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I was very disappointed to find that my XX1 42t cog wore out so quickly. I am meticulous about cleaning my drivechain and lubing it before every ride too. I was about to buy another cassette at $350 when I found this much better option. The rest of the cogs aren't worn at all. This Wolf Tooth replacement cog was just what I needed. It was super easy to install and it shifts just as good as the SRAM original. I also got a little extra climbing grunt by going with the 44T. Awesome upgrade!!!
Verified purchase: Yes | Condition: New