Originally Posted by krazyderek
My purposed switch is to replace my 12-25, with a 11-28, and my big 53, with a 49.
I've never seen a 11-28 for sale anywhere - what make/model is that?
I know there's a SRAM 9-speed 12-27 cassette, the PG-970 - Are you sure you wouldn't be happy with a 39-27 'bottom' gear?