Birzman Bottom Bracket Socket For BSA30/386

A double-sided B.B. Socket born out of the increasing popularity of 30mm crank spindles.
Made from CNC machined 7075 aluminium it's durable and provides very precise engagement with all the notches of the bottom bracket so won't chew up the bottom bracket.
Compatible with Rotor BSA 30, SRAM DUB BSA (axle 28.99mm), RaceFace Cinch, Zipp Vuma, Hawk Racing BB3086 or other 12-notch 46.5mm external bearing bottom bracket cups.
Compatible with FSA EVO 386 or other 16-notch 48.5mm external bearing bottom bracket cups.