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I, also, have no recorded data to show but I think the modern stuff wears faster than the older and wider cogs and chains. Back ith the day before 7 speeds were the boss chains had real bearing bushings. The cog plates were thicker and I know some who say were of a harder steel (softer steels cost less to stamp and form all those shifting aids in).
All this is personal observation, stories told by various industry members and some basic design principles. Andy
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AndrewRStewart