A roller ski adapter system is disclosed. Said roller ski adapter system comprises a ski adapters, a skis, a poles and a brake lines. Said ski adapters comprises a front adapters and a rear adapters. Said poles comprises a shaft, a brake lever assembly, a first end, a second end and a grip. Said brake lever assembly comprises said brake lines, a lever and a cable guide. Said front adapters comprises a squeeze plate assembly, a trucks and a wheels. Said rear adapters comprises a braking system, a rear wheel assembly, a squeeze plate assembly, a trucks and a wheels. Said braking system comprises a braking bar, a brake line, a one or more spring assemblies, a splitter and a brake lines. Said one or more spring assemblies comprises a first end, a second end, a first bracket, a second bracket and a one or more braking bar fasteners.

A roller ski adapter system is disclosed. Said roller ski adapter system comprises a ski adapters, a skis, a poles and a brake lines. Said ski adapters comprises a front adapters and a rear adapters. Said poles comprises a shaft, a brake lever assembly, a first end, a second end and a grip. Said brake lever assembly comprises said brake lines, a lever and a cable guide. Said front adapters comprises a squeeze plate assembly, a trucks and a wheels. Said rear adapters comprises a braking system, a rear wheel assembly, a squeeze plate assembly, a trucks and a wheels. Said braking system comprises a braking bar, a brake line, a one or more spring assemblies, a splitter and a brake lines. Said one or more spring assemblies comprises a first end, a second end, a first bracket, a second bracket and a one or more braking bar fasteners.

The present disclosure comprises a novel system that attaches to skis in an alpine touring setup and provides electric, battery powered, motorized traction that assists the skier when traveling uphill or horizontal on snow. In one embodiment, the devices removably attach to the ski near the tail and have a cylindrical traction surface that sits below the ski near the tail. The traction surface is powered by an electric hub motor which engages, either with initiation of forward movement, input from sensors, or a set programmed cadence, thereby assisting the user's moving, unweighted ski forward until the completion of that step. Once arrived at the desired destination, or when downhill travel is warranted, the user removes and stores the devices from each ski and proceeds downhill.

The present disclosure comprises a novel system that attaches to skis in an alpine touring setup and provides electric, battery powered, motorized traction that assists the skier when traveling uphill or horizontal on snow. In one embodiment, the devices removably attach to the ski near the tail and have a cylindrical traction surface that sits below the ski near the tail. The traction surface is powered by an electric hub motor which engages, either with initiation of forward movement, input from sensors, or a set programmed cadence, thereby assisting the user's moving, unweighted ski forward until the completion of that step. Once arrived at the desired destination, or when downhill travel is warranted, the user removes and stores the devices from each ski and proceeds downhill.

A tracked skate runner provides a low-profile substitute for a wheel with exceptionally low rolling resistance on rough or soft terrain. The runner includes a skate frame and rollers that bear against an endless track of hinged links devoid of pinch points that can get jammed with ground debris. The skate frame provides a channel with sidewalls and a top dirt shield. The sidewalls fit closely with the links of the track to seal out dirt, and the top dirt shield protects the rollers from dirt that shakes off the top recirculating portion of the track.

A tracked skate runner provides a low-profile substitute for a wheel with exceptionally low rolling resistance on rough or soft terrain. The runner includes a skate frame and rollers that bear against an endless track of hinged links devoid of pinch points that can get jammed with ground debris. The skate frame provides a channel with sidewalls and a top dirt shield. The sidewalls fit closely with the links of the track to seal out dirt, and the top dirt shield protects the rollers from dirt that shakes off the top recirculating portion of the track.

The present disclosure provides an approach to propelling an activity board. The approach involves, for example, a propulsion device comprising a driver transitionable between a first position and a second position, a motor operatively connected to the driver, and a power source operatively connected to the motor. The driver, when in the first position, is above a plane of an activity board and when in the second position, is below the plane of the activity board. A mount may apply a force to the driver. The approach also involves, for example, an activity board comprising a mount coupled to the activity board, a driver connected to the mount, the driver driven by a motor, and a power source operatively connected to the motor. The activity board comprises a top surface and a bottom surface configured to traverse a terrestrial surface. The driver is transitionable between a first position and a second position and, when in the first position, is located above the bottom surface, and, when in the second position, is located below the bottom surface. The approach further involves, for example, a method for propelling an activity board comprising transitioning a driver from a first position to a second position characterized by the driver engaging a terrestrial surface and actuating a motor operatively connected to the driver, the motor coupled to the activity board via a mount. The motor is powered by a power source mounted to the activity board.

A tracked skate runner provides a low-profile substitute for a wheel with exceptionally low rolling resistance on rough or soft terrain. The runner includes a skate frame and rollers that bear against an endless track of hinged links devoid of pinch points that can get jammed with ground debris. The skate frame provides a channel with sidewalls and a top dirt shield. The sidewalls fit closely with the links of the track to seal out dirt, and the top dirt shield protects the rollers from dirt that shakes off the top recirculating portion of the track.

A tracked skate runner provides a low-profile substitute for a wheel with exceptionally low rolling resistance on rough or soft terrain. The runner includes a skate frame and rollers that bear against an endless track of hinged links devoid of pinch points that can get jammed with ground debris. The skate frame provides a channel with sidewalls and a top dirt shield. The sidewalls fit closely with the links of the track to seal out dirt, and the top dirt shield protects the rollers from dirt that shakes off the top recirculating portion of the track.