I’m running a bike with the compact crankset (50/39, 11/25) on the Tacx Vortex smart.
50;15 is the optimal chain position and works well at lower power sections. Higher power segments tend to put me in to the uncomfortable high cadence.(115+)
50;11 puts lot of strain and unnecessary wear on the drive train but is the only way I can achieve reasonable wattage (group B) with normal or slightly elevated cadence (90-100).
300W requires 120rpm which may be ok for a short sprint but not an endurance ride. 130rpm is definitely uncomfortable for me.
According to the Zwift instructions we not supposed to shift in the ERG mode so it looks like I’m stuck in the lowest cog for now in order to maintain somewhat comfortable cadence.
Now, I would like to know how to approach group A training and complete higher wattage segments at reasonable cadence +/- 90rpm.
Please post your positive experience, what you have done and what worked for you. I like to find the solution to this “glitch” and I appreciate the team effort. J