Ratio's New 1×12 Road Upgrade Kit Converts 10 or 11 Speed to 12 Speed | The Radavist | A group of individuals who share a love of cycling and the outdoors.
Ratio DIY Mullet 12 speed kit converts 11sp SRAM mechanical to shift Eagle derailleurs - Bikerumor
Ratio 2x12 DIY Kit takes 11sp SRAM mechanical road to 12sp - Bikerumor
Review: e*thirteen's New TRS Plus 12-Speed Upgrade Kit - Pinkbike
Ratio now allows you to turn your 2x11 SRAM mechanical drivetrain into a 12- speed system | road.cc