Features:

 HG80 Mega9 cassette featuring light weight minimal design sprocket carrier

The 3 largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity

Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load

Close ratio gearing allows a more efficient use of energy through finer cadence control

Sprockets are cut away and drilled to reduce weight without reducing rigidity

For Super Narrow 9-speed HG chains