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  1. #1
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    Bottom Bracket/Spindle issues for fixed gear build up

    I have an old Peugeot frame which I want to build up into a fixed gear. It came with a SWISS bottom bracket in good condition, but with a 126mm spindle. From reading around on sheldon brown's site and bike forums, it seems likely that chainline issues will surface with such a long spindle. I've never built up a bike before so I'm not sure exactly what this will entail (although I'm excited to find out ), and I also read that chainline issues tend to be something you can't over-anticipate, that they tend to be unique for individual set ups, and that you just have to try it out and see how things turns out.

    Assuming this spindle is too long for a fixed gear, it seems like people have a hard time finding swiss-threaded bottom brackets, and so I might be better off just trying to replace the spindle? When I talked to someone at the LBS about this, she said that the center part of the spindle is the important measurement to match up for BB/spindle compatibility. Is this true? Are there other considerations I need to pay attention to as well? Has anyone ever swapped out a spindle with a different sized one?

    Thanks!!

  2. #2
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by noahjz
    I have an old Peugeot frame which I want to build up into a fixed gear. It came with a SWISS bottom bracket in good condition, but with a 126mm spindle. From reading around on sheldon brown's site and bike forums, it seems likely that chainline issues will surface with such a long spindle. I've never built up a bike before so I'm not sure exactly what this will entail (although I'm excited to find out ), and I also read that chainline issues tend to be something you can't over-anticipate, that they tend to be unique for individual set ups, and that you just have to try it out and see how things turns out.

    Assuming this spindle is too long for a fixed gear, it seems like people have a hard time finding swiss-threaded bottom brackets, and so I might be better off just trying to replace the spindle? When I talked to someone at the LBS about this, she said that the center part of the spindle is the important measurement to match up for BB/spindle compatibility. Is this true?
    Yes. French bottom bracket cups often have fairly thin walls, so the ball ridges on the matching spindle are typically farther apart than you would find on an ISO/English BB even though they're both 68 mm shell width.

    Thus, you might want to use an Italian size (5**) spindle instead of a 3** spindle as would normally be used for a 68 mm shell.

    Another option might be to reverse the existing spindle, which is most likely longer on the right side.

    Quote Originally Posted by noahjz
    Are there other considerations I need to pay attention to as well? Has anyone ever swapped out a spindle with a different sized one?
    Sure, tens of thousands of people have done this. ;-)

    See: http://sheldonbrown.com/bbsize

    and: http://sheldonbrown.com/velos

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  3. #3
    Acetone Man
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    Dude, you're in Portland. Just go to Citybikes, they've got tons of spindles you can try out until you get finally get a good chainline. Community Cycling Center probably has a bunch too. I'm in sort of the same boat; I have to get a new spindle for my fix because my JIS crank finally came loose on the ISO spindle, and I'm not chancing ruining the cranks again. Thing is, even though my Peugeot has a 68 mm French bottom bracket, the cups are apparently so thin that the spindle (the original) is actually a _7_ series, which is even wider than the 5! Nice 5 series spindles are aplenty because they came on Italian bikes, but the only 7 series ones I have found are 127mm wide or wider. I don't think putting a 5 series spindle in as is would leave enough threads on the adjustable cup for the lockring to get a good grip, but I haven't tried it. Has anyone else had a French bike that came with a 7 series spindle, and what did you do about it? I could always buy one of those sugino bottom brackets with the thicker cups, but I'm hoping that isn't necessary.

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