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  1. #1
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    BSA30 and FSA Compatability

    I have a FSA SL-K BB30 crankset and just picked up a 2016 Kona Big Unit which has a BSA bottom bracket. I know a bunch of manufacturers make a BSA30 cup set to handle the 30mm spindle but which ones actually fit? Race Face make some, as do Hope, Enduro etc. Anyone have knowledge/experience with this?

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  2. #2
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    The BB will fit the bike but won't likely fit the crank. Cranks used on BSA30 need a long spindle. The BB shell on a BSA frame is already as wide as a BB30, plus then you add the bearing cups.

  3. #3
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    Quote Originally Posted by Slash5 View Post
    The BB will fit the bike but won't likely fit the crank. Cranks used on BSA30 need a long spindle. The BB shell on a BSA frame is already as wide as a BB30, plus then you add the bearing cups.
    Lolol not even close. Bsa30 is a special bsa cup to run 30mm spindles in standard threaded bb shells. Bb30 is the same thing as a regular bsa bb as far as q factor and spindle lengths the only difference is that they're press fit into the frame

  4. #4
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    Quote Originally Posted by 612 View Post
    Lolol not even close. Bsa30 is a special bsa cup to run 30mm spindles in standard threaded bb shells. Bb30 is the same thing as a regular bsa bb as far as q factor and spindle lengths the only difference is that they're press fit into the frame
    What part is not correct? A BSA30 can be installed on the bike if it has BSA now and he can't use the crank he is proposing.
    A normal BB30 is only 68 or 73 mm wide. The cranks that use this interface have a short spindle. A BSA30 BB is 98 mm wide (RaceFace Cinch) so the spindle of the crank must be much longer.

  5. #5
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    Bb30 utilizes the same cranks as bsa 30 but bsa is a thread external bearing and bb30 is a pressed in bearing.

  6. #6
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    From the Enduro site:
    Fits standard "BSA" threaded bottom bracket shells using Left and Right cups. Not all BB30 cranks are compatible due to varying spindle lengths. Some of the cranksets known to be compatible include:

    e13 Mountain Cranks
    Race Face Next SL cranks
    Rotor 3D+ cranks
    Zipp VumaQuad cranks
    Lightning cranks

    From VeloNews:
    Finally, Iím sure you could not use Rotorís BSA30 cups on other BB30 cranks because there would not be enough space between the frame and the crankarms for the external cups. A BB30 road bottom bracket shell is 68mm wide Ė the same as a BSA (English-threaded) road bottom bracket shell (both systems are 73mm wide for mountain bikes). And one of the much-hyped features of most BB30 cranks is the fact that ankle clearance is improved. In other words, most BB30 crank manufacturers have taken advantage of the fact that there is not an external bottom bracket cup taking up space and have moved the head of the crankarm inward on both sides. So you couldnít fit the BSA30 cups in between the frame and the cranks with any crank other than Rotor. And that doesnít even address the fact that, even if you could fit them in, the raised and ground bearing-contact surfaces on either end of most BB30 spindles would not line up with the external bearings, since they are placed to contact the inner races of bearings that are internal to a 68mm (or 73mm mountain) bottom bracket shell.

  7. #7
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    Quote Originally Posted by Slash5 View Post
    From the Enduro site:
    Fits standard "BSA" threaded bottom bracket shells using Left and Right cups. Not all BB30 cranks are compatible due to varying spindle lengths. Some of the cranksets known to be compatible include:

    e13 Mountain Cranks
    Race Face Next SL cranks
    Rotor 3D+ cranks
    Zipp VumaQuad cranks
    Lightning cranks

    From VeloNews:
    Finally, Iím sure you could not use Rotorís BSA30 cups on other BB30 cranks because there would not be enough space between the frame and the crankarms for the external cups. A BB30 road bottom bracket shell is 68mm wide Ė the same as a BSA (English-threaded) road bottom bracket shell (both systems are 73mm wide for mountain bikes). And one of the much-hyped features of most BB30 cranks is the fact that ankle clearance is improved. In other words, most BB30 crank manufacturers have taken advantage of the fact that there is not an external bottom bracket cup taking up space and have moved the head of the crankarm inward on both sides. So you couldnít fit the BSA30 cups in between the frame and the cranks with any crank other than Rotor. And that doesnít even address the fact that, even if you could fit them in, the raised and ground bearing-contact surfaces on either end of most BB30 spindles would not line up with the external bearings, since they are placed to contact the inner races of bearings that are internal to a 68mm (or 73mm mountain) bottom bracket shell.
    Well sh!t. I was taught that they kept the bearings in the same place relative to the rider as to not change the q factor but just move them inside the frame to increase design flexibility and bb stiffness. Has anyone tested an FSA bb30 crank yet?

  8. #8
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    They are most definitely outboard of the shell.

    6806 (BB30) bearings themselves are, in fact, larger than a traditional BSA-threaded shell's inner diameter.

    BSA30 units use 6806 bearings housed in an oversized version of your "standard" outboard bottom bracket. So, 68/73mm + the width of the bearing housing (10-12mm each side, I'd guess).

    As opposed to BB30, which are just 68/73mm.
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