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@Scilly.Suffolk
According to Sheldon the Biopace position evens things out (rather than maximising the power stroke), slowing the change of direction of the leg which is easier on the knees.
Adopting a "safety first" approach, I'll start with this before trying them as Rotor intended.
However Biopace and Q-Rings aren't the same shape, so even if they do function in this position, they might not produce the same results...