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Each tire has a letter reating to determine the top speed a tire can reach, before losing traction. The chart is as follows: M 81 mph 130 km/h N 87 mph 140 km/h P 93 mph 150 km/h Q 99 mph 160 km/h R 106 mph 170 km/h S 112 mph 180 km/h T 118 mph 190 km/h U 124 mph 200 km/h H 130 mph 210 km/h V 149 mph 240 km/h W 168 mph 270 km/h Y 186 mph 300 km/h
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