Here is another option:
Do a flat ride on Zwift while also doing the ride on SYSTM. That allows you to use Zwift to control the virtual gearing while SYSTM is recording your power and HR.
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Here is another option:
Do a flat ride on Zwift while also doing the ride on SYSTM. That allows you to use Zwift to control the virtual gearing while SYSTM is recording your power and HR.