A set of external CNC machined bottom bracket cups with replaceable stainless steel cartridge bearings. Maybe the most reliable BB out there.
If you're after a bombproof bottom bracket with super long life and replaceable cartridge bearings, look no further. The Hopetech Stainless Bottom Bracket is an excellent aftermarket upgrade; it's available in the usual 6 colours and compatible with most cranks (see below).
24mm Option: Compatible with most Shimano Hollowtech cranks, SRAM and GXP cranks (with additional adapter - available separately).
30mm Option: Compatible with Hopetech cranks, race face SIXC cranks.
This is a special order item and is usually available in 3-5 working days.