Speed Rating Miles/Hour Kilometers/Hour
N 87 140
P 93 150
Q 99 160
R 106 170
S 112 180
T 118 190
Speed Rating Miles/Hour Kilometers/Hour
U 124 200
H 130 210
V 149 240
Z 150+ 240+
W 168 270
Y 186 300
THERE YOU GO M8.................................its the speed rating index,and who sticks to 70,if your theory was right then we would all be going round on N rated tyres,these are guidelines and tyre dealers do not want to be held responsible for tyres letting go after being repaired,personally i dont repair my bike tyres i just buy new if i get a puncture,i do repair them and sell them to my m8 who knows the score i just dont trust repaired tyres at the speeds i do....................