I believe this information is still current and correct:
Q: Will Zwift offer a frame-only option?
A: At this time, Zwift Ride is only available as a complete bike setup, including the Wahoo KICKR CORE Zwift One. Later this year, we’ll offer the option to purchase the Zwift Ride without a trainer included. At that time, the Zwift Ride will be compatible with trainers that offer Zwift’s virtual shifting—this includes some Wahoo trainers, and we’re also working with additional manufacturers. Currently, the following trainers are compatible with Zwift’s virtual shifting and the Zwift Ride:
- Wahoo KICKR CORE
- Wahoo KICKR v6
- Zwift Hub