The SRAM PG1170 is a cassette designed for high shifting performance with a quieter chain, cassette combination. Its semi-spidered design is light, strong and efficient. Cassette design for high shifting performance with a quieter chain/cassette combination.,Semi-spidered design: light, strong, efficient.,16T cog,231g (11-25).,Gear ratio:11-25: 11,12,13,14,15,16,17,19,21,23,25,11-26: 11,12,13,14,15,16,17,19,21,23,26,11-28: 11,12,13,14,15,16,17,19,22,25,28.,WiFLi 11-32 cassette option:11-32: 11,12,13,14,15,17,19,22,25,28,32.,Semi-spidered steel cogs.