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As already noted, just about every current brand of 10 spoeed chain is now 5.9mm wide, so there is no width issue.
There is no reason a Campy UN chain won't work as well and although it may cost a little more, it will elongate at about 1/4 the rate of a Shimano chain, so it should last longer. With a well maintained Campy chain, elongation ( measured with a ruler) won't tell you when to change the chain. Roller and side wear rates are much larger. I alternate three chains at 2500 mile intervals (maximum), when my chains are about half worn. Each gets a second rotation and is trashed when the distance between the rollers gets into the .235-.240 range.
The KMC DX10XC chain seems to shift nicely and has a quick-link. I don't have any wear data yet, but I'm working on it. Performance has this chain on sale for $20-23. Might be the best deal out there. If I was paying $40 or more, I'd get a Campy UN.
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