ShoeGeometry

Nike Zoom Fly 6 vs Saucony Kinvara 16

Two popular shoes in the same category, 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 Kinvara 16: heel 28 mm, forefoot 24 mm (drop 4 mm); toe rocker 34 % of length, radius 44 % of length; heel bevel 12 % of length, 20 mm high at the back, ending about under the heel bone.Saucony Kinvara 16: toe rocker 34 % of length
  • Nike Zoom Fly 640/32 mm · toe rocker 41 % · heel bevel 13 %
  • Saucony Kinvara 1628/24 mm · toe rocker 34 % · heel bevel 12 %
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 34.1 % toe rocker
More cushioning under the heelNike Zoom Fly 640 vs 28 mm heel stack
More under the forefootNike Zoom Fly 632 vs 24 mm forefoot stack
A lower dropSaucony Kinvara 168 vs 4 mm drop
A stiffer, snappier forefootNike Zoom Fly 671 vs 21 /100 stiffness
A wider base under the forefootAbout the same111.9 vs 113.8 mm forefoot base

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 Kinvara 16
Tempo · Road
Heel-to-toe drop8 mmStated4 mmStated
Heel stack40 mmStated28 mmStated
Forefoot stack32 mmStated24 mmStated
Weight265 gStated207 gStated
Toe rocker41 %est.34 %est.
Rocker radius55 %est.44 %est.
Rocker rise angle26 degest.25 degest.
Rocker angle at toe59 degest.57 degest.
Toe tip over ground44 mm*est.36 mm*est.
Visible rocker lift onset71.3 %est.78.9 %est.
Toe spring (relative)19.4 %est.15.8 %est.
Heel bevel length12.8 %*est.12.1 %*est.
Heel bevel height16 mm*est.20 mm*est.
Midsole width (forefoot)111.9 mmMeasured113.8 mmMeasured
Midsole width (heel)87.9 mmMeasured86.5 mmMeasured
Toe box shape75 %*est.73 %*est.
Interior forefoot width90.9 mmMeasured94 mmMeasured
Toebox width72.6 mmMeasured70.8 mmMeasured
Longitudinal stiffness71Derived21Derived
Midsole firmness62Derived—
PlateCarbon plateNo plate
Primary foamZoomX + SR-02PWRRUN
List price$180$130

Key differences

  • Nike Zoom Fly 6's heel-to-toe drop is 8 mm, 4 mm higher than Saucony Kinvara 16's 4 mm.
  • Nike Zoom Fly 6's heel stack is 40 mm, 12 mm thicker than Saucony Kinvara 16's 28 mm.
  • Nike Zoom Fly 6's forefoot stack is 32 mm, 8 mm thicker than Saucony Kinvara 16's 24 mm.
  • Nike Zoom Fly 6's weight is 265 g, 58 g heavier than Saucony Kinvara 16's 207 g.
  • Nike Zoom Fly 6's toe rocker is 41 % of length, 6 % of length longer than Saucony Kinvara 16's 34 % 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 Kinvara 16

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Nike Zoom Fly 6 details · Saucony Kinvara 16 details · Add more shoes