11–42T range — low gearing for climbs, high gearing for speed

The 42T low cog gives meaningful mechanical advantage for steep climbs, while the 11T high cog supports faster rolling on flat and descending sections. A 31-tooth spread across nine cogs gives this cassette more range than most 9-speed options — useful for single-chainring setups where the cassette carries the full gear burden.

Optimized step spacing — even gear ratio spread

The cog combination (11-13-15-18-21-24-28-34-42) is designed to give proportionally similar jumps between each gear rather than small steps at the top and large steps at the bottom. More even spacing means less hunting for the right gear and fewer situations where the nearest option is noticeably too hard or too easy.

Continuously moulded cogs — durability and dimensional precision

The cogs are continuously moulded rather than cut from flat stock, which produces more consistent tooth geometry and better dimensional straightness across the full cog. More consistent tooth profiles mean smoother chain engagement and more predictable shifting under load.

Standard HG hub body — broad freehub compatibility

Fits the Shimano HG freehub body standard found on the vast majority of 9-speed wheel builds. No proprietary driver body or adapter required — direct fit on any HG-compatible rear hub.

Advent drivetrain compatibility

Designed to work within the Microshift Advent ecosystem alongside the Advent Super Short Cage Rear Derailleur (#290481-01, $95.49) and Advent Quick Trigger Shifter (#290480-04, $32.99). The derailleur's clutch and spring tension are tuned for this cassette's tooth profile and chain load.