Bicycle Mechanics - gears and derailleur cage size
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
08-01-06, 09:06 AM
If I am running a 48/39 Crankset with a 12-25 cassette....will a short cage road derailleur be enough?
08-01-06, 09:10 AM
That ought to work.
08-01-06, 09:22 AM
Is there any rule of thumb for this situation? Any formula or anything?
08-01-06, 09:33 AM
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.
08-01-06, 10:17 AM
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.