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Brooks Glycerin Flex vs Glycerin 23

Which Running Shoe Is Better?

    Top
    Main Differences
    Design
      WeightStack HeightsExternal ShapeInternal ShapeForefoot Fit: WidthForefoot Fit: HeightArch Fit: WidthLength FitOther Features
    Performance
      Heel Energy ReturnForefoot Energy ReturnHeel CushioningForefoot CushioningHeel FirmnessForefoot FirmnessForefoot Long Run Cushioning
    Comments

Products

Brooks Glycerin Flex
Brooks Glycerin 23 
early access

Tested using Methodology v0.10

Updated Mar 24, 2026 01:27 PM

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Amazon.com

Tested using Methodology v0.10

Updated Mar 19, 2026 03:04 PM

This review is in Early access

SEE PRICE
Amazon.com
Brooks Glycerin Flex Picture

Track

Brooks Glycerin 23 Picture

Track

Weight
262.7 g (9.26 oz)
Heel-To-Toe Drop
10.9 mm
Plate
None
Weight
299.4 g (10.56 oz)
Heel-To-Toe Drop
9.6 mm
Plate
None

Our Verdict

Brooks Glycerin Flex

Brooks Glycerin 23

Full comparison details regarding individual product score sets can be found in the section below

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Variants

  • Glycerin Flex (Black/White - (Women - US 7))
  • Glycerin Flex (Coconut/Chateau/Portabella - (Women - US 7))
  • Glycerin 23 (Atlantic Deep/Greymist/Coconut - (Men - US 9))
  • Glycerin 23 (Black/Black/Ebony - (Men - US 9))

Review

See Brooks Glycerin Flex Review
See Brooks Glycerin 23 Review
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Check Price

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Brooks
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Main Differences for
Marathon Racing

Threshold 

0.10

Marathon Racing 
 

4.5
0.0
No major differences between these running shoes for marathon racing. See full list of tests below.

Full Comparison

Design

Weight  

5.9
N/A

Right Shoe Weight Photo  

Compare High-Res
Brooks Glycerin Flex Right Shoe Weight Photo
Brooks Glycerin 23 Right Shoe Weight Photo Sample

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Left Shoe Weight Photo  

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Brooks Glycerin Flex Left Shoe Weight Photo
Brooks Glycerin 23 Left Shoe Weight Photo Sample

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Weight 
 

262.7 g (9.26 oz)
Lock g (Lock oz)

Stack Heights 
 

Stack Height Photo  

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Brooks Glycerin Flex Stack Height Photo
Brooks Glycerin 23 Stack Height Photo Sample

SAMPLE

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Heel Stack Height 
 

36.6 mm
Lock mm

Forefoot Stack Height 
 

25.7 mm
Lock mm

Heel-To-Toe Drop 
 

10.9 mm
Lock mm

Advertised Heel-To-Toe Drop 
 

6.0 mm
Lock mm

External Shape 
 

3D Model Full Shoe  

Preview 3D
Brooks Glycerin Flex 3D Model Full Shoe
Brooks Glycerin 23 3D Model Full Shoe Sample

SAMPLE

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Outsole Heel Width 
 

91 mm (3.6")
Lock mm (Lock")

Outsole Arch Width 
 

85 mm (3.4")
Lock mm (Lock")

Outsole Forefoot Width 
 

113 mm (4.5")
Lock mm (Lock")

Heel Width-To-Stack Ratio 
 

2.49
Lock

Forefoot Width-To-Stack Ratio 
 

4.39
Lock

Internal Shape 
 

3D Model Internal  

Preview 3D
Brooks Glycerin Flex 3D Model Internal
Brooks Glycerin 23 3D Model Internal Sample

SAMPLE

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Internal Length 
 

281 mm (11.1")
Lock mm (Lock")

Internal Heel Width 
 

66 mm (2.6")
Lock mm (Lock")

Internal Forefoot Width 
 

95 mm (3.7")
Lock mm (Lock")

Wide Sizing Available 
 

No
Locked

Forefoot Fit: Width 
 

9.7
N/A

Forefoot Width Photo  

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Brooks Glycerin Flex Forefoot Width Photo
Brooks Glycerin 23 Forefoot Width Photo Sample

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Ball-Of-Foot TTS Deviation 
 

1.7 mm (0.066")
Lock mm (Lock")

Toe TTS Deviation 
 

1.5 mm (0.058")
Lock mm (Lock")

Forefoot Fit: Height 
 

9.8
N/A

Forefoot Height Photo  

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Brooks Glycerin Flex Forefoot Height Photo
Brooks Glycerin 23 Forefoot Height Photo Sample

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Toe TTS Deviation 
 

-0.7 mm (-0.028")
Lock mm (Lock")

