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Replacing 7 speed freehub body with 8, 9, 10, 11s freehub. 3x7 to 2x9 or 1x11 drivetrain upgrade. - YouTube
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Amazon.com : Bibike 8/9/10/11 Speed Bike Cassette 11-25T/11-28T/11-32T/11-36T Lightweight Road Bike Cassette Compatible with Shimano Sram(Except XD) : Sports & Outdoors
![Upgrade Your SRAM 11-Speed Drivetrain To 12 Gears With A Kit From E*Thirteen - Singletracks Mountain Bike News Upgrade Your SRAM 11-Speed Drivetrain To 12 Gears With A Kit From E*Thirteen - Singletracks Mountain Bike News](https://images.singletracks.com/blog/wp-content/uploads/2018/06/Full-Kit1.jpg)