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R.A.D UFO vs 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

R.A.D UFO
R.A.D SYNTH 
early access

Tested using Methodology v0.11

Updated Apr 30, 2026 06:18 PM

SEE PRICE
R.A.D

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
R.A.D UFO Picture

Track

R.A.D SYNTH Picture

Track

Weight
247.4 g (8.73 oz)
Heel-To-Toe Drop
8.1 mm
Plate
None
Weight
231.1 g (8.15 oz)
Heel-To-Toe Drop
6.0 mm
Plate
None

Our Verdict

R.A.D UFO

R.A.D SYNTH

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

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Variants

  • UFO (Highlighter Pink - (Men - US 9))
  • UFO (Racing Blue - (Women - US 7))
  • SYNTH (Acid Green - (Men - US 9))
  • SYNTH (Fuchsia Flash - (Women - US 7))

Review

See R.A.D UFO Review
See R.A.D SYNTH Review
0 
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Main Differences for
Marathon Racing

Threshold 

0.10

Marathon Racing 
 

7.7
0.0
No major differences between these running shoes for marathon racing. See full list of tests below.

Full Comparison

Design

Weight  

6.5
N/A

Right Shoe Weight Photo  

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R.A.D UFO Right Shoe Weight Photo
R.A.D SYNTH Right Shoe Weight Photo Sample

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Left Shoe Weight Photo  

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R.A.D UFO Left Shoe Weight Photo
R.A.D SYNTH Left Shoe Weight Photo Sample

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Weight 
 

247.4 g (8.73 oz)
Lock g (Lock oz)

Stack Heights 
 

Stack Height Photo  

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R.A.D UFO Stack Height Photo
R.A.D SYNTH Stack Height Photo Sample

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Heel Stack Height 
 

43.4 mm
Lock mm

Forefoot Stack Height 
 

35.3 mm
Lock mm

Heel-To-Toe Drop 
 

8.1 mm
Lock mm

Advertised Heel-To-Toe Drop 
 

8.0 mm
Lock mm

External Shape 
 

3D Model Full Shoe  

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R.A.D UFO 3D Model Full Shoe
R.A.D SYNTH 3D Model Full Shoe Sample

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Outsole Heel Width 
 

100 mm (3.9")
Lock mm (Lock")

Outsole Arch Width 
 

81 mm (3.2")
Lock mm (Lock")

Outsole Forefoot Width 
 

119 mm (4.7")
Lock mm (Lock")

Heel Width-To-Stack Ratio 
 

2.30
Lock

Forefoot Width-To-Stack Ratio 
 

3.37
Lock

Internal Shape 
 

3D Model Internal  

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R.A.D UFO 3D Model Internal
R.A.D SYNTH 3D Model Internal Sample

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Internal Length 
 

279 mm (11.0")
Lock mm (Lock")

Internal Heel Width 
 

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

Internal Forefoot Width 
 

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

Wide Sizing Available 
 

No
Locked

Forefoot Fit: Width 
 

8.6
N/A

Forefoot Width Photo  

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R.A.D UFO Forefoot Width Photo
R.A.D SYNTH Forefoot Width Photo Sample

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Ball-Of-Foot TTS Deviation 
 

0.1 mm (0.004")
Lock mm (Lock")

Toe TTS Deviation 
 

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

Forefoot Fit: Height 
 

2.7
N/A

Forefoot Height Photo  

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R.A.D UFO Forefoot Height Photo
R.A.D SYNTH Forefoot Height Photo Sample

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Toe TTS Deviation 
 

-8.5 mm (-0.335")
Lock mm (Lock")

Arch Fit: Width 
 

9.8
N/A

Arch Fit Photo  

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R.A.D UFO Arch Fit Photo
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Arch Width TTS Deviation 
 

2.5 mm (0.098")
Lock mm (Lock")

Length Fit 
 

10
N/A

Toe Clearance Photo  

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R.A.D UFO Toe Clearance Photo
R.A.D SYNTH Toe Clearance Photo Sample

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Heel Rocker Geometry 
 

7.2
N/A

Heel Rocker Photo  

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R.A.D UFO Heel Rocker Photo
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Heel Spring 
 

