For example, a tire graded 200 would wear twice as well on the course as a tire graded 100. The rating increases in 20-point increments. It is important to note that the true performance of a tire depends upon the actual conditions of its use.
195 is the width of the tire in millimeters. 60 is the "aspect ratio" - the ratio of the height of the sidewall to the width, expressed as a percentage. R Means the tire has radial construction; 15 represents the wheel diameter in inches. 87 is the load index. Q is the speed rating.