The new 10-speed Dura-Ace chain is lighter by an astonishing 24g, yet maintainsThe same durability asThe 9-speed predecessor.The chain also adds a new fluid-smooth feelToThe performance ofThe overall system.The rollers areThe same width as 9-speed, insuringThe important strength and durability. Weight reduction andThe narrower 10-speed profile were achieved by minimizingThe contour ofThe side plates.The super-flush surface ofThe new plates glides more smoothly acrossThe entire cogset, netting
Weaknesses: Possibly slightly less longevity than 7800.
Replace my 7800 chain with this one. Looked identical, weighed only a few g less. Worked great - always shifted quick and clean. It didn't last as long as the 7800 chain in basically identical conditions: After 1,700 miles it's at .75 on a Park chain checker.