Along with the usual tire specs (width, aspect ratio, rim size - e.g. 205/55R16), our tires also come with load and speed ratings. For my case, it's 91V, meaning each tire could handle 615 kg of load at a speed of 240 KPH.
Other common speed ratings for cars today:
S - 180 KPH (e.g. Mitsubishi Strada GLS Sport V)
T - 190 KPH (e.g. Honda City 1.3S, Hyundai Accent 1.4)
H - 210 KPH (e.g. Ford Explorer LT)
V - 240 KPH (e.g. Toyota Corolla Altis 1.6V/2.0V)
My question is, does it really matter? I ask because there are quite a number of people claiming really high speeds (some with videos and pictures to confirm) with their vehicles, even exceeding the tires' speed rating.
Does it really pose an increased level of danger if you go 10-20 KPH above what your tires are rated at?
Likewise, if your tires are rated at 240 KPH, does it mean that it's relatively safe to go at, say, 210 KPH?