You can build custom Shimano (and probably Miche and Campag) cassettes. You don't get the silly 9T and 10T options but you'd be able to get pretty specific with a custom cassette.
No rush, I'm interested in something silly with 10t. I was silly enough to go 1x, let's go full hog.
Give it enough time and I'll probably wish I spent extra on Rival22 but can always switch this stuff around :) the fun and games of self builds.
@spinnnout started
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You can build custom Shimano (and probably Miche and Campag) cassettes. You don't get the silly 9T and 10T options but you'd be able to get pretty specific with a custom cassette.