ShoeGeometry

Adidas Terrex Agravic Speed Ultra 2 vs Nike ACG Ultrafly Trail

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

heel boneAdidas Terrex Agravic Speed Ultra 2: heel 38 mm, forefoot 30 mm (drop 8 mm); toe rocker 43 % of length, radius 54 % of length; heel bevel 15 % of length, 36 mm high at the back, reaching in front of the heel bone (the sole still curves up under it: a heel rocker).Adidas Terrex Agravic Speed Ultra 2: toe rocker 43 % of lengthNike 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 length
  • Adidas Terrex Agravic Speed Ultra 238/30 mm · toe rocker 43 % · heel bevel 15 %
  • Nike ACG Ultrafly Trail38/30 mm · toe rocker 36 % · heel bevel 9 %
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-offAdidas Terrex Agravic Speed Ultra 243.2 vs 36.1 % toe rocker
More cushioning under the heelAbout the same38 vs 38 mm heel stack
More under the forefootAbout the same30 vs 29.5 mm forefoot stack
A lower dropAbout the same8 vs 8.5 mm drop
A stiffer, snappier forefootNike ACG Ultrafly Trail33 vs 46 /100 stiffness
A firmer, more stable feelAbout the same51 vs 42 /100 firmness
A wider base under the forefootAbout the same122.9 vs 124.2 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 Terrex Agravic Speed Ultra 2
Trail · Trail
Nike ACG Ultrafly Trail
Trail · Trail
Heel-to-toe drop8 mmStated8.5 mmStated
Heel stack38 mmStated38 mmStated
Forefoot stack30 mmStated29.5 mmStated
Weight265 gStated267 gStated
Toe rocker43 %est.36 %est.
Rocker radius54 %est.57 %est.
Rocker rise angle27 degest.25 degest.
Rocker angle at toe58 degest.58 degest.
Toe tip over ground53 mm*est.34 mmest.
Visible rocker lift onset73 %est.77.4 %est.
Toe spring (relative)22.1 %est.16.4 %est.
Heel bevel length15.3 %est.9.1 %est.
Heel bevel height36 mm*est.22 mmest.
Midsole width (forefoot)122.9 mmMeasured124.2 mmMeasured
Midsole width (heel)87.6 mmMeasured93.4 mmMeasured
Toe box shape—70 %est.
Interior forefoot width94.4 mmMeasured97.8 mmMeasured
Toebox width69.6 mmMeasured77.2 mmMeasured
Longitudinal stiffness33Derived46Derived
Midsole firmness51Derived42Derived
PlateTPU plateCarbon plate
Primary foamLightstrike ProZoomX (dual density)
List price$225$260

Key differences

  • Heel-to-toe drop is about the same: 8 mm for Adidas Terrex Agravic Speed Ultra 2, 8.5 mm for Nike ACG Ultrafly Trail.
  • Heel stack is about the same: 38 mm for Adidas Terrex Agravic Speed Ultra 2, 38 mm for Nike ACG Ultrafly Trail.
  • Forefoot stack is about the same: 30 mm for Adidas Terrex Agravic Speed Ultra 2, 29.5 mm for Nike ACG Ultrafly Trail.
  • Weight is about the same: 265 g for Adidas Terrex Agravic Speed Ultra 2, 267 g for Nike ACG Ultrafly Trail.
  • Adidas Terrex Agravic Speed Ultra 2's toe rocker is 43 % of length, 7 % of length longer than Nike ACG Ultrafly Trail's 36 % 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 Terrex Agravic Speed Ultra 2

Nike ACG Ultrafly Trail

Independent sites; we are not affiliated with them.

Adidas Terrex Agravic Speed Ultra 2 details · Nike ACG Ultrafly Trail details · Add more shoes