The invention relates to a bicycle gearing, comprising: a cylindrical-gear gearing (10), which has a stationary sun gear (11) having a central bearing axis (y.sub.1) extending centrally therein and a planet gear (12), which travels on the sun gear (11) and rotates about a planet-gear bearing axis (y.sub.2); a four-bar linkage (20), which interacts with the cylindrical-gear gearing (10) and which comprises a crank (21), which is fixedly connected to the planet gear (12) and is rotatably connected to a pedal crank (22); and a toothed wheel (30), by means of which a traction means (31) can be driven. The problem addressed by the invention is that of improving a bicycle gearing of the type in question in such a way that a rounder pedaling feel is perceived by the bicycle rider. The problem is solved according to the invention in that the toothed wheel (30) has an oval shape.

The invention relates to a bicycle gearing, comprising: a cylindrical-gear gearing (10), which has a stationary sun gear (11) having a central bearing axis (y.sub.1) extending centrally therein and a planet gear (12), which travels on the sun gear (11) and rotates about a planet-gear bearing axis (y.sub.2); a four-bar linkage (20), which interacts with the cylindrical-gear gearing (10) and which comprises a crank (21), which is fixedly connected to the planet gear (12) and is rotatably connected to a pedal crank (22); and a toothed wheel (30), by means of which a traction means (31) can be driven. The problem addressed by the invention is that of improving a bicycle gearing of the type in question in such a way that a rounder pedaling feel is perceived by the bicycle rider. The problem is solved according to the invention in that the toothed wheel (30) has an oval shape.

A crank assembly for a bicycle includes a crank axle rotatably mounted to a frame of the bicycle, and a carrier shaft slidably mounted on the crank axle and configured to slide in a direction substantially parallel to a central longitudinal axis of the crank axle and relative to the crank axle. The crank assembly also includes an elliptical sprocket mounted on the carrier shaft. The elliptical sprocket rotates to move the bicycle in response to a rotation of the crank axle. A start time of a power stroke of the elliptical sprocket is changed by sliding the carrier shaft relative to the crank axle.

A crank assembly for a bicycle includes a crank axle rotatably mounted to a frame of the bicycle, and a carrier shaft slidably mounted on the crank axle and configured to slide in a direction substantially parallel to a central longitudinal axis of the crank axle and relative to the crank axle. The crank assembly also includes an elliptical sprocket mounted on the carrier shaft. The elliptical sprocket rotates to move the bicycle in response to a rotation of the crank axle. A start time of a power stroke of the elliptical sprocket is changed by sliding the carrier shaft relative to the crank axle.

A vehicle has a vehicle frame, two front wheels, a rear wheel. An engine with at least one cylinder is mounted to the vehicle frame such that a cylinder plane extends generally longitudinally and vertically. At least a portion of the at least one cylinder is disposed forward of a front wheel plane. A transmission assembly disposed longitudinally rearward of the engine. A straddle seat is disposed at least in part longitudinally rearward of the assembly. The engine is entirely disposed between a center of the left footrest and a center of the right footrest in the lateral direction.

A vehicle has a vehicle frame, two front wheels, a rear wheel. An engine with at least one cylinder is mounted to the vehicle frame such that a cylinder plane extends generally longitudinally and vertically. At least a portion of the at least one cylinder is disposed forward of a front wheel plane. A transmission assembly disposed longitudinally rearward of the engine. A straddle seat is disposed at least in part longitudinally rearward of the assembly. The engine is entirely disposed between a center of the left footrest and a center of the right footrest in the lateral direction.

A ride-along vehicle may include a guard that attaches to a bottom portion of a molded plastic body and covers a spring and chain assembly. The guard may also provide an attachment point for the spring through a hole in the guard. The guard may have a narrow portion that covers and helps retain the chain on a sprocket as well as a wider portion that covers the spring. An improved pumper arm and steering mechanism may include a pivot joint that is provided by rods, pins, or bolts attached to opposite sides of the pumper arm. The universal joint between the steering arm and the pumper arm can be aligned with the center of the pivot point to prevent rocking of the steering arm as the pumper arm is actuated.

A ride-along vehicle may include a guard that attaches to a bottom portion of a molded plastic body and covers a spring and chain assembly. The guard may also provide an attachment point for the spring through a hole in the guard. The guard may have a narrow portion that covers and helps retain the chain on a sprocket as well as a wider portion that covers the spring. An improved pumper arm and steering mechanism may include a pivot joint that is provided by rods, pins, or bolts attached to opposite sides of the pumper arm. The universal joint between the steering arm and the pumper arm can be aligned with the center of the pivot point to prevent rocking of the steering arm as the pumper arm is actuated.

A vehicle includes a frame; two front ground-engaging members connected to the frame; a rear ground-engaging member connected to the frame; an engine supported by the frame; a powertrain operatively connecting the engine to the rear ground-engaging member; a seat connected to the frame; an exhaust system connected to the engine and supported by the frame; a swing arm operatively connecting the rear ground-engaging member to the frame; and a rear suspension operatively connected between the swing arm and the frame. The seat is positioned at least partially above the swing arm. The exhaust system is positioned at least partially below the swing arm. Each of the rear suspension and the powertrain is at least partially concealed by the swing arm from at least two of a top, a left side or a right side of the vehicle.

A vehicle includes a frame; two front ground-engaging members connected to the frame; a rear ground-engaging member connected to the frame; an engine supported by the frame; a powertrain operatively connecting the engine to the rear ground-engaging member; a seat connected to the frame; an exhaust system connected to the engine and supported by the frame; a swing arm operatively connecting the rear ground-engaging member to the frame; and a rear suspension operatively connected between the swing arm and the frame. The seat is positioned at least partially above the swing arm. The exhaust system is positioned at least partially below the swing arm. Each of the rear suspension and the powertrain is at least partially concealed by the swing arm from at least two of a top, a left side or a right side of the vehicle.