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I looked at these, but I don't wear out just the big cog on my XX1 cassette -
more like the biggest 4 cogs. I'm going to try an E.13 TRS+ cassette since you
can buy the biggest cogs separately. I should be able to replace them 2 or 3
times before I wear out the smaller cogs. By that point we'll be using ionic
hover jets on mountain bikes. 😉
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