The revolution will begin in the back. The SRAM OG-1090 10-speed cassette is the Red-level cassette that changed how we think about the gears in the back. The OG-1090 uses a unique construction method to improve shifting and keep the gram count low. The main cogset is machined out of a single hollow forged form, and then CNC machined to create the complex and completely amazing OpenGlide design. OpenGlide leaves one tooth on each cog "open" for silky smooth shifts and easy up and down shifts. It's stiff, durable, and delivers a titanium-level gram count in solid steel construction.
Full steel construction is stiff and durable, but incredibly lightweight
OpenGlide technology gives you easy up and down shifts
Cassette is forged and machines from a solid piece to keep the weight low and installation easy