Arch Fit: Width 
 

6.4
N/A

Arch Fit Photo  

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Brooks Glycerin Flex Arch Fit Photo
Brooks Glycerin 23 Arch Fit Photo Sample

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Arch Width TTS Deviation 
 

-5.3 mm (-0.209")
Lock mm (Lock")

Length Fit 
 

10
N/A

Toe Clearance Photo  

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Brooks Glycerin Flex Toe Clearance Photo
Brooks Glycerin 23 Toe Clearance Photo Sample

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Other Features  

Other Features Photo  

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Brooks Glycerin Flex Other Features Photo
Brooks Glycerin 23 Other Features Photo Sample

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Tongue Gusset Type 
 

Non-gusseted
Locked

Plate 
 

None
Locked
Performance

Heel Energy Return 
 

0.7
N/A

Heel Compression Video  

Brooks Glycerin 23 Heel Compression Video Sample

SAMPLE

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Heel Energy Return  

 Preview Graph
Brooks Glycerin Flex Heel Energy Return
Brooks Glycerin 23 Heel Energy Return Sample

SAMPLE

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Heel Energy Return 
 

62.4%
Lock%

Forefoot Energy Return 
 

1.6
N/A

Forefoot Compression Video  

Brooks Glycerin 23 Forefoot Compression Video Sample

SAMPLE

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Forefoot Energy Return  

 Preview Graph
Brooks Glycerin Flex Forefoot Energy Return
Brooks Glycerin 23 Forefoot Energy Return Sample

SAMPLE

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Forefoot Energy Return 
 

66.9%
Lock%

Heel Cushioning 
 

7.6
N/A

Heel Cushioning Picture  

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Brooks Glycerin Flex Heel Cushioning Picture
Brooks Glycerin 23 Heel Cushioning Picture Sample

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Heel Cushioning  

 Preview Graph
Brooks Glycerin Flex Heel Cushioning
Brooks Glycerin 23 Heel Cushioning Sample

SAMPLE

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Energy Absorbed At 550N 
 

3.68 J
Lock J

Energy Absorbed At 1100N 
 

9.24 J
Lock J

Energy Absorbed At 1900N 
 

15.10 J
Lock J

Forefoot Cushioning 
 

6.6
N/A

Forefoot Cushioning Picture  

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Brooks Glycerin Flex Forefoot Cushioning Picture
Brooks Glycerin 23 Forefoot Cushioning Picture Sample

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Forefoot Cushioning  

 Preview Graph
Brooks Glycerin Flex Forefoot Cushioning
Brooks Glycerin 23 Forefoot Cushioning Sample

SAMPLE

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for pictures & test results

Energy Absorbed At 800N 
 

4.17 J
Lock J

Energy Absorbed At 1300N 
 

7.06 J
Lock J

Energy Absorbed At 2050N 
 

10.22 J
Lock J

Heel Firmness 
 

5.5
N/A

Heel Firmness  

 Preview Graph
Brooks Glycerin Flex Heel Firmness
Brooks Glycerin 23 Heel Firmness Sample

SAMPLE

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for pictures & test results

Firmness At 550N 
 

46.1 N/mm
Lock N/mm

Firmness At 1100N 
 

129.2 N/mm
Lock N/mm

Firmness At 1900N 
 

253.1 N/mm
Lock N/mm

Forefoot Firmness 
 

8.5
N/A

Forefoot Firmness  

 Preview Graph
Brooks Glycerin Flex Forefoot Firmness
Brooks Glycerin 23 Forefoot Firmness Sample

SAMPLE

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Firmness At 800N 
 

120.3 N/mm
Lock N/mm

Firmness At 1300N 
 

260.2 N/mm
Lock N/mm

Firmness At 2050N 
 

463.3 N/mm
Lock N/mm

Forefoot Long Run Cushioning 
 

5.4
N/A

Forefoot Long Run Cushioning  

 Preview Graph
Brooks Glycerin Flex Forefoot Long Run Cushioning
Brooks Glycerin 23 Forefoot Long Run Cushioning Sample

SAMPLE

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Energy Absorbed At 10km 
 

6.04 J
Lock J

Energy Absorbed At 20km 
 

5.82 J
Lock J

Energy Absorbed At 30km 
 

5.71 J
Lock J

Energy Absorbed At 40km 
 

5.64 J
Lock J

Check Price

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Amazon.com
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SEE PRICE
Brooks
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DicksSportingGoods.com
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Brooks Glycerin Flex

Brooks Glycerin 23

Comments

  1. Comparison
 • Posted 16 minutes ago

Brooks Glycerin Flex vs Brooks Glycerin 23: Main Discussion

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