A sliding ring is mounted on the spline of the main shaft. The sliding ring has conical surfaces on both sides with an inclination and a diameter corresponding to the conical surfaces of the gears. The outer circumferential part of the ring is a wide toothed rim. This rim constantly cooperates with the inner teeth of the outer ring. The outer shift ring is fixed on the shift ring with a ball latch. A groove is made around the circumference of the outer ring, in which the forks of the gearbox control mechanism enter.

By shifting the outer ring to the right - thanks to the latch - the sliding ring is displaced. The cones of the shifting ring and gear are touching, and the friction between them quickly equalizes the rotational speeds of both elements. Further increasing the pressure on the outer ring overcomes the resistance force of the latch and moves the outer ring until it meshes with the toothed rim. This meshing occurs instantaneously, when the shaft with the synchroniser and the gear have the same rotational speed, so it is silent and impact-free.
In practice, slightly more complicated synchronizers are used. A good synchroniser allows smooth gear changes without disengaging the clutch. However, this method of gear shifting is not recommended, because it causes a significant load on the synchronizer components.