The 195 refers to millimeters (mm) and is the width of the tire across the treads.
The 55 is also in millimeters(mm) and refers to the height if the tire from the edge of the rim(wheel) to the top of the tire.
And finally, the 15 refers to inches (in) and refers to the diameter of the wheel that the tire fits to and the inside diameter of the tire.
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