ShoeGeometry

Inov-8 Trailfly V2 vs NNormal Kjerag 02

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

heel boneInov-8 Trailfly V2: heel 28 mm, forefoot 22 mm (drop 6 mm); toe rocker 33 % of length, radius 53 % of length; heel bevel 5 % of length (height not measured), ending behind the heel bone (only the back edge is rounded).Inov-8 Trailfly V2: toe rocker 33 % of lengthNNormal Kjerag 02: heel 26 mm, forefoot 20 mm (drop 6 mm); toe rocker not measured, typical shape drawn.
  • Inov-8 Trailfly V228/22 mm · toe rocker 33 % · heel bevel 5 %
  • NNormal Kjerag 0226/20 mm · toe rocker not measured
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-offNNormal Kjerag 0228.4 vs 38.6 mm toe tip
More cushioning under the heelInov-8 Trailfly V228 vs 26 mm heel stack
More under the forefootInov-8 Trailfly V222 vs 20 mm forefoot stack
A lower dropAbout the same6 vs 6 mm drop
Less weightNNormal Kjerag 02303 vs 230 g

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.

MetricInov-8 Trailfly V2
Trail · Trail
NNormal Kjerag 02
Trail · Trail
Heel-to-toe drop6 mmStated6 mmStated
Heel stack28 mmStated26 mmStated
Forefoot stack22 mmStated20 mmStated
Weight303 gStated230 gStated
Toe rocker33 %est.—
Rocker radius53 %est.—
Rocker rise angle24 degest.—
Toe tip over ground28 mmest.39 mmest.
Visible rocker lift onset80 %est.—
Toe spring (relative)—16.5 %est.
Heel bevel length5.1 %est.—
Midsole width (forefoot)111 mmMeasured—
Midsole width (heel)83.3 mmMeasured—
Interior forefoot width98.8 mmMeasured—
Toebox width80 mmMeasured—
Longitudinal stiffness22Derived—
Midsole firmness75Derived—
PlateNo plateNo plate
Primary foamPOWERFLOW ProEExpure+ (supercritical TPEE)
List price$160$215

Key differences

  • Heel-to-toe drop is about the same: 6 mm for Inov-8 Trailfly V2, 6 mm for NNormal Kjerag 02.
  • Inov-8 Trailfly V2's heel stack is 28 mm, 2 mm thicker than NNormal Kjerag 02's 26 mm.
  • Inov-8 Trailfly V2's forefoot stack is 22 mm, 2 mm thicker than NNormal Kjerag 02's 20 mm.
  • Inov-8 Trailfly V2's weight is 303 g, 73 g heavier than NNormal Kjerag 02's 230 g.

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:

Inov-8 Trailfly V2

NNormal Kjerag 02

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Inov-8 Trailfly V2 details · NNormal Kjerag 02 details · Add more shoes