Information provided by Jeff Berton
P = Passenger LT = Light truck T = Temporary LTP = Light truck, personal useWidth:
Width at widest point, sidewall to sidewall, in millimetersAspect Ratio:
Tire height in mm, measured tread to bead, divided by width above, multiplied by one hundred.Speed ratings:
(The maximum speed the tire can maintain at its maximum load rating) Q - 100 mph R - 106 mph S - 112 mph T - 118 mph U - 124 mph H - 130 mph V - 149 mph W - 168 mph Z - more than 168 mphConstruction:
R - Radial ply B - Bias belted D - Diagonal biasSize:
The diameter of the wheel the tire is designed to be mounted on, in inches.Other information:
Maximum Air Pressure - This is the max pressure the tire is designed to hold (note this is more than the recommended inflation pressure) Maximum Load - Weight the tire can support Load Index - A code that indicates the maximum weight the tire can carry at its speed indicated by its speed rating Construction - Tells the number and type of plies used in the construction of the tread and sidewall DOT Serial Number - Identifies the plant, manufacturer, and date of production Tread Wear Index - A rating of the tire's resistance to wear. 100 is the reference. A 250 rating indicates 2.5 times the wear resistance of the reference tire. This number cannot be accurately translated to mileage. Traction Index - A rating of the tire's ability to stop on wet pavement. There are three grades, A, B, and C, with A being the best. This index does not reflect the tire's traction performance on dry, snowy, or icy pavement. Temperature Index - A rating of the tire's ability to dissipate and resist heat. There are three grades, A, B, and C, with A being the best.