Vo2Max measurement for biking

There is a VO2Max measure in my new FR 955. After one run it calculated something.

There is also another VO2Max metric for biking but here it says I have to bike with heartrate sensor and power meter to get something.

What does this mean? 

Do I need to attach those expensive power meter pedals or is something else also enough? Thinking about the speed/cadence sensor for 50 Euros. Do I get any power measures from this setup? 

  • Do I need to attach those expensive power meter pedals

    Yes

    or is something else also enough?

    There are also crank, spider, and hub based power meters.

    Thinking about the speed/cadence sensor for 50 Euros. Do I get any power measures from this setup? 

    No.

  • You can also connect Power meters occasionally through Spin bikes at gyms (Stages make nice bikes if you can find a gym with them or similar smart spin bikes with power connection option).  Also can use Smart Trainer with your bike inside if you get one.  Both power pedals (Assioma uno among others are not super expensive these days) and Smart Trainers are coming down in price regularly!  Zwift and other virtual platforms are fun!