Road riders with FSA 19 mm MegaExo cranks in a threaded 68 mm frame who need a fresh, reliable bottom bracket.
The FSA BB-4000 is FSA's go-to threaded bottom bracket for road bikes with a BSA (English) 68 mm shell. It uses external cartridge bearings in CNC-machined cups, joined by a composite centre sleeve with double o-ring seals to keep water and grit out of the bearings.
It is built for FSA cranks with the 19 mm MegaExo spindle, the kind fitted to a lot of FSA Omega and Gossamer road chainsets. When your bottom bracket starts to creak, feel gritty or develop play, swapping in a fresh BB-4000 is usually the fix.
BSA 68 mm
Threads into standard English road frames.
19 mm MegaExo
Matches FSA Omega and other 19 mm MegaExo cranks.
Sealed sleeve
Composite sleeve with double o-rings keeps muck out.
Machined cups
CNC-machined external cups.
Bottom bracket
Barcode
MegaExo
FSA's external-bearing system. The bearings sit outside the frame shell, allowing a stiff, large-diameter hollow spindle and a wider bearing stance.
Great for
Maybe not for
Needs a BSA / English threaded shell (1.37 x 24 TPI) 68 mm wide and an FSA crank with a 19 mm MegaExo spindle. Measure your shell and check your crank's spindle before ordering; 24 mm spindles will not fit.
Installation
Clean and grease the frame threads (or use a threadlocker if the frame is prone to creaking), then fit the drive-side cup, which is reverse threaded, before the non-drive side. You'll need an external-cup bottom bracket tool that suits the cup splines.
Creaks after fitting?
Most creaks come from dry threads, a crank preload that is too loose, or dirty chainring bolts rather than the bearings. If yours keeps ticking, drop in and we'll work through it with you.
Full Speed Ahead components.
FSA, short for Full Speed Ahead, makes cranks, bottom brackets, headsets, cockpits and wheels that are fitted to a huge number of road and mountain bikes as original equipment.
