This is my second attempt at this video, because the 'powers that be' didn't like the top I was wearing, so here is version 2.
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Here are a selection of the tyre speed and load indexes.

Speed rating index in mph.
J = 62 / S = 113
K = 69 / T = 118
L = 75 / U = 125
M = 81 / H = 130
N = 87 / V = 150
P = 95 / W = 168
Q = 100 / Y = 186
R = 105 / ZR = 150+


Load index in kgs.
41 = 145 / 51 = 195 / 61 = 257 / 71 = 345
42 = 150 / 52 = 200 / 62 = 265 / 72 = 355
43 = 155 / 53 = 206 / 63 = 272 / 73 = 365
44 = 160 / 54 = 212 / 64 = 280 / 74 = 375
45 = 165 / 55 = 218 / 65 = 290 / 75 = 387
46 = 170 / 56 = 224 / 66 = 300 / 76 = 400
47 = 175 / 57 = 230 / 67 = 307 / 77 = 412
48 = 180 / 58 = 236 / 68 = 315 / 78 = 425
49 = 185 / 59 = 243 / 69 = 325 / 79 = 437
50 = 190 / 60 = 250 / 70 = 335 / 80 = 450