Originally Posted by thewalrus
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?
IRD makes a 9s 11-28. They also make a 9s 12-28.
But my point is why reduce the chainring to 49T to make the 11T work when you could just buy a 12-28 and be done with it?