TRA4K is a patent-pending inertial mass device that can be mounted on any fork with an external diameter of 54 to 58 mm. Thanks to its unique internal mechanism, it intercepts and significantly reduces the stresses the motorcycle transmits to the rider. It works on both the rotary movements of the steering and the pitching movements of the motorcycle. The practical and perceived result is less fatigue in the hands and arms and greater control of the vehicle, especially when braking, entering corners, and going through corners. Compared to traditional rotary or linear hydraulic steering dampers, it introduces the concept of intervention only when necessary, thus ensuring complete freedom of movement at the handlebars in all conditions where agility is required. The TRA4K requires no maintenance; its aluminum structure makes it resistant to any impact; it also features adjustments that allow the intervention threshold to be set based on the type of terrain and discipline (off-road, motard, road).