ShoeGeometry

Nike ACG Ultrafly Trail vs VJ Ultra 3

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

heel boneNike ACG Ultrafly Trail: heel 38 mm, forefoot 30 mm (drop 9 mm); toe rocker 36 % of length, radius 57 % of length; heel bevel 9 % of length, 22 mm high at the back, ending behind the heel bone (only the back edge is rounded).Nike ACG Ultrafly Trail: toe rocker 36 % of lengthVJ Ultra 3: heel 38 mm, forefoot 30 mm (drop 8 mm); toe rocker not measured, typical shape drawn; heel bevel 12 % of length, 20 mm high at the back, ending about under the heel bone.
  • Nike ACG Ultrafly Trail38/30 mm · toe rocker 36 % · heel bevel 9 %
  • VJ Ultra 338/30 mm · toe rocker not measured · 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-offVJ Ultra 334.1 vs 41.4 mm toe tip
More cushioning under the heelAbout the same38 vs 38 mm heel stack
More under the forefootAbout the same29.5 vs 30 mm forefoot stack
A lower dropAbout the same8.5 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 ACG Ultrafly Trail
Trail · Trail
VJ Ultra 3
Trail · Trail
Heel-to-toe drop8.5 mmStated8 mmDerived
Heel stack38 mmStated38 mmStated
Forefoot stack29.5 mmStated30 mmStated
Weight267 gStated265 gStated
Toe rocker36 %est.—
Rocker radius57 %est.—
Rocker rise angle25 degest.—
Rocker angle at toe58 degest.—
Toe tip over ground34 mmest.41 mmest.
Visible rocker lift onset77.4 %est.—
Toe spring (relative)16.4 %est.18.4 %est.
Heel bevel length9.1 %est.12.1 %est.
Heel bevel height22 mmest.20 mmest.
Midsole width (forefoot)124.2 mmMeasured—
Midsole width (heel)93.4 mmMeasured—
Toe box shape70 %est.—
Interior forefoot width97.8 mmMeasured—
Toebox width77.2 mmMeasured—
Longitudinal stiffness46Derived—
Midsole firmness42Derived—
PlateCarbon plateRock plate
Primary foamZoomX (dual density)SuperFOAMance (nitrogen-infused supercritical EVA)
List price$260$190

Key differences

  • Heel-to-toe drop is about the same: 8.5 mm for Nike ACG Ultrafly Trail, 8 mm for VJ Ultra 3.
  • Heel stack is about the same: 38 mm for Nike ACG Ultrafly Trail, 38 mm for VJ Ultra 3.
  • Forefoot stack is about the same: 29.5 mm for Nike ACG Ultrafly Trail, 30 mm for VJ Ultra 3.
  • Weight is about the same: 267 g for Nike ACG Ultrafly Trail, 265 g for VJ Ultra 3.

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 ACG Ultrafly Trail

VJ Ultra 3

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Nike ACG Ultrafly Trail details · VJ Ultra 3 details · Add more shoes