Bottom Brackets
Bottom Bracket Measuring Guide
Please use the guide bellow to help measure your Bottom Bracket. Please note that it is important to measure the width and inside diameter of your Bottom Bracket to confirm the correct size.
MTB / Standard Bike Bottom Brackets
68/73/83mm | 100mm | 120mm | BB86/BB92 | BB90/95 (trek only) | PF30 | BB30 | BB121 | BB Right Direct Fit (cervelo only) | BB Right Press Fit | 386 EVO | |
Type | BSA / English Threaded | BSA / English Threaded | BSA / English Threaded | Press fit | Press fit | Press fit | Press fit | Press fit | Press fit | Press fit | Press fit |
Frame shell width | 68/73/83mm | 100mm | 120mm | 86.5mm / 91.5mm | 90.5mm / 95.5mm | 68/73/83/100mm | 68/73mm | 121mm | 79mm | 79mm | 86.5mm |
Frame shell ID | 34.5mm | 34.5mm | 34.5mm | 41mm | 37mm | 46mm | 42mm | 41mm | 42mm | 46mm | 46mm |
CYC BB type choice | 68/73/83mm version | 100mm version | 120mm version | BB92 (if BB86 request for 3x2mm spacers) | Not compatible | According to shell width | 8/73/83mm version | For X1 Pro 4: select 120mm version For X1 Pro Gen 2 & Photon 2: Not compatible | Not compatible | 8/73/83mm version | BB92 + 3x2mm spacers |
Adaptor needed | N/A | N/A | N/A | For X1 Pro 4 & Photon 2: CYC BB92 to BSA adaptor already included For X1 Pro Gen 2: Not compatible | N/A | PF30 to BSA adaptor (example) | BB30 to BSA adaptor (example) | CYC BB92 to BSA adaptor (shop) | N/A | PF30 to BSA adaptor (example) | PF30 to BSA adaptor (example) |
BMX Bottom Brackets
American / Ashtabula | Spanish | Mid | Euro | |
Type | Press Fit | Press Fit | Press Fit | Threaded |
Spindle OD (irrelevant but someone might use this as reference) | 19mm | 19/22mm | ||
Width | 68mm | 68mm | 73mm | |
Frame ID | 51mm | 37mm | 41mm | 34.5mm |
CYC BB Type Choice | 68/73/83mm | 68/73/83mm | 68/73/83mm | 68/73/83mm |
Adaptor Needed | N/A |
Special Cases
BB92 / BB89 with step in BB shell
For X1 Pro 4 & Photon 2:
Compatible with the BB92 bottom bracket option. There is a chance that the CYC BB92 to BSA adaptor will be too wide to fit properly before the step in the BB shell (see blue line indication below) but if this is the case, then you can file off the excess width from the adaptor.
For X1 Pro Gen 2 kits:
Not compatible. We also do not advise using 100mm option due to chain-line issues.
Additional Information
Threads
The BSA standard uses 1.37 (34.8mm) x 24 threads per inch, with the non-drivetrain side of the bike threading counterclockwise while the drivetrain side tightens clockwise.