All the sprockets have the same 1.370x24 thread. You mean lock ring, in which case 1.290x24 for Goldtec, i.e. Dura Ace
@gbj_tester started
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All the sprockets have the same 1.370x24 thread. You mean lock ring, in which case 1.290x24 for Goldtec, i.e. Dura Ace