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  1. #1
    Ride for Life wearyourtruth's Avatar
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    external BB spacer question

    i bought an FSA crankset this weekend at a swap meet that uses the Mega eXo external BB. i've never installed one myself, though i have plenty of experience with other BB's. i looked on park's website and the process seems as simple as anything else, i just need to buy the wrench for the cups. (my BB has already been faced from prior BB installation).

    my question is about the spacers. my BB is 68mm, and the options they offer use 2 or 3 spacers in different arrangements, depending on the derailleur used. i am using a single speed setup with a cassette rear hub, so i can space the rear cog wherever i need it to be, i'm not worried about chainline, but the crankset/BB i bought only came with one spacer. if i only use this one, will it be enough to put the BB cups far enough apart to install the cranks correctly? my fear is that without enough spacers, the axle will stick too far out the non-drive side. should i hunt down another spacer or two? thanks!
    before posting, a "noob" should always ask themselves "could this have been answered by first visiting Sheldon Brown

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  2. #2
    Ride for Life wearyourtruth's Avatar
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    i'd still be curious for an answer, just for my knowledge, but i got a couple spacers from a buddy, so i'm good to go.
    before posting, a "noob" should always ask themselves "could this have been answered by first visiting Sheldon Brown

    -Tim-
    www.velocipedebikeproject.org

  3. #3
    <>< SoonerBent's Avatar
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    Since you don't have chain line issues I would just make sure the BB is spaced so that the crank arms are an equal distance away from the seat tube.

  4. #4
    motovation frankenmike's Avatar
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    It is crucial that the correct amount of spacers go between the external bb cups and the bb shell. As you said, otherwise the axle will stick out too far to one side.

  5. #5
    Senior member Dan Burkhart's Avatar
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    Quote Originally Posted by wearyourtruth View Post
    i bought an FSA crankset this weekend at a swap meet that uses the Mega eXo external BB. i've never installed one myself, though i have plenty of experience with other BB's. i looked on park's website and the process seems as simple as anything else, i just need to buy the wrench for the cups. (my BB has already been faced from prior BB installation).

    my question is about the spacers. my BB is 68mm, and the options they offer use 2 or 3 spacers in different arrangements, depending on the derailleur used. i am using a single speed setup with a cassette rear hub, so i can space the rear cog wherever i need it to be, i'm not worried about chainline, but the crankset/BB i bought only came with one spacer. if i only use this one, will it be enough to put the BB cups far enough apart to install the cranks correctly? my fear is that without enough spacers, the axle will stick too far out the non-drive side. should i hunt down another spacer or two? thanks!
    I think it goes like this. 73mm shell with E type derailleur, no spacers, 73mm with regular derailleur, one spacer drive side. 68mm with E type, one spacer each side, 68mm with regular derailleur, one spacer non drive side, 2 spacers drive side.

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