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  1. #1
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    cog tooth count interchangeability

    unsure how to word the topic.... but my question is..

    how much distance in the dropouts does the rear axle move when adding or subtracting a tooth?

    a ratio would be nice... somethin like 2 teeth : 1 cm

    anyone know ?

  2. #2
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    One tooth equals about 1/8" change in the dropouts. Don't take my word for this just yet. Others will confirm or correct.

    edit: After checking my dropouts paint scrapes I can say confidently that going from 15 to 17 moved my axle about 1/8"
    Last edited by twelsch42; 06-08-09 at 09:42 AM.

  3. #3
    Senior Member Aries's Avatar
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    Id say your ratio is roughly accurate, OP. I switched from 17t to 16t a couple months back and I noticed the tire slide ~5mm forward when I adjusted the chain tension.

  4. #4
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    Sheldon sez:

    "Note that for each tooth difference, the axle position in the fork end will change by 1/8" (3 mm.)"

  5. #5
    * adriano's Avatar
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    see sheldon.

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