SRAM Red 22 XG 1190 11 Speed Cassette: The new SRAM RED Powerdome X 11 speed cassette is the most advanced cassette ever made. Its super light, deadly silent, & delivers an undeniable performance advantage. Powerdome X Inspired from the combination of OG1090 (SRAM RED) & the XG 1099 (SRAM XX) cassettes, the heat-treated high-grade tool steel features hollow construction with CNC-machined cogs & rear cut-outs for reduced weight & added stiffness. The result is the stiffest & lightest cassette weve ever built. Stealth Ring Specially designed & incredibly durable elastomers placed in between the cassettes cogs to eliminate vibrations & noise. Hollow steel dome makes for the stiffest gear cluster ever at the lightest weight. Heat-treated, high-grade tool steel provide superlative durability & a beautiful finish. Stealth Ring elastomers & advanced tooth profiles eliminate vibration & noise for a smooth, silent ride. Aluminum cog: lighter, stiffer, stronger due to the design, material & production process. Weight: 151g (11-25T) Recommended Chain: SRAM RED 22 chain, SRAM PC-1170 chain 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