This week, we capitalize on last week's basics of tire rolling resistance, how it translates to passenger vehicle fuel economy, and non-Newtonian and non-linear nuances. Tires by the Numbers Figure 1 shows the nameplate for one of my tires. Left to right: M+S indicates the tire is suitable for mud and snow. Mud? Don't try it. 225 is the tire width in millimeters, sidewall to sidewall. 225 millimeters is about nine inches. 40 is the sidewall height, from rim to tread, divided by the tire width. 40 means this ratio is 0.4, so that height is 0.4x225 = 90 millimeters.…
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