Stock cassettes

Every sequence is checked against manufacturer documentation — Shimano's exploded-view parts sheets, SRAM's per-model spec tables, Campagnolo's spare-parts catalogue, and each other brand's own product pages.

A few absences are deliberate rather than accidental. microSHIFT makes no 12- or 13-speed cassette, and neither does Shimano — both confirmed, not overlooked. A handful of ratios are left out because no reachable source resolves their cog sequences, and a few brands publish no authoritative tooth data at all.

It is still not exhaustive, and it never will be. If a sequence looks wrong to you it may well be — tell us and we will fix it.

A cassette knows its own sprockets and what kind of riding it is for, and nothing else about the bike — so the link carries the riding style, and that fills in the rest: 50/34 and 28 mm for road, 40T and 40 mm for gravel, 32T and 2.25 in for MTB. The style also sets how strictly the gaps are judged. Change any of it once you are there; the address bar keeps up.