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short cage with big cassette?

Old 07-13-10, 10:43 PM
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short cage with big cassette?

How big can I go with a short cage derailleur? looking to go to a 11-30 cassette with a Shimano 600 derailleur. and 52-42 in the front. when do i have to change to a long cage? will I and or can I have to add a link to the chain?

Last edited by Phydiox; 07-13-10 at 10:47 PM. Reason: error
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Old 07-14-10, 12:58 AM
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The road derailleurs are designed for a maximum cog of 27 teeth. This has nothing to do with the capacity of the cage it is based on the distance between the axle and the guide pulley. YMMV depending on your derailleur hanger.

If your guide pulley clears the cassette you can use the short cage it it doesn't you will need a mountain derailleur.
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Old 07-14-10, 04:28 AM
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You can certainly try it. I'm assuming you've already got the derailleur. Pay attention to the upper pulley on the derailleur, try to adjust the B screw so the pulley and largest cog on the cassette don't interfere with each other in that gear.

I've got a 6700 equipped bike and the derailleur is playing quite nicely with an 11-30 cassette.
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Old 07-14-10, 10:09 AM
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The main need for a long cage RD is to take up slack in the chain when there is a substantial difference in the number of teeth on your chainrings (e.g. tripples). As Bezalel says, the distance between the axle and guide pulley determines how large a cog your RD will play nice with. The length of the derailleur hanger also has some effect on this. Like Davet says, try it--it might be just right.
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