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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

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