ShoeGeometry

Adidas Adizero Boston 13 vs Nike Zoom Fly 6

Two popular shoes in the same category, compared on measured geometry. Each cell carries a provenance badge; open a shoe for sources.

heel boneAdidas Adizero Boston 13: heel 37 mm, forefoot 30 mm (drop 7 mm); toe rocker 37 % of length, radius 41 % of length; heel bevel 5 % of length, 13 mm high at the back, ending behind the heel bone (only the back edge is rounded).Adidas Adizero Boston 13: toe rocker 37 % of lengthNike 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 length
  • Adidas Adizero Boston 1337/30 mm · toe rocker 37 % · heel bevel 5 %
  • Nike Zoom Fly 640/32 mm · toe rocker 41 % · heel bevel 13 %
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 636.7 vs 40.6 % toe rocker
More cushioning under the heelNike Zoom Fly 637 vs 40 mm heel stack
More under the forefootNike Zoom Fly 630 vs 32 mm forefoot stack
A lower dropAdidas Adizero Boston 137 vs 8 mm drop
A stiffer, snappier forefootNike Zoom Fly 639 vs 71 /100 stiffness
A firmer, more stable feelAdidas Adizero Boston 1377 vs 62 /100 firmness
A wider base under the forefootAdidas Adizero Boston 13121 vs 111.9 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.

MetricAdidas Adizero Boston 13
Tempo · Road
Nike Zoom Fly 6
Tempo · Road
Heel-to-toe drop7 mmStated8 mmStated
Heel stack37 mmStated40 mmStated
Forefoot stack30 mmStated32 mmStated
Weight255 gStated265 gStated
Toe rocker37 %est.41 %est.
Rocker radius41 %est.55 %est.
Rocker rise angle28 degest.26 degest.
Rocker angle at toe56 degest.59 degest.
Toe tip over ground45 mm*est.44 mm*est.
Visible rocker lift onset76.6 %est.71.3 %est.
Toe spring (relative)18.8 %est.19.4 %est.
Heel bevel length5.4 %*est.12.8 %*est.
Heel bevel height13 mm*est.16 mm*est.
Midsole width (forefoot)121 mmMeasured111.9 mmMeasured
Midsole width (heel)83.8 mmMeasured87.9 mmMeasured
Toe box shape—75 %*est.
Interior forefoot width97.3 mmMeasured90.9 mmMeasured
Toebox width70.6 mmMeasured72.6 mmMeasured
Longitudinal stiffness39Derived71Derived
Midsole firmness77Derived62Derived
PlatePlate unknownCarbon plate
Primary foamLightstrike ProZoomX + SR-02
List price$160$180

Key differences

  • Adidas Adizero Boston 13's heel-to-toe drop is 7 mm, 1 mm lower than Nike Zoom Fly 6's 8 mm.
  • Adidas Adizero Boston 13's heel stack is 37 mm, 3 mm thinner than Nike Zoom Fly 6's 40 mm.
  • Adidas Adizero Boston 13's forefoot stack is 30 mm, 2 mm thinner than Nike Zoom Fly 6's 32 mm.
  • Adidas Adizero Boston 13's weight is 255 g, 10 g lighter than Nike Zoom Fly 6's 265 g.
  • Adidas Adizero Boston 13's toe rocker is 37 % of length, 4 % of length shorter than Nike Zoom Fly 6's 41 % 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:

Adidas Adizero Boston 13

Nike Zoom Fly 6

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Adidas Adizero Boston 13 details · Nike Zoom Fly 6 details · Add more shoes