TheSRAM PG-1170 11 Speed Cassette produces fantastically high shifting performances on a consistent basis, featuring a new design to create an overall quieter unit that is reliable as ever! Featuring a semi-spidered design the SRAM Cassette is light-weight, strong and incredibly efficient, with the 16 tooth cog adding even greater power into the shifting action you can expect instant and accurate shifting at all times with theSRAM PG-1170 11 Speed Cassette! SRAM PG-1170 11 Speed Cassette Features Weight: 231 grams Material: Heat Treated Steel Cog Cluster 16T Cog Gear Ratios: 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 Speeds: 11 Lock Ring Material: Aluminium