I apologise for using the 'T' word as I know there are many threads on the matter and its testing the patience of some on here. However I have searched here, on Google and looked in the manuals and can't find anywhere the definitive answer to the speed rating required for TR6 tyres. Can someone please point me to where I see for sure the speed rating required? Or were the cars just originally shod with 'H' Rated boots? And would this still be applicable 50 years on? It makes a quite a difference