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Brooks Adrenaline GTS 25 vs Glycerin Flex

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 Adrenaline GTS 25
Brooks Glycerin Flex 
early access

Tested using Methodology v0.9

Updated Jan 22, 2026 07:55 PM

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Tested using Methodology v0.10

Updated Feb 25, 2026 04:36 PM

This review is in Early access

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Brooks Adrenaline GTS 25 Picture
Brooks Glycerin Flex Picture
Weight
289.1 g (10.20 oz)
Heel-To-Toe Drop
13.6 mm
Plate
None
Weight
Lock g (Lock oz)
Heel-To-Toe Drop
Lock mm
Plate
Locked

Our Verdict

Brooks Adrenaline GTS 25

Brooks Glycerin Flex

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

  • Adrenaline GTS 25 (Black/Biscuit - (Men - US 9))
  • Adrenaline GTS 25 (Black/Black/Ebony - (Men - US 9))
  • Glycerin Flex (Black/White - (Women - US 7))
  • Glycerin Flex (White/Green Gecko/Phantom - (Men - US 9))

Review

See Brooks Adrenaline GTS 25 Review
See Brooks Glycerin Flex Review
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Main Differences for
Marathon Racing

Threshold 

0.10

Marathon Racing 
 

5.1
0.0
No major differences between these running shoes for marathon racing. See full list of tests below.

Full Comparison

Design

Weight  

4.8
N/A

Right Shoe Weight Photo 
 

Compare High-Res
Brooks Adrenaline GTS 25 Right Shoe Weight Photo
Brooks Glycerin Flex Right Shoe Weight Photo Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Left Shoe Weight Photo 
 

Compare High-Res
Brooks Adrenaline GTS 25 Left Shoe Weight Photo
Brooks Glycerin Flex Left Shoe Weight Photo Sample

SAMPLE

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To see pictures and test results

Weight 
 

289.1 g (10.20 oz)
Lock g (Lock oz)
Show Text 

Stack Heights 
 

Stack Height Photo 
 

Compare High-Res
Brooks Adrenaline GTS 25 Stack Height Photo
Brooks Glycerin Flex Stack Height Photo Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Heel Stack Height 
 

40.9 mm
Lock mm

Forefoot Stack Height 
 

27.3 mm
Lock mm

Heel-To-Toe Drop 
 

13.6 mm
Lock mm

Advertised Heel-To-Toe Drop 
 

12.0 mm
Lock mm
Show Text 

External Shape 
 

3D Model Full Shoe  

Preview 3D
Brooks Adrenaline GTS 25 3D Model Full Shoe
Brooks Glycerin Flex 3D Model Full Shoe Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Outsole Heel Width 
 

93 mm (3.7")
Lock mm (Lock")

Outsole Arch Width 
 

77 mm (3.0")
Lock mm (Lock")

Outsole Forefoot Width 
 

110 mm (4.3")
Lock mm (Lock")

Heel Width-To-Stack Ratio 
 

2.27
Lock

Forefoot Width-To-Stack Ratio 
 

4.03
Lock

Internal Shape 
 

3D Model Internal  

Preview 3D
Brooks Adrenaline GTS 25 3D Model Internal
Brooks Glycerin Flex 3D Model Internal Sample

SAMPLE

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To see pictures and test results

Internal Length 
 

280 mm (11.0")
Lock mm (Lock")

Internal Heel Width 
 

65 mm (2.6")
Lock mm (Lock")

Internal Forefoot Width 
 

90 mm (3.5")
Lock mm (Lock")

Wide Sizing Available 
 

Yes
Locked

Forefoot Fit: Width 
 

N/A

Forefoot Width Photo  

Brooks Glycerin Flex Forefoot Width Photo Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Ball-Of-Foot TTS Deviation 
 

Lock mm (Lock")

Toe TTS Deviation 
 

Lock mm (Lock")

Forefoot Fit: Height 
 

N/A

Forefoot Height Photo  

Brooks Glycerin Flex Forefoot Height Photo Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Toe TTS Deviation 
 

Lock mm (Lock")

Arch Fit: Width 
 

N/A

Arch Fit Photo  

Brooks Glycerin Flex Arch Fit Photo Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Arch Width TTS Deviation 
 

Lock mm (Lock")

Length Fit 
 

N/A

Toe Clearance Photo  

Brooks Glycerin Flex Toe Clearance Photo Sample

SAMPLE

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To see pictures and test results

