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Old 08-01-06, 08:06 AM   #1
Leviathan
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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?
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Old 08-01-06, 08:10 AM   #2
capwater
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That ought to work.
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Old 08-01-06, 08:22 AM   #3
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Is there any rule of thumb for this situation? Any formula or anything?
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Old 08-01-06, 08:33 AM   #4
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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.
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Old 08-01-06, 09:17 AM   #5
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Thanks.
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