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PUMA Velocity NITRO 4 vs R.A.D SYNTH

Which Running Shoe Is Better?

    Top
    Main Differences
    Design
      WeightStack HeightsExternal ShapeInternal ShapeForefoot Fit: WidthForefoot Fit: HeightArch Fit: WidthLength FitHeel Rocker GeometryForefoot Rocker GeometryOther Features
    Performance
      Heel Compression Energy ReturnForefoot Compression Energy ReturnHeel CushioningForefoot CushioningHeel FirmnessForefoot FirmnessForefoot Long Run CushioningRocker StiffnessForefoot Bending Energy ReturnForefoot Bending Stiffness
    Comments

Products

PUMA Velocity NITRO 4
R.A.D SYNTH 
early access

Tested using Methodology v0.9

Updated Mar 17, 2026 02:14 PM

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Amazon

Tested using Methodology v0.11

Updated May 08, 2026 01:07 PM

This review is in Early access

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R.A.D
PUMA Velocity NITRO 4 Picture

Track

R.A.D SYNTH Picture

Track

Weight
232.3 g (8.19 oz)
Heel-To-Toe Drop
11.1 mm
Plate
None
Weight
231.1 g (8.15 oz)
Heel-To-Toe Drop
6.0 mm
Plate
None

Our Verdict

PUMA Velocity NITRO 4

R.A.D SYNTH

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

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Variants

  • Velocity NITRO 4 (Black - (Men - US 9))
  • Velocity NITRO 4 (Black/Dark Amethyst - (Men - US 9))
  • SYNTH (Acid Green - (Men - US 9))
  • SYNTH (Fuchsia Flash - (Women - US 7))

Review

See PUMA Velocity NITRO 4 Review
See R.A.D SYNTH Review
0 
0 

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Main Differences for
Marathon Racing

Threshold 

0.10

Marathon Racing 
 

6.5
0.0
No major differences between these running shoes for marathon racing. See full list of tests below.

Full Comparison

Design

Weight  

7.1
N/A

Right Shoe Weight Photo  

Compare High-Res
PUMA Velocity NITRO 4 Right Shoe Weight Photo
R.A.D SYNTH Right Shoe Weight Photo Sample

SAMPLE

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Left Shoe Weight Photo  

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PUMA Velocity NITRO 4 Left Shoe Weight Photo
R.A.D SYNTH Left Shoe Weight Photo Sample

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Weight 
 

232.3 g (8.19 oz)
Lock g (Lock oz)

Stack Heights 
 

Stack Height Photo  

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PUMA Velocity NITRO 4 Stack Height Photo
R.A.D SYNTH Stack Height Photo Sample

SAMPLE

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Heel Stack Height 
 

37.2 mm
Lock mm

Forefoot Stack Height 
 

26.1 mm
Lock mm

Heel-To-Toe Drop 
 

11.1 mm
Lock mm

Advertised Heel-To-Toe Drop 
 

10.0 mm
Lock mm

External Shape 
 

3D Model Full Shoe  

Preview 3D
PUMA Velocity NITRO 4 3D Model Full Shoe
R.A.D SYNTH 3D Model Full Shoe Sample

SAMPLE

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Outsole Heel Width 
 

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

Outsole Arch Width 
 

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

Outsole Forefoot Width 
 

103 mm (4.0")
Lock mm (Lock")

Heel Width-To-Stack Ratio 
 

2.28
Lock

Forefoot Width-To-Stack Ratio 
 

3.95
Lock

Internal Shape 
 

3D Model Internal  

Preview 3D
PUMA Velocity NITRO 4 3D Model Internal
R.A.D SYNTH 3D Model Internal Sample

SAMPLE

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Internal Length 
 

278 mm (10.9")
Lock mm (Lock")

Internal Heel Width 
 

62 mm (2.4")
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  

R.A.D SYNTH Forefoot Width Photo Sample

SAMPLE

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Ball-Of-Foot TTS Deviation 
 

Lock mm (Lock")

Toe TTS Deviation 
 

Lock mm (Lock")

Forefoot Fit: Height 
 

N/A

Forefoot Height Photo  

R.A.D SYNTH Forefoot Height Photo Sample

SAMPLE

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Toe TTS Deviation 
 

Lock mm (Lock")

Arch Fit: Width 
 

N/A

Arch Fit Photo  

R.A.D SYNTH Arch Fit Photo Sample

SAMPLE

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Arch Width TTS Deviation 
 

Lock mm (Lock")

Length Fit 
 

N/A

Toe Clearance Photo  

R.A.D SYNTH Toe Clearance Photo Sample

SAMPLE

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Heel Rocker Geometry 
 

N/A

Heel Rocker Photo  

R.A.D SYNTH Heel Rocker Photo Sample

SAMPLE

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Heel Spring 
 

Lock mm (Lock")

Heel Apex Position 
 

Lock%

Heel Rocker Angle 
 

Lock°

Forefoot Rocker Geometry 
 

N/A

Forefoot Rocker Photo  

R.A.D SYNTH Forefoot Rocker Photo Sample

SAMPLE

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Toe Spring 
 

Lock mm (Lock")

