ShoeGeometry

Inov-8 Trailfly Pro vs New Balance FuelCell Rebel Trail

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

heel boneInov-8 Trailfly Pro: heel 34 mm, forefoot 28 mm (drop 6 mm); toe rocker not measured yet (visible lift over the front 23 % of length), typical shape drawn; heel bevel 9 % of length (height not measured), ending behind the heel bone (only the back edge is rounded).New Balance FuelCell Rebel Trail: heel 33 mm, forefoot 27 mm (drop 6 mm); toe rocker 35 % of length, radius 47 % of length; heel bevel 6 % of length, 6 mm high at the back, ending behind the heel bone (only the back edge is rounded).New Balance FuelCell Rebel Trail: toe rocker 35 % of length
  • Inov-8 Trailfly Pro34/28 mm · toe rocker not measured · heel bevel 9 %
  • New Balance FuelCell Rebel Trail33/27 mm · toe rocker 35 % · heel bevel 6 %
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-offNew Balance FuelCell Rebel Trail31.2 vs 38 mm toe tip
More cushioning under the heelAbout the same34 vs 33 mm heel stack
More under the forefootAbout the same28 vs 27 mm forefoot stack
A lower dropAbout the same6 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.

MetricInov-8 Trailfly Pro
Trail · Trail
New Balance FuelCell Rebel Trail
Trail · Trail
Heel-to-toe drop6 mmStated6 mmStated
Heel stack34 mmStated33 mmStated
Forefoot stack28 mmStated27 mmStated
Weight227 gStated289 gStated
Toe rocker—35 %est.
Rocker radius—47 %est.
Rocker rise angle—29 degest.
Rocker angle at toe—67 degest.
Toe tip over ground31 mm*est.38 mmest.
Visible rocker lift onset77.2 %est.76.1 %est.
Toe spring (relative)—19.5 %est.
Heel bevel length9.3 %est.6.4 %est.
Heel bevel height—6 mmest.
PlateNo plateNo plate
Primary foamPOWERFLOW Elite (supercritical TPEE)FuelCell (injection-moulded)
List price$195$150

Key differences

  • Heel-to-toe drop is about the same: 6 mm for Inov-8 Trailfly Pro, 6 mm for New Balance FuelCell Rebel Trail.
  • Inov-8 Trailfly Pro's heel stack is 34 mm, 1 mm thicker than New Balance FuelCell Rebel Trail's 33 mm.
  • Inov-8 Trailfly Pro's forefoot stack is 28 mm, 1 mm thicker than New Balance FuelCell Rebel Trail's 27 mm.
  • Inov-8 Trailfly Pro's weight is 227 g, 62 g lighter than New Balance FuelCell Rebel Trail's 289 g.

Inov-8 Trailfly Pro details · New Balance FuelCell Rebel Trail details · Add more shoes