Join Date: May 2007
Bikes: KUUPAS, Simpson VR
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Each company designs their chain/cassette combination to work together. There are also patent issues that have to be designed around. I am not EXACTLY sure which precise elements of the HG system are patented so I can only generalize here.
Typically, when chain makers say "compatible" what they are talking about is width. I have tested other 10 spd chains on a Campagnolo system and they all were louder and less durable than the Campagnolo chains.
Although I haven't personally done it, I imagine that the reverse would also be true and other brand chains would perform sub-par to the designated Shimano chain.
I'm sure now, other will post and sign the ballad of the Wipperman (or other brand) chain, and extol the virtues of their favourite brand ad infinitum, BUT the difference here is that we are talking about Campagnolo compatible.
Because Shimano dominates the OE market, all designers want to displace Shimano in the OE with the goal of increasing aftermarket share. SO...they design to be as Shimano compatible as possible.
Since Campagnolo is mostly an aftermarket company (really) no-one truly designs to THEIR specs. Companies will SAY they are Campagnolo compatible, but it is almost as an afterthought.
Last point, IF you agree that Shimano works better on Shimano and Campagnolo works better with Campagnolo, then you must accept that there are differences. How them, would it be possible, to design a chain (or any other product) that works better than the original products ON BOTH???
That would be quite a feat of engineering.
Long answer to a seemingly simple question, I know. The short answer: It will always be noisier and won't last as long as the Chorus chain the group was designed to use. Ride the chain until it starts to stretch and then replace it with the Chorus chain. If you get it early, the cassette should be fine.