Roller-skates/sneakers with separable wheels

Roller-skates/sneakers comprising:

• sneakers comprising an upper side and an inner side and further comprising a tongue firmly connected at the upper side and the inner side at one end, over which laces are laced and connected to the upper side;
• a sole connected to the upper side and the inner side at another end;
• an insole inserted into the sole;
• a rear axle firmly connected to the insole, wherein the rear axle comprises two ends on the same axis;
• a front axle firmly connected to the insole at its other end, wherein the front axle comprises two ends that are moveable from one to the other for a value a and in a plane parallel to the ground;
• a screw, wherein one end of the screw is detachably connected to the front axle, and wherein a pair of wheels are firmly and detachably connected to another end of the screw;
• and wherein the rear axle is in the shape of an elongated cuboid and wherein each end of the two ends of the rear axle comprise a drilled circular hole for accepting a screw.