Bottom bracket - bike-vintage.com

Bottom Bracket Thread Name	Nominal Thread Description	Cup Outside Diameter	Shell width	Shell Inside Diameter
ISO/English or BSA	1.37 in x 24 TPI	34.6-34.9 mm Left-hand thread drive side	68 mm (73 mm Oversize)(83 mm Some Downhill & FR bikes)	33.6-33.9 mm
Italian	36 mm x 24 TPI	35.6-35.9 mm Right-hand thread both sides	70 mm	34.6-34.9 mm
French (obsolete)	35 mm x 1 mm	34.6-34.9 mm Right-hand thread both sides	68	33.6-33.9 mm
Swiss (very rare)	35 mm x 1 mm	34.6-34.9 mm Left-hand thread drive side	68	33.6-33.9 mm
Chater-Lea (very rare)	1.450 in x 26 TPI	oversized Left-hand thread drive side
Whitworth (obsolete, found on older English 3 speeds)	1-3/8 in x 26 TPI	34.6-34.9 mm Left-hand thread drive side	71/76	33.6-33.9 mm
O.P.C. Ashtabula	Male threads on crank 24 tpi (most) 28 tpi (Schwinn, Mongoose)		68 mm (2.68 in) wide	51.3 mm (2.02 in) (approximate)
O.P.C. Fauber	Male threads on crank		68 mm (2.68 in) wide	45 mm (1.77 in)
Raleigh	1 3/8 in x 26 tpi	34.6-34.9 mm Left-hand thread drive side		33.6-33.9 mm