Originally Posted by
Jdubstheman
Thanks all again. By replacing my chain (was confirmed stretched by my Park measuring tool) with a new Shimano chain my shifting is actually back to perfect! No new cassette required! However I am toying with taking the cassette up to a 12-30. Is that doable within the specs of the 7700 group I have?
As others have indicated, yes, no, but most likely maybe. If you have an SS RD your max cog is 27t and your max wrap is 29T.
Going to a 30t is dependent on the derailleur hanger and the B screw. Some bikes will allow a push to 30t and some won't.
If you go with a 12-30 and have a 52/42, or other 10t difference crank, you will have a chain wrap of 28t and will be within the RD's max of 29t. If you are running a 53/39 crankset, you might ("probably") be able to push it to 32t chain wrap.
John