ShoeGeometry

Nike Zoom Fly 6 vs Saucony Endorphin Speed 6

Two shoes compared on measured geometry. Each cell carries a provenance badge; open a shoe for sources.

heel boneNike Zoom Fly 6: heel 40 mm, forefoot 32 mm (drop 8 mm); toe rocker 41 % of length, radius 55 % of length; heel bevel 13 % of length, 16 mm high at the back, ending about under the heel bone.Nike Zoom Fly 6: toe rocker 41 % of lengthSaucony Endorphin Speed 6: heel 38 mm, forefoot 30 mm (drop 8 mm); toe rocker 31 % of length, radius 35 % of length; heel bevel 17 % of length, 28 mm high at the back, reaching in front of the heel bone (the sole still curves up under it: a heel rocker).Saucony Endorphin Speed 6: toe rocker 31 % of length
  • Nike Zoom Fly 640/32 mm · toe rocker 41 % · heel bevel 13 %
  • Saucony Endorphin Speed 638/30 mm · toe rocker 31 % · heel bevel 17 %
Illustrative profiles, not photographs: drawn from published stack heights and photo estimates of the unloaded shoes on a common length (300 mm), heels aligned, toe to the left; dots mark where each toe rocker starts; the dotted vertical line is under the heel bone (12 % of length), so a heel curve reaching past it is a bevel in front of the heel bone. Dotted lines use typical values where a shoe has no measurement. Exact values are in the table below.

Which suits you

If you wantPickBecause
A smoother roll at toe-offNike Zoom Fly 640.6 vs 31.4 % toe rocker
More cushioning under the heelNike Zoom Fly 640 vs 38 mm heel stack
More under the forefootNike Zoom Fly 632 vs 30 mm forefoot stack
A lower dropAbout the same8 vs 8 mm drop

From the values below, with differences inside measurement noise shown as about the same. This describes the shoes, not what is right for your feet; comfort in the first few runs decides.

MetricNike Zoom Fly 6
Tempo · Road
Saucony Endorphin Speed 6
Tempo · Road
Heel-to-toe drop8 mmStated8 mmStated
Heel stack40 mmStated38 mmStated
Forefoot stack32 mmStated30 mmStated
Weight265 gStated230 gStated
Toe rocker41 %est.31 %est.
Rocker radius55 %est.35 %est.
Rocker rise angle26 degest.31 degest.
Rocker angle at toe59 degest.53 degest.
Toe tip over ground44 mm*est.43 mm*est.
Visible rocker lift onset71.3 %est.79.5 %est.
Toe spring (relative)19.4 %est.19.2 %est.
Heel bevel length12.8 %*est.16.5 %*est.
Heel bevel height16 mm*est.28 mmest.
Midsole width (forefoot)111.9 mmMeasured—
Midsole width (heel)87.9 mmMeasured—
Toe box shape75 %*est.76 %est.
Interior forefoot width90.9 mmMeasured—
Toebox width72.6 mmMeasured—
Longitudinal stiffness71Derived—
Midsole firmness62Derived—
PlateCarbon plateNylon plate
Primary foamZoomX + SR-02PWRRUN PBX (beaded PEBA)
List price$180$180

Key differences

  • Heel-to-toe drop is about the same: 8 mm for Nike Zoom Fly 6, 8 mm for Saucony Endorphin Speed 6.
  • Nike Zoom Fly 6's heel stack is 40 mm, 2 mm thicker than Saucony Endorphin Speed 6's 38 mm.
  • Nike Zoom Fly 6's forefoot stack is 32 mm, 2 mm thicker than Saucony Endorphin Speed 6's 30 mm.
  • Nike Zoom Fly 6's weight is 265 g, 35 g heavier than Saucony Endorphin Speed 6's 230 g.
  • Nike Zoom Fly 6's toe rocker is 41 % of length, 9 % of length longer than Saucony Endorphin Speed 6's 31 % of length.

Read more about both shoes

We measure the shape. For how they feel over many miles, and for lab tests of cushioning, grip and fit:

Nike Zoom Fly 6

Saucony Endorphin Speed 6

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