How to Determine Bottom Bracket Standards
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 BBR-60 |
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 BB71 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 | 37mm | 90.5mm – 95.5mm | |
| Wilier BB94 | BB93 | 37mm | 93mm |
| Truvativ ISIS Overdrive | M48 x 1.5 Threaded | 68mm – 100mm | |
| Italian | 36mm X 24tpi | 70mm |