Join Date: Feb 2011
Location: Mount Juliet, TN
Bikes: Litespeed Vortex w/ full Dura Ace, Co-Motion Nor'wester CoPilot built up with specifically chosen components
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Mixing nine and ten speed components generally doesn't produce optimum results with the exception of rear derailleurs (which don't seem to care how many gears you have). The crankset for a ten speed cogset will work but with a lot of tuning problems. You may notice some hesitation or miscuing when shifting and you will get lots of slippage (tooth grinding) if you don't have your cable set exactly right for the shifter detents. In short, even though is only a tiny difference in width between a nine and ten speed chain, the tolerances are so close for these systems that it is a significant factor when trying to mix components.
I am curious as to why you are changing cranksets? The chainrings for a ten speed system are thinner - meaning not as robust, durable, strong, etc., as a necessity to accomodate the narrower chain. Why would you want this when you don't need it?
I am one of those luddites who believes that any system that involves more than eight cogs is overkill. I have a ten speed system and I find that for most of my shifts I move two cogs. I still occaisionally do a double cog shift on my nine speed system too but not as often.