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cassette? i live in central florida. almost pancake flat. my bike came w a compact crank w an ultegra 12-23. i switched out to a dura ace 12-21 straight block cassette. totally great gearing for me, especially as the bike replaced an old 6 sp w a 13-18 freewheel. is there another source for a 12-21 other that a dura ace? kind of expensive and hard to come by. can dura ace cogs be replaced individually? is there an option other than the titanium innermost cogs that come on the dura ace? thanks.
 

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Dura-ace cassettes use Ti for the 18t and larger cogs. Individual cogs are available but you will probably have to order them, and they are not cheap.

It looks like Shimano made 12-21 Ultegra cassettes for 9sp but not 10sp. You can put a 9sp solo cog in an otherwise 10sp cluster but you can't use a 9sp gang of cogs in a 10sp cluster.

Another option would be a set of 52/38 chainrings and the 12-23 cassette.
 

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ericm979 said:
Another option would be a set of 52/38 chainrings and the 12-23 cassette.
That's kind of where I would go—I'd ditch the compact if I were a strong flatland rider. You could go back to Ultegra cassettes. For example, the CS-6600 13-25 gives you 1-tooth steps from 13 to 19; the CS-6600 junior 14-25 is straight from 14 to 21. Only hitch is that you don't have to mind (like I certainly would) being seen with a weakling's 25T in the back. :D
 
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