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 1x13C Upgrade Kit: 11-speed to 13-speed Ekar Conversion - BIKEPACKING.com
Convert SRAM 11 speed to 12 with new e*thirteen TRS Plus upgrade kit | off-road.cc
Shimano Deore M5100 MTB 1x11 Speed SL/CS-M5100 11-42T R