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  1. make_beer_not_war on

    Yes, it should be there. That looks like a Sram T-Type cassette. The ring indicates the “setup cogs” used when installing the derailleur to ensure that the chain gap is correct.

    Watch the Sram videos, use the Sram app. Everything needs to be set up exactly as prescribed, and it’s frame-specific. Make sure you torque everything to spec (I wouldn’t risk guessing it). Get it wrong and it won’t shift properly and might even damage your components.

  2. Wirelessness on

    Yes, as others said that is the set up cog indicator. If you don’t read and fully understand the installation instructions you will not have very good results. It’s totally different than any other drive train setup.

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