Is the cog available alone? I already have a pair of the Zwift controllers so I don’t need the Click.
TIA…
Zwift does not sell it alone but you can buy a third party single speed cassette. They don’t have all the Cog features but they work fine. Chain line adjustment will involve moving spacers around.
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Of course. I have plenty of cassette cogs and spacers to choose from. I like the Zwift Cog because the plastic sides make it easy to change bikes for someone not as familiar with the process as someone who’s been doing it for 50 years.
Besides that, not selling it separately makes no sense as it’s a wear item. Seeing some of the miles my Virtual Friends are putting down on these, they’re going to need to replace them fairly regularly. With the Cog, you’re not spreading drivetrain wear across a range of gears on top of the fairly spotty chain maintenance that many of us do on our indoor equipment. ZHQ needs to think a bit about this. I’m pretty sure people aren’t going to want to buy a new set of Clicks everytime a Cog wears out.
Going on recent hardware, the Cog will oulast the Clicks. 
They replace worn out Cogs at no charge. I don’t disagree it should be sold by itself.