Complete guide to bottom bracket standards


Bottom Bracket
Standard
Also Known As Frame BB Sheel Inner Diameter Common Shell Width
BSA Threaded Standard Threaded
English Threaded
1.37 in x 24 TPI
33.6mm – 33.9mm
68mm (road)
73mm (Mountain)
83mm (Downhill)
100mm (Fat Bike)
TREK BB90 37mm 90.5mm
TREK BB95 37mm 95.5mm
BB86 / BB92 BB86
BB92
BB121
BB7241B
PF24
PF41
PF86
PF92
BB107/ PF107
BB121
PF121
BB132
41mm 86.5mm
90mm
86.5
91.5mm
104.5mm
107mm
121mm
132mm
BB30 Specialized Alloy OSBB 42mm 68mm
73mm
84.5
83mm
120mm
Specialized Alloy OSBB 42mm 68mm
84.5mm (Mountain)
Cannondale BB30A 42mm 73mm
83mm (Cannondale BB30A-83)
PF30 Press Fit-30 46mm 61mm (Specialized OSBB/FACT)
68mm (Road)
73mm (Mountain)
83mm (Downhills
100mm (Fat Bike)
BBRight Cervelo BBRight Connect 24×90
Cervelo BBRight Connect GXP
Cervelo BBRight Connect 30×86
Cervelo BBRight Connect 30×90
46mm 79mm
Specialized OSBB Carbon (Road) 46mm 61mm
Cannondale PF30A 46mm 73mm
83mm (Cannondale PF30A-83)
Cannondale Asymmetric Integration (Ai) 46mm 83mm
T47 Threadfit 30i M47 x 1 Threaded
approx. 46mm ID
68mm
73mm
83mm
100mm
386EVO* 46mm 86mm
392EVO* 46mm 92mm
Colnago ThreadFit 82.5 41mm 86.5mm
Look BB95 65mm 90mm
Wilier BB94 BB93 37mm 93mm
Truvativ ISIS Overdrive M48 x 1.5 Threaded 68mm – 100mm
Italian 36mm X 24tpi 70mm

Shop Now