Patent ID: 8011734

Claim:
A variable resistance wheel for a rolling vehicle, and the vehicle has one or more shafts for mounting wheels thereon, wherein the wheel comprises; a rim having a hole through its center for mounting the wheel on a shaft of the vehicle, the rim having at least one bearing that is mounted in the center mounting hole and the bearing permits the rim to rotate on the shaft; a tire mounted on the rim furthest from the hole through the center of the rim; a seal mounted in and concentric with the hole through the center of the rim and the shaft passes through the seal, the seal pressing against the shaft, and the seal has a recess that forms a chamber around the shaft when the seal is pressing against the shaft; and a viscous grease that is contained in the chamber and contacts the shaft; wherein the grease creates a kinematic shear action resistance to the rotation of the wheel about the shaft, and the grease is changed to change the kinematic shear action resistance to the rotation of the wheel.