![]() ![]() Measured stack: heel 46mm, forefoot 36mm: apparently 10 mm drop. Update: Please read Derek's Assessment of Shoe Stacks Article here where he measures several super shoes using the IAAF rule parameters. ![]() We shall await the official stack height details from Nike. You can see from the pictures, that the Tempo does have a lower stack than the Alphafly, and at least in the forefoot, the Tempo stack height is about 5mm lower. What you actually land on is where I measured at approximately the same longitudinal location as the spec, a measurement which produces considerably more effective stack at about 50mm for the heel.ĭue to the scalloped designs of both shoes, it is difficult to get an accurate measurement of what the actual stack is, especially with the glued in insole of both shoes. I have no doubt that Nike would have stretched every avenue to get their heel at the 40mm heel limit for the IAAF regulations which call for measuring the heel at 32mm forward of the back inside of the shoe on the center line which would end up being in the quite deep scallop of the sole as shown below. Advertised stacks sometimes deviate quite substantially from the measured stack, and ultimately it only matters how the shoe feels when you run in it. This is of course a considerable deviation from the published stack heights for the Alphafly. Tempo Forefoot 36mm, Heel 46mm for a 10mm dropĪlphafly Forefoot 41mm, Heel 50mm for a 9mm drop ![]() The purpose of the photos is not meant to indicate definitive stack numbers, but more to show that the Alphafly is a little higher stack than the Tempo.īearing in mind that the platform is scalloped in both the forefoot and the heel, and that there is the stack of the sockliner to consider, I measured as follows: Note that both shoes are size men’s US9.5. I received my pair of Alphafly shortly after the Tempo Next% article was published and have since done a re-measurement of the stack heights, and compared the stack of both shoes. ![]()
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