Which AC was that out of interest Nev?
Speaking of tire limits, I was completely unaware that the C210 tire (may have been just the brand fitted, Goodyear from memory) has a limit of 160kph (86Kn ) until I had to change one a few months back, there isn't anything listed in the POH and I would have exceeded that many times if not every time as I assume it's ground speed and with a high DA and a few KN TW you are well over by VR.