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While looking in a couple of online stores at the Mega Exo Compact K-Force and SLK, I see there is one model for Campy 10sp/Shimano 9sp and a different model for Shimano 10sp. I have never seen this before. Many other websites show one model for all 3. What is the difference between them. Thanks for the help!
 

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different shifting ramps...

The shimano 10 chain is narrower and didn't work well with the 9/10 ramps made for the wider campy 10 and shimano 9 chains. Different ramps on the inside of the big ring is the difference.

Campy has narrowed their chain for 2006, so perhaps campy users will have a similar problem as the new chains come into wider use.
 
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