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SRAM Red Black Cassette OG-1090 
- Simplicity, elegance, efficiency and above all, performance
- The main cogset of the OG 1090 is machined out of a single forged form that is heat treated and then shaped in a complex series of CNC-guided operations never before seen in this type of application
- Open Glide design for smooth as silk up and down shifts
- 160 grams
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