ShoeGeometry

Nike Alphafly 4 vs Nike Alphafly 3

What changed from the Nike Alphafly 3: weight lighter, rocker rise angle flatter, rocker apex starts earlier. Each cell carries a provenance badge; open a shoe for sources.

Nike Alphafly 4: heel 39 mm, forefoot 31 mm (drop 8 mm); rocker apex 64 % of length, radius 43 % of length.Nike Alphafly 4: rocker apex at 64 % of lengthNike Alphafly 3: heel 40 mm, forefoot 32 mm (drop 8 mm); rocker apex 67 % of length, radius 43 % of length.Nike Alphafly 3: rocker apex at 67 % of length
  • Nike Alphafly 439/31 mm · apex 64 %
  • Nike Alphafly 340/32 mm · apex 67 %
Midsoles drawn from measured values on a common length (290 mm), heels aligned, toe to the left; dots mark the rocker apex. Dotted lines use typical values where a shoe has no measurement. Exact values are in the table below.

What changed

MeasureNike Alphafly 3Nike Alphafly 4Change
Heel stack40 mm39 mmlower (−1 mm)
Forefoot stack32 mm31 mmlower (−1 mm)
Drop8 mm8 mmabout the same
Weight218 g188 glighter (−30 g)
Rocker apex66.7% of length64.5% of lengthstarts earlier (−2.2 %)
Toe tip over ground37.5 mm40.8 mmhigher (+3.3 mm)
Rocker rise angle28.4°24.8°flatter (−3.6)

Compared with the previous version in this catalogue. Differences within measurement noise are shown as about the same. All version changes

MetricNike Alphafly 4
Racing · Road
Nike Alphafly 3
Racing · Road
Heel-to-toe drop8 mmStated8 mmStated
Heel stack39 mmStated40 mmStated
Forefoot stack31 mmStated32 mmStated
Weight188 gStated218 gStated
Rocker apex64.5 %est.66.7 %est.
Rocker radius43 %est.43 %est.
Rocker rise angle25 degest.28 degest.
Toe tip over ground41 mmest.38 mmest.
Rocker angle at toe44 degest.58 degest.
Visible rocker lift onset76.7 %est.76.2 %est.
Toe spring (relative)16.4 %est.19.4 %est.
Midsole width (forefoot)—117.5 mmMeasured
Midsole width (heel)—91.9 mmMeasured
Interior forefoot width—93.3 mmMeasured
Toebox width—75.3 mmMeasured
Longitudinal stiffness—100Derived
Midsole firmness—54Derived
PlateCarbon plateCarbon plate
Primary foamZoomX + Air Zoom unitsZoomX + Air Zoom units
List price$280$285

Key differences

  • Heel-to-toe drop is about the same: 8 mm for Nike Alphafly 4, 8 mm for Nike Alphafly 3.
  • Nike Alphafly 4's heel stack is 39 mm, 1 mm thinner than Nike Alphafly 3's 40 mm.
  • Nike Alphafly 4's forefoot stack is 31 mm, 1 mm thinner than Nike Alphafly 3's 32 mm.
  • Nike Alphafly 4's weight is 188 g, 30 g lighter than Nike Alphafly 3's 218 g.
  • Rocker onset is about the same: 77 % of length for Nike Alphafly 4, 76 % of length for Nike Alphafly 3.

Nike Alphafly 4 details · Nike Alphafly 3 details · Add more shoes