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  1. #1
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    Determining a Straight Chainline

    I have a wheelset on the way for the fixed gear I'm building, and I may replace the BB and crankset on this bike as well.

    The BB's I'm looking at come in an array of sizes and I'm guessing it's possible to get one that would give me a perfectly straight or close-to chainline. How would I go about determining the right size BB?

    Thanks

  2. #2
    Curmudgeon Wil Davis's Avatar
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    Check Sheldon Brown's web-site, also Park Tools site. Both go into enough detail that you should have no problem finding a solution! Good luck!

    - Wil
    "" - Marcel Marceau

  3. #3
    Senior Member Spoonrobot's Avatar
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    A quality crankset will have a recommend or included bottom bracket.

  4. #4
    Veteran Bastard Scrodzilla's Avatar
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    Quote Originally Posted by Spoonrobot View Post
    A quality crankset will have a recommend or included bottom bracket.
    +1

    What crankset will you be using?

  5. #5
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    Well I'm hoping to use the crankset and BB that came on the bike, but I'm not sure how well it will line up, and I haven't counted the number of teeth on the gear. If it's not possible to use it then I was going to either scavenge around the bike co-op or find a cheap one online.

    I was just wondering if you could calculate how the rear cog and crankset gear would line up.

  6. #6
    Senior Member FakeFuji's Avatar
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    If you measure the distance from on side of the bb shell to the chainring then subtract 34 you will know the spacing of that, then do basically the same for the cog, and if your measurements are good youll have a general idea

  7. #7
    cheese connoisseur Mumonkan's Avatar
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    ride bikes, eat food. the circle of life.

  8. #8
    Senior Member Bat56's Avatar
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    Quote Originally Posted by Mumonkan View Post
    Holy **** that's amazing! How did you find that? Is that wonderful information really free?

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