oldbobcat said:
That will have been six years ago.
Excellent point.
While winning 7 TdF's is no small achievement, it also has acknowledged that the TdF isn't a sporting event for individuals. At least in the last 20+ years, winning has required the help of the rest of a rider's team. It's a mistake to say that a rider won by his sheer physical prowess. Without the team, the rider wouldn't be there. There have been quite a few riders who won who weren't the strongest rider in the Tour.
The Ironman isn't a team sport, obviously. Moreover the Ironman, IMHO, requires a physical effort that isn't required in the TdF. The triathletes at Kona ride nearly a Grand Tour stage distance. Then on top of that, they swim a few miles, and have to endure the pounding of running a marathon distance. Perhaps the older TdF's, when Desgrange was still around imagining ways to break men, were comparable given their sometimes huge distances, bad mountain roads, and the unavailability of 10 speed cassettes.
Armstrong also won't have runners there soley to pace him, as he did in the NY Marathon.
I'm sure he can and, if he does race there, will complete the course. The way things look right now, though, he won't be winning.