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Possible Duplicate:
Road Shifters, Mountain Rear Derailleur?

I'm looking to build a hardtail mountain bike with drop bars for commuting, touring and some occasional light off-road adventures.

Are 10-speed Shimano brifters like the Ultegra ST-6600 compatible with the 10-speed Dyna-Sys XT derailleurs?

Thanks.

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In a word, no. Different cable pull ratio on both systems. You can check out this question if you want a slightly more verbose answer.

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  • Back to the drawing board... – jpmartineau Dec 6 '11 at 0:18

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