Toe Apex Position 
 

Lock%

Forefoot Rocker Angle 
 

Lock°

Other Features  

Other Features Photo  

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PUMA Velocity NITRO 4 Other Features Photo
R.A.D SYNTH Other Features Photo Sample

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Tongue Gusset Type 
 

Semi-gusseted
Locked

Plate 
 

None
Locked
Performance

Heel Compression Energy Return 
 

7.1
N/A

Heel Compression Video  

R.A.D SYNTH Heel Compression Video Sample

SAMPLE

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Heel Energy Return  

 Preview Graph
PUMA Velocity NITRO 4 Heel Energy Return
R.A.D SYNTH Heel Energy Return Sample

SAMPLE

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Heel Energy Return 
 

76.6%
Lock%

Forefoot Compression Energy Return 
 

7.8
N/A

Forefoot Compression Video  

R.A.D SYNTH Forefoot Compression Video Sample

SAMPLE

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Forefoot Energy Return  

 Preview Graph
PUMA Velocity NITRO 4 Forefoot Energy Return
R.A.D SYNTH Forefoot Energy Return Sample

SAMPLE

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Forefoot Energy Return 
 

79.9%
Lock%

Heel Cushioning 
 

7.2
N/A

Heel Cushioning Picture  

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PUMA Velocity NITRO 4 Heel Cushioning Picture
R.A.D SYNTH Heel Cushioning Picture Sample

SAMPLE

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Heel Cushioning  

 Preview Graph
PUMA Velocity NITRO 4 Heel Cushioning
R.A.D SYNTH Heel Cushioning Sample

SAMPLE

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Energy Absorbed At 550N 
 

3.56 J
Lock J

Energy Absorbed At 1100N 
 

8.90 J
Lock J

Energy Absorbed At 1900N 
 

14.28 J
Lock J

Forefoot Cushioning 
 

6.2
N/A

Forefoot Cushioning Picture  

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PUMA Velocity NITRO 4 Forefoot Cushioning Picture
R.A.D SYNTH Forefoot Cushioning Picture Sample

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Forefoot Cushioning  

 Preview Graph
PUMA Velocity NITRO 4 Forefoot Cushioning
R.A.D SYNTH Forefoot Cushioning Sample

SAMPLE

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Energy Absorbed At 800N 
 

4.12 J
Lock J

Energy Absorbed At 1300N 
 

6.66 J
Lock J

Energy Absorbed At 2050N 
 

9.39 J
Lock J

Heel Firmness 
 

6.3
N/A

Heel Firmness  

 Preview Graph
PUMA Velocity NITRO 4 Heel Firmness
R.A.D SYNTH Heel Firmness Sample

SAMPLE

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Firmness At 550N 
 

51.7 N/mm
Lock N/mm

Firmness At 1100N 
 

130.5 N/mm
Lock N/mm

Firmness At 1900N 
 

319.7 N/mm
Lock N/mm

Forefoot Firmness 
 

9.0
N/A

Forefoot Firmness  

 Preview Graph
PUMA Velocity NITRO 4 Forefoot Firmness
R.A.D SYNTH Forefoot Firmness Sample

SAMPLE

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Firmness At 800N 
 

137.6 N/mm
Lock N/mm

Firmness At 1300N 
 

297.8 N/mm
Lock N/mm

Firmness At 2050N 
 

585.1 N/mm
Lock N/mm

Forefoot Long Run Cushioning 
 

5.8
N/A

Forefoot Long Run Cushioning  

 Preview Graph
PUMA Velocity NITRO 4 Forefoot Long Run Cushioning
R.A.D SYNTH Forefoot Long Run Cushioning Sample

SAMPLE

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Energy Absorbed At 10km 
 

6.35 J
Lock J

Energy Absorbed At 20km 
 

6.21 J
Lock J

Energy Absorbed At 30km 
 

6.11 J
Lock J

Energy Absorbed At 40km 
 

6.05 J
Lock J

Rocker Stiffness 
 

N/A

Forefoot Rocker Stiffness Video  

R.A.D SYNTH Forefoot Rocker Stiffness Video Sample

SAMPLE

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Forefoot Rocker Stiffness Graph  

R.A.D SYNTH Forefoot Rocker Stiffness Graph Sample

SAMPLE

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Force To Flatten The Rocker 
 

Lock N

Forefoot Bending Energy Return 
 

N/A

Forefoot Bending Video  

R.A.D SYNTH Forefoot Bending Video Sample

SAMPLE

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Forefoot Bending Energy Return  

R.A.D SYNTH Forefoot Bending Energy Return Sample

SAMPLE

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Forefoot Bending Energy Return 
 

Lock%

Forefoot Bending Stiffness 
 

N/A

Forefoot Bending Resistance Picture  

R.A.D SYNTH Forefoot Bending Resistance Picture Sample

SAMPLE

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Forefoot Bending Resistance  

R.A.D SYNTH Forefoot Bending Resistance Sample

SAMPLE

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Forefoot Bending Stiffness 
 

Lock N/mm

Forefoot Bending Force 
 

Lock N

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PUMA Velocity NITRO 4

R.A.D SYNTH

Comments

  1. Comparison
 • Posted 2 hours ago

PUMA Velocity NITRO 4 vs R.A.D SYNTH: Main Discussion

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