Originally Posted by
alcjphil
You are correct, but there have been cassette/ freewheel cogs that have used aluminum alloy big cogs to save weight. The larger the big cog the slower it wears out considering how seldom it is used. Aluminum alloy cassette/ cogs have often been used over the years
Originally Posted by
Hondo6
Well, OK. A 50T cog will take longer to wear out, but not just because it is seldom used. It makes sense that a 50T cog might be alloy for the same reason a 50T large ring would be. The more teeth on a gear, the more the load is spread out vs. say the 11T cog on a cassette.
I doubt you will find a road cassette with an alloy large cog.