S. Canaday wrote:
faster conditions might be on a track or crushed gravel/dirt road. The pounding of the pavement gets pretty bad after40-50 miles and could cost more time than the benefits of better traction/uniform surface.
For sure in a flat 100-miler there would be a very high correlation with marathon PR time and ultra-distance time. A lot less variables that can go exponentially wrong like in a mountain-trail 100-miler.
A lot of the East Africans would clean-up for sure....any guy with a sub 2:12-2:10 PR could be just as good as a 2:04 guy in a 100-miler though.....much like some 2:30 marathon types beat the 2:20 guys sometimes.
realistically I think you'd be looking at maybe something over 9 hrs still....maybe 9:30, but for sure sub 10hrs.
If every marathoner ever could race a 100 at their peak, I’d give the nod to Tsegaye Kebede. He’s not quite that 2:02/2:03 type guy, but his efficiency was superb, he always raced intelligently, and his PR of 2:04 isn’t exactly hurting him. In fact, his worst times were 2:10s in taking 3rd and 4th in Olympics and World Championships. Kebede wouldn’t go out too fast and blow up, and he’d just steadily run through and crush the course. I must disagree that anything under 10 hours is realistic. The 100k world record (6:01 pace) was by 2:10:07 guy Takahiro Sunada (that PR from the same time that he was doing 100ks, so his 100k wasn’t when he was past his marathon prime), and Sunada was absolutely optimized, training wise, for long distance road ultras, with a lot of practice at very fast, very long races. To go sub 10, someone would have to go faster than Sunada’s 100k pace for an extra 38 miles. I think someone like Kebede could about match the pace, as he was legitimately more fit and probably even more efficient, but the idea of going faster is kind of crazy. I feel like your expectations are usually a bit too modest of what marathon guys can do at ultras, but “maybe something over 9 hours still...”? Talking about 9 hours is ridiculous. You really think that the discussion is even worth having regarding someone running 100 miles at nearly 40 seconds per mile faster than the best 100k pace of all time?