Shimano Ultegra CS-6600 10 Speed Cassette - 15-25T

- High performance 10-speed Road cassette.
- 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.
- Three largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity.
- Sprockets are cut away and drilled to further reduce weight without reducing rigidity.
- Nickel-plated finish offers hard wearing resistance to corrosion.
- Chrome-plated steel cassette lockring.
- For Super Narrow 10-speed HG chains

Ratios:
- 15-25T = 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 25