ShoeGeometry

Inov-8 Trailfly V2

TrailTrailNo plate2026Men'sCurrent

At a glance

Heel-to-toe drop
6 mmStated
Stack, heel / forefoot
28 / 22 mmStated
Weight
303 gStatedUS M9
Plate
No plate
Toe rocker
33 % of lengthest.photos 32–34 %
Heel bevel
5.1 % of lengthest.rough estimate; photos 4–6 %
Stiffness / firmness
22 / 75 of 100Derived
Primary foam
POWERFLOW Pro

How it compares

  • Inov-8 Trailfly V2's heel-to-toe drop is 6 mm, about the catalogue median of 6 mm (25% of the 179 other current shoes are lower).
  • Inov-8 Trailfly V2's heel stack is 28 mm, thinner than the catalogue median of 38 mm (3% of the 176 other current shoes are thinner).
  • Inov-8 Trailfly V2's forefoot stack is 22 mm, thinner than the catalogue median of 31.5 mm (2% of the 171 other current shoes are thinner).
  • Inov-8 Trailfly V2's weight is 303 g, heavier than the catalogue median of 269 g (87% of the 167 other current shoes are lighter).
  • 4 shoes with similar geometry from other lines.

Differences smaller than the precision of the sources (about 1 mm of stack, 8 g, or the spread between photos for photo estimates) are reported as about the same.

Specifications

Heel-to-toe drop
Manufacturer stated
6mm
LowSpec listingbrand figure, reported by Believe in the Runsource
Heel stack
Manufacturer stated
28mm
LowSpec listingbrand figure, reported by Believe in the Runsource
Forefoot stack
Manufacturer stated
22mm
LowSpec listingbrand figure, reported by Believe in the Runsource
Weight
Manufacturer stated
303g
MediumSpec listingbrand figure, reported by Believe in the RunUS M9source
Plate
No plate
Primary foam
POWERFLOW Pro
List price
$160

Geometry

Catalogue average: heel 38 mm, forefoot 32 mm, toe rocker 35 %Inov-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).28 mm22 mmUnder the centre of the heel bone: 12 % of length from the heel, where heel stack is measuredheel boneHeel contact: the sole is within 4.5 mm of the ground from 5 % of length (foam compresses more under load), ending behind the heel bone (only the back edge is rounded)heel bevel 5 %Toe rocker: the front 33 % of the length curves up (the curve leaves the ground 67 % of length from the heel)toe rocker 33 %toeheel
Front: toe rocker shorter longerRear: heel stack lower higher not measured
Dashed: average of the catalogue
  • Heel bevel height not measured: typical height drawn
Illustrative profile, not a photograph or scan: drawn to scale for a 300 mm shoe from published stack heights and photo estimates of the unloaded shoe (under body weight the foam compresses and the curves flatten). The grey upper is a generic outline, not this shoe’s. Inov-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). Heel bone: 12 % of length from the heel, where heel stack is measured. Heel bevel and toe rocker are marked where each curve meets the ground; for the heel that is where the sole comes within 4.5 mm of the ground, which foam compression closes under body weight. The bevel height is drawn from a typical value: the photos traced the heel counter, not the sole.

Percent values are relative to shoe length so they compare across images and sizes; widths in millimetres are lab measurements from the cited source, while toe tip and heel heights in millimetres are photo estimates converted for a men’s US 9 (assumed 300 mm long), so approximate. See how rocker geometry is defined.

Toe rocker
AI estimated
33%

2 photos range 32–34 %; shown is their median.

LowSide photosource
Rocker radius
AI estimated
53%

2 photos range 51–53 %; shown is one of the two that agree most closely.

LowSide photosource
Rocker rise angle
AI estimated
24deg

2 photos range 23–25 deg; shown is their median.

LowSide photosource
Toe tip over ground
AI estimated
28mm

2 photos range 27–29 mm; shown is their median.

LowSide photosource
Visible rocker lift onset
AI estimated
80%

2 photos range 80–80.8 %; shown is one of the two that agree most closely.

LowSide photosource
Heel bevel length
AI estimated
5.1%

2 photos range 3.8–6.4 %; shown is the average of the two that agree most closely.

LowSide photosource
Midsole width (forefoot)
Externally measured
111mm
MediumLab testsource
Midsole width (heel)
Externally measured
83.3mm
MediumLab testsource
Interior forefoot width
Externally measured
98.8mm
MediumLab testsource
Toebox width
Externally measured
80mm
MediumLab testsource

Stiffness

Longitudinal stiffness
Derived
22/ 100

Lab reading: 12.3 N, force to bend the shoe 30° (lab bending test); the score is our 0–100 rescaling of it.

