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I'm old enough to have rocked the triple chainrings. The only time you were ever in the big ring was pavement or some very mellow/shallow fire road. Conversely, I spend probably 90% of the time in the largest cassette cog. Winch and plummet style. I get about 2500 miles on an XO1 before having to replace the largest alloy cog and then another 2500. I get more than 5000 miles on a GX all steel cassette.
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