TheShimano HG200 7 Speed Cassette 12-28T. A great value 7 Speed cassette with hyperglide sockets and a corrosion-resisant lockring. Shimano HG200 7 Speed Cassette 12-28T Features Great value 7-speed cassette Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load Corrosion-resistant steel cassette lockring For 7-speed HG chains
Best Price: £21.99 from Leisure Lakes Bikes