11 - 12 - 13 - 14 - 16 - 18 - 21 - 24 - 28 Teeth The 11-28t is particularly intended for travel bikes, compact recumbents and other bikes with smaller than usual drive wheels. It is generally good practice to replace the chain when you replace the cassette. We recommend the SRAM PC-951 chain for use with this cassette. This cassette is compatible with any 9-speed derailer system. 11 tooth top gear, not compatible with some older hubs. (Click here for details) You can check the gearing options out with our On Line Gear Calculator
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