The PG 1170 cassette offers gearing options needed for challenging climbs, fast descents, sprints, and everything in between.11-36 option is only compatible with the Force 1 medium cage rear derailleur featuring X-HORIZON™ straight parallelogram shifting. This 11-36 option also offers 13% lower gearing with its 36t cog against the 32t cog on the 11-32 optionFeatures:- Cassette design for high shifting performance with a quieter chain/cassette combination.- Semi-spidered design: light, strong, efficient.Specifications:- Technology Highlight(s): Semi-spidered steel cogs, WiFLi™, PowerGlide™- Weight:247g (11-26)- Material: Heat treated steel cog cluster, Aluminum spider (3 cogs)- Speeds: 11- Recommended Chain: SRAM PC 1170 chain- Sprockets on Spider: 3- Lock Ring Material: Aluminum- Sprocket Material: Steel/ aluminum- Recommended Group: SRAM Force® 1, SRAM Force® 22, SRAM RED® 22- Compatibility: SRAM Force® 1, SRAM Force® 22, SRAM RED® 22, 11-36 Only use with medium and long cage SRAM road rear deraillerus with X-Horizon™ Technology:WiFLi™ = Wider - Faster - Lighter:SRAMs WiFLi™ Technology is based on the compact 2 x 10 - two front chainrings and 10 gears in the rear - design inherent in SRAM Apex and Rival, which delivers a wider range of gears than your standard triple, faster shifts through two chainrings and 10 gears, and with significant weight savings. Its the newest technology from the company that continues to innovate the cycling experience.