Ultegra offers smooth shifting and light weight. To achieve this the larger cogs are mounted to an aluminum carrier. A wide variety of gearing options let you choose just the right combo for your ride. Shimano-patented ramps and tooth profiles ensure effortless shifting.
Compatible with both Ultegra or Dura-Ace 10 speed cassette bodies, as well as 9 speed 105, Ultegra, Dura-Ace, and most other 9 speed cassette bodies
6700 series cassette has reduced ratchet surface and other machining of material to reduce weight. However, this does have an impact on performance. Also, the 12/27 range which is optimal for CX is not available for the 6700. I have multiples sets of both cassettes and prefer the 6600 for CX and Criterium racing. There is a difference regardless of what the moron who posted the other review notes.
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