Brooks Glycerin Max 2 vs Glycerin Flex

Which Running Shoe Is Better?

Products

Brooks Glycerin Max 2
Brooks Glycerin Flex

Tested using Methodology v0.10

Updated Mar 16, 2026 07:42 PM

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Amazon.com

Tested using Methodology v0.10

Updated Mar 24, 2026 01:27 PM

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Amazon.com
  1. Recommended in 1 article:
  2. Long Distance

Our Verdict

Brooks Glycerin Max 2

Brooks Glycerin Flex

The Brooks Glycerin Flex and Brooks Glycerin Max 2 sit in the same extended Glycerin family, and both use versions of Brooks' DNA Tuned midsole, but they deliver two completely different rides. The Glycerin Max 2 is built around an ultra-high stack and lower drop with a much softer, more cushioned ride and a pronounced rocker that keeps transitions rolling forward, making it a great option for easy days. The Brooks Glycerin Flex takes a very different approach: it weighs less, with a higher drop and a decoupled midsole design that uses a diagonal groove and multiple articulating pods in the forefoot to create a noticeably more flexible, free-moving ride. It’s still cushioned, but not to the same degree as the Max 2, and that more grounded, segmented platform tends to feel naturally more stable despite not relying on explicit guidance features.

 

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Variants

  • Glycerin Max 2 (Grey/Coconut/Metallic - (Women - US 7))
  • Glycerin Max 2 (Orange/Beacon Blue/Nightlife - (Men - US 9))
  • Glycerin Flex (Black/White - (Women - US 7))
  • Glycerin Flex (Coconut/Chateau/Portabella - (Women - US 7))

Main Differences for
Marathon Racing

Threshold 

0.10

Marathon Racing 
 

5.5
4.5

Forefoot Stack Height 
 

41.0 mm
25.7 mm

Weight  

3.7
5.9

Forefoot Energy Return 
 

3.1
1.6

Heel Stack Height 
 

47.9 mm
36.6 mm

Heel Energy Return 
 

2.0
0.7

Full Comparison

Design

Weight  

3.7
5.9

Right Shoe Weight Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Right Shoe Weight Photo
Compare High-Res
Brooks Glycerin Flex Right Shoe Weight Photo

Left Shoe Weight Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Left Shoe Weight Photo
Compare High-Res
Brooks Glycerin Flex Left Shoe Weight Photo

Weight 
 

314.3 g (11.09 oz)
262.7 g (9.26 oz)
Show Text 

Stack Heights 
 

Stack Height Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Stack Height Photo
Compare High-Res
Brooks Glycerin Flex Stack Height Photo

Heel Stack Height 
 

47.9 mm
36.6 mm

Forefoot Stack Height 
 

41.0 mm
25.7 mm

Heel-To-Toe Drop 
 

6.9 mm
10.9 mm

Advertised Heel-To-Toe Drop 
 

6.0 mm
6.0 mm

External Shape 
 

3D Model Full Shoe  

Preview 3D
Brooks Glycerin Max 2 3D Model Full Shoe
Preview 3D
Brooks Glycerin Flex 3D Model Full Shoe

Outsole Heel Width 
 

88 mm (3.5")
91 mm (3.6")

Outsole Arch Width 
 

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

Outsole Forefoot Width 
 

114 mm (4.5")
113 mm (4.5")

Heel Width-To-Stack Ratio 
 

1.84
2.49

Forefoot Width-To-Stack Ratio 
 

2.78
4.39

Internal Shape 
 

3D Model Internal  

Preview 3D
Brooks Glycerin Max 2 3D Model Internal
Preview 3D
Brooks Glycerin Flex 3D Model Internal

Internal Length 
 

280 mm (11.0")
281 mm (11.1")

Internal Heel Width 
 

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

Internal Forefoot Width 
 

92 mm (3.6")
95 mm (3.7")

Wide Sizing Available 
 

No
No

Forefoot Fit: Width 
 

9.5
9.7

Forefoot Width Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Forefoot Width Photo
Compare High-Res
Brooks Glycerin Flex Forefoot Width Photo

Ball-Of-Foot TTS Deviation 
 

1.2 mm (0.047")
1.7 mm (0.066")

Toe TTS Deviation 
 

5.3 mm (0.208")
1.5 mm (0.058")

Forefoot Fit: Height 
 

8.1
9.8

Forefoot Height Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Forefoot Height Photo
Compare High-Res
Brooks Glycerin Flex Forefoot Height Photo

