Originally Posted by
Hmmm
I have 5700 10 speed and I switched to a 12-30. It's amazing for the steep climbs of the Rocky Mountains! I have never missed my 11.
Yeah, I can't figure out why Shimano never actually made a 5700 12-30, and apparently they're not making a 12-30 for the new Tiagra 4700 either. It's only ever been a Ultegra 6700 cassette, and as others have stated in this thread, they're getting scarce.