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Yeah it’s because of the 130bcd chainset, which is sort of a legacy in my parts bin. Cassette size was chosen based on that. Would technically make more sense to use a smaller BCD and a 34, then not need the huge cassette and long derailleur!
Completely agree about cassettes starting with 12t. Don’t know what it is about the 11, I can see its use for big downhill stuff, but it’s such a horrible grindy solution right at the limit of what the chain wants to do.
Jonny69
I understand you may want to keep your 130bcd chainset, but I think a 48/34 with a 12-30 will give you a similar low-end with smaller gaps at the cassette.
In any case it's a shame that there's not more choice of cassettes starting with 12t sprockets.