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The PG 1070 Cassette s semi-spidered design maintains a high level of shifting performance with a matched cassette/chain combination that runs near silent. Technology Highlights: PowerGlide IIWeight: 359g (12-36T)Speeds: 10-SpeedRecommended Chain: PC 1091R, PC 1091, PC 1071, PC 1051, PC 1031Recommended Group: SRAM Force, SRAM Rival