ShoeGeometry

Brooks Glycerin 23 vs Salomon Aero Glide 4

Two current shoes in the same category with similar stack height and drop, compared on the values in the database. Each cell carries a provenance badge; open a shoe for sources.

heel boneBrooks Glycerin 23: heel 38 mm, forefoot 30 mm (drop 8 mm); toe rocker 34 % of length, radius 45 % of length; heel bevel 10 % of length, 24 mm high at the back, ending about under the heel bone.Brooks Glycerin 23: toe rocker 34 % of lengthSalomon Aero Glide 4: heel 41 mm, forefoot 33 mm (drop 8 mm); toe rocker 29 % of length, radius 37 % of length; heel bevel 9 % of length, 15 mm high at the back, ending behind the heel bone (only the back edge is rounded).Salomon Aero Glide 4: toe rocker 29 % of length
  • Brooks Glycerin 2338/30 mm · toe rocker 34 % · heel bevel 10 %
  • Salomon Aero Glide 441/33 mm · toe rocker 29 % · 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.
MetricBrooks Glycerin 23
Max cushion · Road
Salomon Aero Glide 4
Max cushion · Road
Heel-to-toe drop8 mmStated8 mmStated
Heel stack38 mmStated41 mmStated
Forefoot stack30 mmStated33 mmStated
Weight301 gStated255 gStated
Toe rocker34 %est.29 %est.
Rocker radius45 %est.37 %est.
Rocker rise angle29 degest.28 degest.
Rocker angle at toe58 degest.61 degest.
Toe tip over ground37 mmest.34 mm*est.
Visible rocker lift onset78.2 %est.80 %est.
Toe spring (relative)17.5 %est.17.1 %est.
Heel bevel length10.3 %est.8.7 %est.
Heel bevel height24 mm*est.15 mmest.
Midsole width (forefoot)120.4 mmMeasured121.7 mmMeasured
Midsole width (heel)98.6 mmMeasured94.2 mmMeasured
Toe box shape75 %*est.—
Interior forefoot width96.1 mmMeasured95.7 mmMeasured
Toebox width73.9 mmMeasured71.2 mmMeasured
Longitudinal stiffness38Derived54Derived
Midsole firmness33Derived70Derived
PlateNo plateNo plate
Primary foamDNA TunedoptiFOAM2 (supercritical), Reverse Camber rocker
List price$175$160

Key differences

  • Heel-to-toe drop is about the same: 8 mm for Brooks Glycerin 23, 8 mm for Salomon Aero Glide 4.
  • Brooks Glycerin 23's heel stack is 38 mm, 3 mm thinner than Salomon Aero Glide 4's 41 mm.
  • Brooks Glycerin 23's forefoot stack is 30 mm, 3 mm thinner than Salomon Aero Glide 4's 33 mm.
  • Brooks Glycerin 23's weight is 301 g, 46 g heavier than Salomon Aero Glide 4's 255 g.
  • Brooks Glycerin 23's toe rocker is 34 % of length, 5 % of length longer than Salomon Aero Glide 4's 29 % of length.

Brooks Glycerin 23 details · Salomon Aero Glide 4 details · Add more shoes