Alright, so I have received confirmation from Track Shack on the new POT cutoffs for the HM. They have also confirmed this will be the new standard moving forward for all HMs not just Wine and Dine 2020. They didn't mention anything about the M POT because I didn't ask them about it.
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The new cutoffs for a 2:30 HM are:
10k - 1:08
12k - 1:23
15k - 1:45
10mi - 1:54
M - 5:27 (although I didn't list this one in the graph)
As is the standard addendum with this chart above, these are best guess extrapolations based on math and are by no means official. They're a good measure to judge by though for corral placement.
Both the choice of 10 miler cutoff and M cutoff show a distinct advantage to submitting a time from either of those categories instead of the 10k, 12k, or 15k time.
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The chart above is a reverse calculation of the classic Riegel formula. My goal was to determine the R-value being used for each of the distances. In the past, I've estimated the Riegel R-value to be 1.055 for the HM POT conversions. The 10k, 12k, and 15k values are very close to that and well within rounding margins. But the 10 miler and M are distinctly different. For instance in a 10 miler, the normal 1.060 R-value like the 10k uses would say you would need a 1:52:35 10 miler for a 2:30 HM equivalent. But using the 1.014 value means a 1:54:00 converts to a 2:30 HM. So the 10 miler and M conversions are more generous. This was true with the old set of data, but not by as much.