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The letters are indicative of the tires speed rating.
I'm not sure exactly what a Z rated tire it rated to, but google is your friend ;P
A speed rating means the maximum speed that the tire was engineered for.
Operating a vehicle over this maximum is highly unsafe, as the tires were not designed for the added stress, and could result in injury or death.
 

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Speed rating[18]
Code mph km/h Code mph km/h
A1 3 5 L 75 120
A2 6 10 M 81 130
A3 9 15 N 87 140
A4 12 20 P 94 150
A5 16 25 Q 100 160
A6 19 30 R 106 170
A7 22 35 S 112 180
A8 25 40 T 118 190
B 31 50 U 124 200
C 37 60 H 130 210
D 40 65 V 149 240
E 43 70 Z over 149 over 240
F 50 80 W 168 270
G 56 90 (W) over 168 over 270
J 62 100 Y 186 300
K 68 110 (Y) over 186 over 300
 
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