18" Wheel Size - What do I choose?

I have a Sunny Health SF B1002 Spin Bike. The wheel is 18" in Diameter. This option is not supported by the drop down box when pairing a SPEED Sensor.

I assume I should choose the 20" option? What about for the trainer type? I can selected “unlisted trainer” or “unlisted roller”. Is there a difference?

Thanks for any help I can get!!

You can pick anything since the spin bike don’t follow the same setup as a bike on a trainer.

Pick something that give you the same speed as in real life.

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