Originally Posted by biker128pedal

Sitting here this morning looking at gearing order for my Domane with the 11-28 I put on this thread is interesting. My Domane came with the 11-34 and I put on the Shimano 11-28. Looking a the tooth spacing and gearing both have 3 cogs with duplicates within about and inch. If the 17t were a 16t it seem it would fil in a gap in the gearing and and reduce the close gearing to two. On the 11-34 if there were an 34tx16t and then the 50tx23t would be close but my simple calculations show 180 and 184 vs the current 170 and 170. The current I figure still has the 222 / 223 and the 151 / 152.

When I was looking to replace the 11-34 cassette I have a note I saw an 12-27 SRAM. Except the smallest was a 12 the tooth spacing was better. I just shied away from because of the 12. For my area the largest 27 would work. May be when I need a new cassette.
12-13-14-15-16-17-19-21-23-25-27

EDIT: I should have looked before posting. I don't see a SRAM 12-27. Just a SRAM 11-28 with the same duplicates.