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Finding the correct bottom bracket for your frame can be challenging. To accurately determine the bottom bracket standard in your frame, it is best that you remove your crankset, and any installed bottom bracket cups or bearings. Then measure both the inner diameter and width of your frame's bottom bracket shell.
The chart below lists most of the current bottom bracket standards found on today's frames. Once you determine your bottom bracket standard, you then need to Identify Your Crankset.
BB Standard |
Frame BB Shell |
Common Shell Width |
Frame BB |
Also Known As |
Notes |
Wheels Mfg Bottom Brackets |
BSA Threaded |
|
|
|
|
Most common threaded BB shell system.
|
|
TREK BB90 |
|
|
|
Trek direct-fit system. Bearings are pressed directly into frame. | ||
TREK BB95 |
|
|
|
Trek direct-fit system. Bearings are pressed directly into frame. | ||
BB86 / BB92 |
|
|
|
|
Designed to be used with 24mm spindle diameter cranks (Shimano HollowTech II), hence the PF24 designation. But, can also use GXP cranks in these. Some brands call this PF41, describing the frame shell diameter instead of the crank spindle diameter. Removable bottom bracket cups. |
|
BB30 |
|
|
|
|
6806 bearings are pressed directly into the frame. May use removable c-clips as bearing stops, or the bottom bracket shell may have molded or machined bearing stops. Symetrical shell |
|
BBRight (Direct Fit) |
|
|
|
Cervelo R5ca Frames only. BB shell is 11mm wider on the non-drive side. 6806 bearings are pressed directly into the frame. |
||
Specialized OSBB Alloy |
|
|
|
Same as BB30. 6806 bearings are pressed directly into the frame. |
||
Cannondale BB30a |
|
|
|
Asymetrical BB shell is +5mm wider on the non-drive side (BB30A). For the BB30A-83 frames, the BB shell is 5mm wider on the drive side and +10mm wider on the non-drive side. 6806 bearings are pressed directly into the frame. |
||
PF30 |
|
|
|
|
Removable bottom bracket cups. |
|
BBRight (Press Fit) |
|
|
|
Cervelo Frames except R5ca. Also used by 3T. Removable BB cups. BB shell is 11mm wider on the non-drive side. |
||
Specialized OSBB Carbon (Road) |
|
|
|
Specialized carbon road frames with 61mm wide shells for use with Specialized FACT cranks. Removable BB cups. |
||
Cannondale PF30a |
|
|
|
Asymetrical BB shell is +5mm wider on the non-drive side (PF30A). For the PF30A-83 frames, the BB shell is 5mm wider on the drive side and +10mm wider on the non-drive side. Removable BB cups. |
||
Cannondale Asymmetric Integration (Ai) |
|
|
|
Cannondale Asymmetric Integration (Ai) found on Scalpel-Si and F-Si System frames. BB shell is 83mm wide, but symetrical Removable BB cups. |
||
T47 |
|
|
|
|
Frame's bottom bracket shell is threaded with M47 x 1 threads.
|
|
386EVO* |
|
|
|
* Essentially a PF30 with 86.5mm wide shell. |
||
392EVO* |
|
|
|
* Essentially a PF30 with 92mm wide shell. |
||
Colnago ThreadFit82.5 |
|
|
|
* Colnago standard with a threaded BB shell. Aluminum cups are threaded into the frame that result in the BB86 standard (41mm ID x 86.5mm width). |
Wheels Mfg does not make the threaded cups for these frames. Visit excelsports.com for cups
|
|
Look BB95 |
|
|
|
Unique to Look frames. Requires bearings and hardware from Look |
|
|
Wilier BB94 |
|
|
|
|
Unique to Wilier. Bearings press directly into the frame. Similar to Trek BB90 |
|
Truvativ ISIS Overdrive |
|
|
|
Little used threaded BB shell standard. Usually found on Cyclops indoor bikes. *NOT COMPATIBLE WITH T47* |
|
|
Italian |
|
|
|
|
To accurately identify your frame's BB shell, always measure the ID and width. Or, have a professional bike mechanic do the work for you.
