The front and rear wheel assemblies include pneumatic tires.

At least one of the guiding wheel (23) and the clipping wheels (21, 22) is a driving wheel.

The upper drive wheels comprise an inner wheel (1) and outer wheels (2) being coaxial with the inner wheel.

A front wheel icon (38) and a rear wheel icon (40) respectively represent the front wheels (22) and the rear wheels (24).

The drive gear assembly includes a drive gear (9) that is adapted to mesh with a driven gear (7), the drive gear and the driven gear each having an axis about which the gears can rotate.

The receivers are in electrical communication with the actuators of the wheel assemblies.

The wheels are mounted on foldable wheel frameworks.

The wheels include a drive wheel for driving the track.

Likewise the planet wheels and the sun wheel are of like polarity so that the planet wheels will rotatably drive the sun wheel.

In each of such roller skates (1), the wheels (3) include a front wheel (3a) and a rear wheel (3b).

The wheel assemblies may be operatively connected to the legs of the frame.

A bearing is inserted, at least indirectly, between the primary wheel and the secondary wheel, and absorbs the radial forces and/or axial forces acting between the blade wheels.

The wheels includes a front wheel (4) and a rear wheel (5) which are fixed on the front pedal and the back pedal, respectively.

The last couple of laps were a lot of fun with some good wheel-to-wheel racing.

The frame of the stroller comprises a pull/push rod; a right and a left front wheel rod, each provided with a front wheel; and a cross bar system (6) provided between the front wheel rods, on the front wheels.