The Rant Bang Ur BB kit includes 2 precision R12 sealed bearings, 2 CNC machined 6061 aluminum cone spacers for a clean look, an aluminum internal spacer, 4 steel crank arm spacers for dialing in your chain alignment.

– Size: American
– R12 Sealed bearings
– 100% CNC 6061-T6 alloy cones
– Include spacers for custom fit
– Weight: 5.5 oz.