MediumLab flex testsource
Midsole firmness
Derived
75/ 100

Lab reading: 39.9 Asker C, midsole durometer reading (higher = firmer); the score is our 0–100 rescaling of it.

MediumLab durometersource
Wrong value? Missing data? Tell me
Stored only to improve the site; see privacy.

Sources

  • The Inov8 Trailfly v2 Has Great Graphene Grip, But Is That Enough? | Believe in the RunreviewBelieve in the Runaccessed 2026-10-04open ↗
  • inov-8-trailfly-v2 lateral product photoimageZapposaccessed 2026-10-04open ↗
  • inov-8-trailfly-v2 lateral product photoimageZapposaccessed 2026-10-04open ↗
  • Cut in half: Inov8 Trailfly v2 Review (2026) | RunRepeatlabRunRepeataccessed 2026-10-04open ↗
Technical detail: every recorded value, method and version (22)

All approved observations

Every recorded value, including superseded ones. The displayed value per metric is chosen by precedence (measured › stated › derived › AI estimated), then confidence, then recency. 24 further observations awaiting review.

MetricValueClassConfidenceMethodSourceRecorded
Heel-to-toe drop6 mmStatedLowSpec listingBelieve in the Run2026-10-04
Heel stack28 mmStatedLowSpec listingBelieve in the Run2026-10-04
Forefoot stack22 mmStatedLowSpec listingBelieve in the Run2026-10-04
Weight303 g (US M9)StatedMediumSpec listingBelieve in the Run2026-10-04
Rocker apex66 %est.LowSide photoZappos2026-10-04
Rocker apex67.8 %est.LowSide photoZappos2026-10-04
Rocker radius51 %est.LowSide photoZappos2026-10-04
Rocker radius53 %est.LowSide photoZappos2026-10-04
Rocker rise angle25 degest.LowSide photoZappos2026-10-04
Rocker rise angle23 degest.LowSide photoZappos2026-10-04
Toe tip over ground27 mmest.LowSide photoZappos2026-10-04
Toe tip over ground29 mmest.LowSide photoZappos2026-10-04
Visible rocker lift onset80.8 %est.LowSide photoZappos2026-10-04
Visible rocker lift onset80 %est.LowSide photoZappos2026-10-04
Heel bevel length3.8 %est.LowSide photoZappos2026-10-04
Heel bevel length6.4 %est.LowSide photoZappos2026-10-04
Midsole width (forefoot)111 mmMeasuredMediumLab testRunRepeat2026-10-04
Midsole width (heel)83.3 mmMeasuredMediumLab testRunRepeat2026-10-04
Interior forefoot width98.8 mmMeasuredMediumLab testRunRepeat2026-10-04
Toebox width80 mmMeasuredMediumLab testRunRepeat2026-10-04
Longitudinal stiffness22 DerivedMediumLab flex testRunRepeat2026-10-04
Midsole firmness75 DerivedMediumLab durometerRunRepeat2026-10-04

Classes: Manufacturer stated · Externally measured · AI estimated · Derived · User reported. Hover a method for its identifier and algorithm version.

Source notes

  • Zappos: sha256=8de66bdeaf3caea01b0628c40f1df7744a1b13c9bb20f781f2fadbc13c611cce; 0.3
  • Zappos: sha256=0512913be187521015664d04320750f0583e93b8c49d59a298c1b0ba52b04747; 0.3

Shoes with similar geometry

Compare these →

Closest current models from other lines by stack, drop, rocker, toe height, stiffness, firmness, weight and width, whichever both shoes have.

Side profile illustration of the Salomon Pulsar
Salomon
Pulsar
Trail · No plate
Drop
6 mm
Heel
29 mm
Toe rocker
32%

Very close on every shared measure

Side profile illustration of the Merrell MTL SpeedArc Peak
Merrell
MTL SpeedArc Peak
Racing · Carbon plate
Drop
6 mm
Heel
— mm
Toe rocker
35%

vs this shoe: stiffer · softer foam

Side profile illustration of the Merrell Nova 4
Merrell
Nova 4
Trail · No plate
Drop
8 mm
Heel
29 mm
Toe rocker
36%

vs this shoe: 7 mm wider base · 2 mm more drop

Side profile illustration of the Nike Kiger 10
Nike
Kiger 10
Trail · Rock plate
Drop
5 mm
Heel
29 mm
Toe rocker
28%

vs this shoe: 27 g lighter