FSA (FSA Speed Ahead) 8420ST Power Drive Bottom Bracket - English 73x118mm FSA Power Drive Spindle Silver. Replacement bottom bracket for FSAs Power Drive splined cranksets. The stiff forged hollow chromoly spindle is supported by a pair of sealed industrial cartridge bearings. Additional weather protection comes from double “Snap” seals.

Forged hollow SCM4130 chromo spindle

Industrial 6002KRS cartridge sealed bearings with oversized 3/16” diameter balls

Cold forged aluminium cups

Double “snap” seals for water and dirt protection