ShoeGeometry

Nike Streakfly 2 vs VJ Lightspeed 2

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

heel boneNike Streakfly 2: heel 27 mm, forefoot 23 mm (drop 4 mm); toe rocker 35 % of length, radius 38 % of length; heel bevel 8 % of length, 8 mm high at the back, ending behind the heel bone (only the back edge is rounded).Nike Streakfly 2: toe rocker 35 % of lengthVJ Lightspeed 2: heel 29 mm, forefoot 23 mm (drop 6 mm); toe rocker 41 % of length, radius 61 % of length; heel bevel 16 % of length, 26 mm high at the back, reaching in front of the heel bone (the sole still curves up under it: a heel rocker).VJ Lightspeed 2: toe rocker 41 % of length
  • Nike Streakfly 227/23 mm · toe rocker 35 % · heel bevel 8 %
  • VJ Lightspeed 229/23 mm · toe rocker 41 % · heel bevel 16 %
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-offVJ Lightspeed 234.5 vs 41.5 % toe rocker
More cushioning under the heelVJ Lightspeed 227 vs 29 mm heel stack
More under the forefootAbout the same23 vs 23 mm forefoot stack
A lower dropNike Streakfly 24 vs 6 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 Streakfly 2
Racing · Road
VJ Lightspeed 2
Racing · Trail
Heel-to-toe drop4 mmStated6 mmStated
Heel stack27 mmStated29 mmStated
Forefoot stack23 mmStated23 mmStated
Weight145 gStated220 gStated
Toe rocker35 %est.41 %est.
Rocker radius38 %est.61 %est.
Rocker rise angle30 degest.22 degest.
Rocker angle at toe67 degest.—
Toe tip over ground43 mm*est.37 mm*est.
Visible rocker lift onset77.2 %est.—
Toe spring (relative)19.8 %est.—
Heel bevel length8.2 %*est.16 %est.
Heel bevel height8 mm*est.26 mmest.
Midsole width (forefoot)102.2 mmMeasured—
Midsole width (heel)70.8 mmMeasured—
Toe box shape78 %est.—
Interior forefoot width89.7 mmMeasured—
Toebox width66.7 mmMeasured—
Longitudinal stiffness0Derived—
Midsole firmness44Derived—
PlateCarbon platePlate unknown
Primary foamZoomXSuperFOAMance (nitrogen-infused supercritical EVA)
List price$150—

Key differences

  • Nike Streakfly 2's heel-to-toe drop is 4 mm, 2 mm lower than VJ Lightspeed 2's 6 mm.
  • Nike Streakfly 2's heel stack is 27 mm, 2 mm thinner than VJ Lightspeed 2's 29 mm.
  • Forefoot stack is about the same: 23 mm for Nike Streakfly 2, 23 mm for VJ Lightspeed 2.
  • Nike Streakfly 2's weight is 145 g, 75 g lighter than VJ Lightspeed 2's 220 g.
  • Nike Streakfly 2's toe rocker is 35 % of length, 7 % of length shorter than VJ Lightspeed 2'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:

Nike Streakfly 2

VJ Lightspeed 2

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