- Yes, that would work with one possible caveat.
- If the SRAM XDR is one with the Flattop chain, it’s larger rollers aren’t a perfect match to a typical 1/2" pitch and tooth diameter present in all other non-FT chains. Despite that issue we’ve seen plenty of people using FT chains on non-FT cassettes, so it works with a potential of chain roller wear.
But importantly, you could do the same with any of the many geared to single-speed conversion kits available, you don’t need a Zwift COG. It may be possible to put one together for less than the current $60 intro price.
The main mechanical benefit to the COG that I see is the plastic shell making bike install possibly a bit easier than without, but it may not be all that useful. I wouldn’t be surprised to see 3D print options or other hacks down the line, from this inspiration.
The other reason to snag a COG at the discount now could be hopeful aim that Zwift adds function to other trainers in the future and you’d also have a CLICK to use at that time. But may only matter for those that intend to use Zwift down the line with the COG and virtual shifting.