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Thread: gear ratios...

  1. #1
    Senior Member claude's Avatar
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    Hi to all,

    sorry if this question might seem banal to you people, but I just realised (about time I did ??) that newer bikes have got much smaller chainrings than my 10 year old MTB... want to make sure before I buy some bits...

    Is the gear ratio measured as the difference between the number of teeth between the chain ring and cog ? Would a, for example 44-11 gear ratio feel exactly the same as a 48-15 ??

    thanks for any feedback

    claude

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    Member madsnake's Avatar
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    Chainrings

    The formula is:

    number of teeth on chainring/number of teeth on cog x wheel diameter = gear inches. The result is the distance travelled for one pedal revolution.

    Hence 44:11 = 104 gear inches.
    48:15 = 83 gear inches.

    52:13 would give you 104.

    A good cycle mechanics book should give give you a table of gear inch equivalents.


  3. #3
    Senior Member claude's Avatar
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    so, if I understood correctly, my older bike with a 48:13 ratio would actually be slower than a newer bike with 44:11 ratio, although the difference in teeth is actually more in the older bike....

    claude

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