms are Hollow Carbon with an internal Ibeam reinforcement that yields higher torsional strength and stiffness than other FSA cranksets. Counter sunk cromoly bottom bracket spindle Monocoque unidirectional carbon fiber crankset with hollow arms Separately purchased bottom bracket allows use in BB90 or PressFit BB86 frames AL7075, CNCmachined S
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