Other Features  

Other Features Photo 
 

Compare High-Res
Brooks Adrenaline GTS 25 Other Features Photo
Brooks Glycerin Flex Other Features Photo Sample

SAMPLE

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To see pictures and test results

Tongue Gusset Type 
 

Non-gusseted
Locked

Plate 
 

None
Locked
Performance

Heel Energy Return 
 

1.8
N/A

Heel Compression Video  

Brooks Glycerin Flex Heel Compression Video Sample

SAMPLE

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To see product videos

Heel Energy Return  

 Preview Graph
Brooks Adrenaline GTS 25 Heel Energy Return
Brooks Glycerin Flex Heel Energy Return Sample

SAMPLE

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To see pictures and test results

Heel Energy Return 
 

67.4%
Lock%
Show Text 

Forefoot Energy Return 
 

2.6
N/A

Forefoot Compression Video  

Brooks Glycerin Flex Forefoot Compression Video Sample

SAMPLE

GET INSIDER ACCESS

To see product videos

Forefoot Energy Return  

 Preview Graph
Brooks Adrenaline GTS 25 Forefoot Energy Return
Brooks Glycerin Flex Forefoot Energy Return Sample

SAMPLE

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To see pictures and test results

Forefoot Energy Return 
 

69.0%
Lock%
Show Text 

Heel Cushioning 
 

7.2
N/A

Heel Cushioning Picture 
 

Compare High-Res
Brooks Adrenaline GTS 25 Heel Cushioning Picture
Brooks Glycerin Flex Heel Cushioning Picture Sample

SAMPLE

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To see pictures and test results

Heel Cushioning  

 Preview Graph
Brooks Adrenaline GTS 25 Heel Cushioning
Brooks Glycerin Flex Heel Cushioning Sample

SAMPLE

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To see pictures and test results

Energy Absorbed At 550N 
 

3.05 J
Lock J

Energy Absorbed At 1100N 
 

8.96 J
Lock J

Energy Absorbed At 1900N 
 

16.00 J
Lock J
Show Text 

Forefoot Cushioning 
 

5.2
N/A

Forefoot Cushioning Picture 
 

Compare High-Res
Brooks Adrenaline GTS 25 Forefoot Cushioning Picture
Brooks Glycerin Flex Forefoot Cushioning Picture Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Forefoot Cushioning  

 Preview Graph
Brooks Adrenaline GTS 25 Forefoot Cushioning
Brooks Glycerin Flex Forefoot Cushioning Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Energy Absorbed At 800N 
 

3.21 J
Lock J

Energy Absorbed At 1300N 
 

5.60 J
Lock J

Energy Absorbed At 2050N 
 

8.34 J
Lock J
Show Text 

Heel Firmness 
 

5.6
N/A

Heel Firmness  

 Preview Graph
Brooks Adrenaline GTS 25 Heel Firmness
Brooks Glycerin Flex Heel Firmness Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Firmness At 550N 
 

56.4 N/mm
Lock N/mm

Firmness At 1100N 
 

110.8 N/mm
Lock N/mm

Firmness At 1900N 
 

215.1 N/mm
Lock N/mm
Show Text 

Forefoot Firmness 
 

9.1
N/A

Forefoot Firmness  

 Preview Graph
Brooks Adrenaline GTS 25 Forefoot Firmness
Brooks Glycerin Flex Forefoot Firmness Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Firmness At 800N 
 

152.9 N/mm
Lock N/mm

Firmness At 1300N 
 

312.8 N/mm
Lock N/mm

Firmness At 2050N 
 

545.7 N/mm
Lock N/mm
Show Text 

Forefoot Long Run Cushioning 
 

4.7
N/A

Forefoot Long Run Cushioning  

 Preview Graph
Brooks Adrenaline GTS 25 Forefoot Long Run Cushioning
Brooks Glycerin Flex Forefoot Long Run Cushioning Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Energy Absorbed At 10km 
 

5.24 J
Lock J

Energy Absorbed At 20km 
 

5.11 J
Lock J

Energy Absorbed At 30km 
 

5.05 J
Lock J

Energy Absorbed At 40km 
 

4.99 J
Lock J
Show Text 

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Brooks Adrenaline GTS 25

Brooks Glycerin Flex

Comments

  1. Comparison
 • Posted 21 hours ago

Brooks Adrenaline GTS 25 vs Brooks Glycerin Flex: Main Discussion

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