ShoeGeometry

Salomon Aero Glide 4 GRVL vs VJ FZN Aerofly

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

heel boneSalomon Aero Glide 4 GRVL: heel 41 mm, forefoot 33 mm (drop 8 mm); toe rocker 31 % of length, radius 39 % of length; heel bevel 7 % of length, 18 mm high at the back, ending behind the heel bone (only the back edge is rounded).Salomon Aero Glide 4 GRVL: toe rocker 31 % of lengthVJ FZN Aerofly: heel 38 mm, forefoot 30 mm (drop 8 mm); toe rocker not measured, typical shape drawn; heel bevel 11 % of length, 21 mm high at the back, ending about under the heel bone.
  • Salomon Aero Glide 4 GRVL41/33 mm · toe rocker 31 % · heel bevel 7 %
  • VJ FZN Aerofly38/30 mm · toe rocker not measured · heel bevel 11 %
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 FZN Aerofly32.9 vs 40.8 mm toe tip
More cushioning under the heelSalomon Aero Glide 4 GRVL41 vs 38 mm heel stack
More under the forefootSalomon Aero Glide 4 GRVL33 vs 30 mm forefoot stack
A lower dropAbout the same8 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.

MetricSalomon Aero Glide 4 GRVL
Road/trail hybrid · Mixed
VJ FZN Aerofly
Road/trail hybrid · Mixed
Heel-to-toe drop8 mmDerived8 mmStated
Heel stack41 mmStated38 mmStated
Forefoot stack33 mmStated30 mmStated
Weight269 gStated245 gStated
Toe rocker31 %est.—
Rocker radius39 %est.—
Rocker rise angle31 degest.—
Rocker angle at toe62 degest.—
Toe tip over ground33 mm*est.41 mm*est.
Visible rocker lift onset77.7 %est.—
Toe spring (relative)18.5 %est.19.4 %est.
Heel bevel length7.5 %est.11.1 %est.
Heel bevel height18 mmest.21 mmest.
Midsole width (forefoot)121.1 mmMeasured—
Midsole width (heel)92.8 mmMeasured—
Interior forefoot width93.7 mmMeasured—
Toebox width71.4 mmMeasured—
Longitudinal stiffness46Derived—
Midsole firmness79Derived—
PlateNo plateRock plate
Primary foamoptiFOAM2 (supercritical), Reverse Camber rockerSuperFOAMance (nitrogen-infused EVA)
List price$160$205

Key differences

  • Heel-to-toe drop is about the same: 8 mm for Salomon Aero Glide 4 GRVL, 8 mm for VJ FZN Aerofly.
  • Salomon Aero Glide 4 GRVL's heel stack is 41 mm, 3 mm thicker than VJ FZN Aerofly's 38 mm.
  • Salomon Aero Glide 4 GRVL's forefoot stack is 33 mm, 3 mm thicker than VJ FZN Aerofly's 30 mm.
  • Salomon Aero Glide 4 GRVL's weight is 269 g, 24 g heavier than VJ FZN Aerofly's 245 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:

Salomon Aero Glide 4 GRVL

VJ FZN Aerofly

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Salomon Aero Glide 4 GRVL details · VJ FZN Aerofly details · Add more shoes