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 close the plastic wave 
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Зарегистрирован: Чт ноя 16, 2017 8:33
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Сообщение close the plastic wave
When you compare the back half of the Sayonara to the back half of the NB 1400v2 (see photos below), two big differences jump out. First, the Sayonaras have a massive plastic heel counter, whereas the 1400’s have no heel counter. Second, the Sayonara has a hard plastic “wave plate” that extends from the back of the heel to the midfoot, the 1400’s have only a plastic shank that begins at the front of the heel and ends at the back of the forefoot. The 1400 shank is also narrow, and it does not extend to the inner and outer Adidas Superstar Womens Pink margins of the sole – the purpose is presumably to add a bit of longitudinal stiffness since the shoe is built for racing and speed. I’m not sure what the intended purpose of the wave plate in the Sayonara is.

The wave plate in the Sayonara makes the back half of the shoe very rigid, with very little flexibility in any plane, but in particular it lacks torsional (twisting) and mediolateral flexibility. The heel counter really locks the back half of the foot in place. Why is this a problem for me? Here’s what I think.

I’m usually a midfoot to mild heel striker in cushioned shoes, so I tend to land with either most of the outer edge of the shoe contacting, or at a point somewhere between the posterolateral corner of the heel and the midpoint of the arch. The problem with this Nike Air Presto Femme is that I am contacting along the outer edge with essentially Nike Air Max 90 Damen Schwarz very little cushion between my foot and a big sheet of hard plastic, and this creates a fairly rigid lever that forces my foot to torque very rapidly at contact. You can see how close the plastic wave plate comes to the base of the midsole under the midfoot in the photo below – pretty darn close to where my center of pressure at contact is located (I had this measured earlier this year on a force treadmill)My hypothesis is supported by what I feel running in the shoes – they feel jerky and slappy, not smooth. It’s kind of like what I’d image running in a dress shoe with a hard rubber heel would feel like. I can adapt my stride to make them more comfortable, but not sure I want to do that (more on this below).

In contrast to the Sayonara, the NB 1400v2 is torsionally Adidas Superstar Femme Fleur more flexible, and the sole is much softer under my contact Adidas Stan Smith Dames zone. As such, when I contact the midsole compresses, there is a bit of flex, and the transition into pronation is much smoother and not as rapid. I feel none of the Sayonara induced jerkiness in the 1400, even though the sole dimensions are so similar.

Пн окт 08, 2018 7:31
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