Terence N.wrote a review of Wolf Tooth Components Giant Cog for SRAM XX1/X01 on July 22, 2019
Familiarity: I've put it through the wringer
After 3000+ miles the 42T cog on my XX! cassette was toast. Since all the steel cogs were still in great shape, I decided to get the Wolf Tooth to replace just the worn aluminum (42T) one. It installed easily and works flawlessly. Having the option to change out the cog that usually wears first makes perfect sense. It saves money and resources. Nice work Wolf's Tooth!