Finding the correct bottom bracket for your frame can be challenging. To accurately determine the bottom bracket standard in your frame, it is best that you remove your crankset, and any installed bottom bracket cups or bearings. Then measure both the inner diameter and width of your frame's bottom bracket shell.
The chart below lists most of the current bottom bracket standards found on today's frames. Once you determine your bottom bracket standard, you then need to Identify Your Crankset.
BB Standard |
Frame BB Shell |
Common Shell Width |
Frame BB |
Also Known As |
Notes |
Wheels Mfg Bottom Brackets |
BSA Threaded |
|
|
|
|
Most common threaded BB shell system.
|
|
TREK BB90 |
|
|
|
Trek direct-fit system. Bearings are pressed directly into frame. | ||
TREK BB95 |
|
|
|
Trek direct-fit system. Bearings are pressed directly into frame. | ||
BB86 / BB92 |
|
|
|
|
Designed to be used with 24mm spindle diameter cranks (Shimano HollowTech II), hence the PF24 designation. But, can also use GXP cranks in these. Some brands call this PF41, describing the frame shell diameter instead of the crank spindle diameter. Removable bottom bracket cups. |
|
BB30 |
|
|
|
|
6806 bearings are pressed directly into the frame. May use removable c-clips as bearing stops, or the bottom bracket shell may have molded or machined bearing stops. Symetrical shell |
|
BBRight (Direct Fit) |
|
|
|
Cervelo R5ca Frames only. BB shell is 11mm wider on the non-drive side. 6806 bearings are pressed directly into the frame. |
||
Specialized OSBB Alloy |
|
|
|
Same as BB30. 6806 bearings are pressed directly into the frame. |
||
Cannondale BB30a |
|
|
|
Asymetrical BB shell is +5mm wider on the non-drive side (BB30A). For the BB30A-83 frames, the BB shell is 5mm wider on the drive side and +10mm wider on the non-drive side. 6806 bearings are pressed directly into the frame. |
||
PF30 |
|
|
|
|
Removable bottom bracket cups. |
|
BBRight (Press Fit) |
|
|
|
Cervelo Frames except R5ca. Also used by 3T. Removable BB cups. BB shell is 11mm wider on the non-drive side. |
||
Specialized OSBB Carbon (Road) |
|
|
|
Specialized carbon road frames with 61mm wide shells for use with Specialized FACT cranks. Removable BB cups. |
||
Cannondale PF30a |
|
|
|
Asymetrical BB shell is +5mm wider on the non-drive side (PF30A). For the PF30A-83 frames, the BB shell is 5mm wider on the drive side and +10mm wider on the non-drive side. Removable BB cups. |
||
Cannondale Asymmetric Integration (Ai) |
|
|
|
Cannondale Asymmetric Integration (Ai) found on Scalpel-Si and F-Si System frames. BB shell is 83mm wide, but symetrical Removable BB cups. |
||
T47 |
|
|
|
|
Frame's bottom bracket shell is threaded with M47 x 1 threads.
|
|
386EVO* |
|
|
|
* Essentially a PF30 with 86.5mm wide shell. |
||
392EVO* |
|
|
|
* Essentially a PF30 with 92mm wide shell. |
||
Colnago ThreadFit82.5 |
|
|
|
* Colnago standard with a threaded BB shell. Aluminum cups are threaded into the frame that result in the BB86 standard (41mm ID x 86.5mm width). |
Wheels Mfg does not make the threaded cups for these frames. Visit excelsports.com for cups
|
|
Look BB95 |
|
|
|
Unique to Look frames. Requires bearings and hardware from Look |
|
|
Wilier BB94 |
|
|
|
|
Unique to Wilier. Bearings press directly into the frame. Similar to Trek BB90 |
|
Truvativ ISIS Overdrive |
|
|
|
Little used threaded BB shell standard. Usually found on Cyclops indoor bikes. *NOT COMPATIBLE WITH T47* |
|
|
Italian |
|
|
|
|
To accurately identify your frame's BB shell, always measure the ID and width. Or, have a professional bike mechanic do the work for you.