Before revision: The resistance is controlled by a knob, wheel or lever that the rider operates, causing the flywheel brake (a common bicycle brake, a friction wheel, a magnetic eddy-current brake, a viscoelastic fluid brake, or a strap running around the flywheel) to tighten.
After revision: The resistance is controlled by a knob, wheel or lever that the rider operates, causing the flywheel brake (a common bicycle brake, a friction wheel, a magnetic eddy current brake, a viscoelastic fluid brake, or a strap running around the flywheel) to tighten.