Disks vs hoop wheel

On the left, a cyclist rolls down a hill without pedaling and without using his brakes. On the right, he does the same but has replaced his wheels with disks.

Which way is faster?

Details and Assumptions:

  • The disks are uniform and have the same mass and radius as the wheels.
  • The friction is sufficient to avoid slipping of the wheels.
  • Neglect the mass of the spokes.

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