BB Cup Maxhit BSA Slv - 69mm Maxhit BSA 29/30 Carbon Bottom Bracket Center SleeveBB Cup Maxhit BSA Slv Maxhit BSA 29 30 Carbon Bottom Bracket Center Sleeve This carbon center sleeve is 69mm wide and will accomodate both 68mm & 73mm bottom bracket shell widths. This super thin and rigid carbon center sleeve is designed specifically for BSA 29 DUB and BSA 30 BBs that do not provide enough clearance between the cup and the spindle to accommodate a thicker material. It works with both Maxhit and our BSA 29 & 30 alloy cup BBs.