Versions prior to Wahoo Kickr v6, such as the Kickr Core, are compatible with the Zwift Click & Cog - Virtual Shifter, provided you remove the freehub supplied with the kit and fit it to the freehub of your existing Kickr. This compatibility has been confirmed by users and tests, although the Zwift site may not yet reflect this update. The Zwift Cog kit is designed to work with several Wahoo models, including versions prior to Kickr v6.