Is there any reason why connex links are incompatible with 9 spd Dura ace chains , i'm using one on my current chain ( dura ace ) but it has always emitted a slight ticking sound on certain cogs which I have always put down to a worn freehub making the cogs run slightly out of true .As i'm about due to replace the chain and have a new freehub to fit i'm wondering whether to stick with the dura /connex combo or try a sram pc 89r that comes with it's own "powerlink" . Any advice ?