I have a Shimano 12-27 ultrega 10 speed cassette now. I'd like to convert it to a 14-34 by adding some flat clogs (30t and 34t) and a first position 14t (if it exists) to make a 14-15-17-19-21-23-25-27-30-34. I dont not like the 11-34 10 speed offered by IRD because i do not need the 11t, 12t, and 13t for my situation. Is this an option for my 10 speed? Any other suggestions?
Anyone heard of a 14t first position 9 speed cog being ground down to the width of a first position 12T 10 speed cog?