12-speed Shimano HG road 12-speed (spline L2) cassettes

Both facts a cassette has to match are settled on this page: it mounts on a Shimano HG Road 12-speed only (spline L2) body and shifts 12 speeds. What's left is the gearing range you want — and that your rear derailleur can wrap.

Got here without checking your freehub body? Our guide to identifying your freehub is worth a minute first — the body is the half of this that a wrong guess makes unridable.