1-26-13 TIRE TIP OF THE DAY The sidewall will also have a code indicating the size, plus a load index and a speed index, this information is in metric designations or some tires use letter or inch designations instead of millimeters. The first number is the nominal tread width in millimeters. The second number is the aspect ratio (ratio of tire height to tread width) which is a percentage example: 160/60 meaning the tire height is 60 percent of the tread width, or 96 mm. The “R” means radial-ply construction. The “-” means bias construction. A “B” would mean bias-belted. Next is rim diameter, in inches. The “M/C” means the tire was designed for motorcycles. The next set of characters indicate load index and speed index. The next numbers indicate the maximum load the tire can carry. The next is speed index ratings in letters P=93mph, Q=99mph, R106mph, S=112mph, T=118mph, U=124mph, H=130mph, V=149mph, W=168mph, and (W)=more than 168mph. (At speeds above 130 mph, the maximum permissible load is reduced. Consult tire manufacturer for details. At speeds above 149 mph, the maximum permissible load is reduced. Consult tire manufacturer for details.)
Posted on: Sun, 26 Jan 2014 07:35:39 +0000
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