Doug Marshall of Crown Point Central School indicates the size information on a tire. He is a junior in Automotive Technologies at CV-TEC Mineville. "A tire's size is a mixture of measurements. The section width is given in millimeters, the aspect ratio is a percent and the rim diameter is given in inches," said Art Miclette, automotive teacher at CV-TEC. As part of the program, students calculate the diameter and circumference of a tire. Students then consider how changing tire size affects the accuracy of the speedometer.