Cadence sensor for Spin Bike

I am doing a few spin classes as part of a training regime. The bikes are straightforward spin bikes - mechanical and no electronics. I cannot guarantee getting the same bike every class.
I want to have some measure of effort and the only things I can measure are HR and cadence with them being picked up by my watch or my phone.
If I attach a cadence sensor to my PSD shoes will I record an accurate cadence?
I want to have some measure of effort and the only things I can measure are HR and cadence with them being picked up by my watch or my phone.
If I attach a cadence sensor to my PSD shoes will I record an accurate cadence?
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I am not sure. You have no chance.