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  1. #1
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    gears and derailleur cage size

    If I am running a 48/39 Crankset with a 12-25 cassette....will a short cage road derailleur be enough?

  2. #2
    Senior Member capwater's Avatar
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    That ought to work.

  3. #3
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    Is there any rule of thumb for this situation? Any formula or anything?

  4. #4
    Small Member maddmaxx's Avatar
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    The manufacturers spec for a rear derailleur sheet will list 2 different numbers. One is the max number of teeth on the cassette and the other is the total number of teeth that the derailleur will take. In your case 25-12 for 13 in the rear plus 48-39 for 9 in the front. 13 + 9 gives you a total tooth count of 22. This should be within the specs for a short cage rear derailleur. The spec sheet is conservative.

  5. #5
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    Thanks.

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