Toe TTS Deviation 
 

-2.4 mm (-0.095")
-0.7 mm (-0.028")

Arch Fit: Width 
 

9.9
6.4

Arch Fit Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Arch Fit Photo
Compare High-Res
Brooks Glycerin Flex Arch Fit Photo

Arch Width TTS Deviation 
 

1.2 mm (0.047")
-5.3 mm (-0.209")

Length Fit 
 

10
10

Toe Clearance Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Toe Clearance Photo
Compare High-Res
Brooks Glycerin Flex Toe Clearance Photo

Other Features  

Other Features Photo 
 

Compare High-Res
Brooks Glycerin Max 2 Other Features Photo
Compare High-Res
Brooks Glycerin Flex Other Features Photo

Tongue Gusset Type 
 

Non-gusseted
Non-gusseted

Plate 
 

None
None
Show Text 
Performance

Heel Energy Return 
 

2.0
0.7

Heel Compression Video  

Heel Energy Return  

 Preview Graph
Brooks Glycerin Max 2 Heel Energy Return
 Preview Graph
Brooks Glycerin Flex Heel Energy Return

Heel Energy Return 
 

67.8%
62.4%
Show Text 

Forefoot Energy Return 
 

3.1
1.6

Forefoot Compression Video  

Forefoot Energy Return  

 Preview Graph
Brooks Glycerin Max 2 Forefoot Energy Return
 Preview Graph
Brooks Glycerin Flex Forefoot Energy Return

Forefoot Energy Return 
 

69.6%
66.9%
Show Text 

Heel Cushioning 
 

8.5
7.6

Heel Cushioning Picture 
 

Compare High-Res
Brooks Glycerin Max 2 Heel Cushioning Picture
Compare High-Res
Brooks Glycerin Flex Heel Cushioning Picture

Heel Cushioning  

 Preview Graph
Brooks Glycerin Max 2 Heel Cushioning
 Preview Graph
Brooks Glycerin Flex Heel Cushioning

Energy Absorbed At 550N 
 

3.47 J
3.68 J

Energy Absorbed At 1100N 
 

10.81 J
9.24 J

Energy Absorbed At 1900N 
 

19.55 J
15.10 J
Show Text 

Forefoot Cushioning 
 

9.0
6.6

Forefoot Cushioning Picture 
 

Compare High-Res
Brooks Glycerin Max 2 Forefoot Cushioning Picture
Compare High-Res
Brooks Glycerin Flex Forefoot Cushioning Picture

Forefoot Cushioning  

 Preview Graph
Brooks Glycerin Max 2 Forefoot Cushioning
 Preview Graph
Brooks Glycerin Flex Forefoot Cushioning

Energy Absorbed At 800N 
 

5.33 J
4.17 J

Energy Absorbed At 1300N 
 

10.19 J
7.06 J

Energy Absorbed At 2050N 
 

15.84 J
10.22 J
Show Text 

Heel Firmness 
 

4.1
5.5

Heel Firmness  

 Preview Graph
Brooks Glycerin Max 2 Heel Firmness
 Preview Graph
Brooks Glycerin Flex Heel Firmness

Firmness At 550N 
 

46.4 N/mm
46.1 N/mm

Firmness At 1100N 
 

85.8 N/mm
129.2 N/mm

Firmness At 1900N 
 

170.7 N/mm
253.1 N/mm
Show Text 

Forefoot Firmness 
 

6.1
8.5

Forefoot Firmness  

 Preview Graph
Brooks Glycerin Max 2 Forefoot Firmness
 Preview Graph
Brooks Glycerin Flex Forefoot Firmness

Firmness At 800N 
 

78.4 N/mm
120.3 N/mm

Firmness At 1300N 
 

147.1 N/mm
260.2 N/mm

Firmness At 2050N 
 

273.9 N/mm
463.3 N/mm
Show Text 

Forefoot Long Run Cushioning 
 

8.4
5.4

Forefoot Long Run Cushioning  

 Preview Graph
Brooks Glycerin Max 2 Forefoot Long Run Cushioning
 Preview Graph
Brooks Glycerin Flex Forefoot Long Run Cushioning

Energy Absorbed At 10km 
 

9.41 J
6.04 J

Energy Absorbed At 20km 
 

9.15 J
5.82 J

Energy Absorbed At 30km 
 

9.02 J
5.71 J

Energy Absorbed At 40km 
 

8.93 J
5.64 J
Show Text 

Brooks Glycerin Max 2

Brooks Glycerin Flex

Comments

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