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What do the letters h r v y w z mean on tyres?

H - Higher load-carrying capacity

R - Radial construction

V - Speed, which is up to 240 km/h (149 mph)

Y - Speed, which is up to 300 km/h (186 mph)

W - Speed, which is up to 270 km/h (168 mph)

Z - Speed, which is over 240 km/h (149 mph)