Full Speed Ahead 8420ST Power Drive Bottom Bracket – English 73x113mm Full Speed Ahead 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

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