Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 35 Post(s)
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A bit more info would certainly help. Such as the number of speeds, short or long cage, and chainring combination.
But in general, RDs have a capacity based on two considerations. The largest sprocket they can clear, and the chain take up capacity, expressed as the sum of the differences largest to smallest, front and rear. For example, if you have 39/53 chainrings, and a 12-25 cassette you need 14+13 or 27 teeth of take up capacity.
Those capacities are listed by the maker on their spec's page. However, there's usually some fudge room, so I find I can routinely exceed them by about 10% or so.
So you can work this out for yourself, by checking system capacity and then shopping among the various cassettes to fit the system.
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