So if I have a tyre rated for 140 km/hr, I wouldn't drive it at that speed under a full load on a hot day without very good life insurance.
And where would you be driving at 140kph for 10 mins, hmm??
Realistically, the OP is talking about the difference between 190 and 210 kph - I doubt you could even find a legal-fitting tyre that would be rated as low as 140kph.
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