27 mm (1.1")
Lock mm (Lock")

Heel Apex Position 
 

34.7%
Lock%

Heel Rocker Angle 
 

14.7°
Lock°

Forefoot Rocker Geometry 
 

7.3
N/A

Forefoot Rocker Photo  

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R.A.D UFO Forefoot Rocker Photo
R.A.D SYNTH Forefoot Rocker Photo Sample

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Toe Spring 
 

50 mm (2.0")
Lock mm (Lock")

Toe Apex Position 
 

56.2%
Lock%

Forefoot Rocker Angle 
 

21.0°
Lock°

Other Features  

Other Features Photo  

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R.A.D UFO Other Features Photo
R.A.D SYNTH Other Features Photo Sample

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Tongue Gusset Type 
 

Fully-gusseted
Locked

Plate 
 

None
Locked
Performance

Heel Compression Energy Return 
 

8.1
N/A

Heel Compression Video  

R.A.D SYNTH Heel Compression Video Sample

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Heel Energy Return  

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R.A.D UFO Heel Energy Return
R.A.D SYNTH Heel Energy Return Sample

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Heel Energy Return 
 

81.4%
Lock%

Forefoot Compression Energy Return 
 

8.4
N/A

Forefoot Compression Video  

R.A.D SYNTH Forefoot Compression Video Sample

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Forefoot Energy Return  

 Preview Graph
R.A.D UFO Forefoot Energy Return
R.A.D SYNTH Forefoot Energy Return Sample

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Forefoot Energy Return 
 

83.1%
Lock%

Heel Cushioning 
 

8.6
N/A

Heel Cushioning Picture  

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R.A.D UFO Heel Cushioning Picture
R.A.D SYNTH Heel Cushioning Picture Sample

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Heel Cushioning  

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R.A.D UFO Heel Cushioning
R.A.D SYNTH Heel Cushioning Sample

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Energy Absorbed At 550N 
 

4.19 J
Lock J

Energy Absorbed At 1100N 
 

10.28 J
Lock J

Energy Absorbed At 1900N 
 

17.45 J
Lock J

Forefoot Cushioning 
 

8.5
N/A

Forefoot Cushioning Picture  

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R.A.D UFO Forefoot Cushioning Picture
R.A.D SYNTH Forefoot Cushioning Picture Sample

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Forefoot Cushioning  

 Preview Graph
R.A.D UFO Forefoot Cushioning
R.A.D SYNTH Forefoot Cushioning Sample

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Energy Absorbed At 800N 
 

5.53 J
Lock J

Energy Absorbed At 1300N 
 

9.27 J
Lock J

Energy Absorbed At 2050N 
 

13.32 J
Lock J

Heel Firmness 
 

5.0
N/A

Heel Firmness  

 Preview Graph
R.A.D UFO Heel Firmness
R.A.D SYNTH Heel Firmness Sample

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Firmness At 550N 
 

47.8 N/mm
Lock N/mm

Firmness At 1100N 
 

106.0 N/mm
Lock N/mm

Firmness At 1900N 
 

221.1 N/mm
Lock N/mm

Forefoot Firmness 
 

7.8
N/A

Forefoot Firmness  

 Preview Graph
R.A.D UFO Forefoot Firmness
R.A.D SYNTH Forefoot Firmness Sample

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Firmness At 800N 
 

95.9 N/mm
Lock N/mm

Firmness At 1300N 
 

199.4 N/mm
Lock N/mm

Firmness At 2050N 
 

410.2 N/mm
Lock N/mm

Forefoot Long Run Cushioning 
 

8.2
N/A

Forefoot Long Run Cushioning  

 Preview Graph
R.A.D UFO Forefoot Long Run Cushioning
R.A.D SYNTH Forefoot Long Run Cushioning Sample

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Energy Absorbed At 10km 
 

8.97 J
Lock J

Energy Absorbed At 20km 
 

8.84 J
Lock J

Energy Absorbed At 30km 
 

8.75 J
Lock J

Energy Absorbed At 40km 
 

8.69 J
Lock J

Rocker Stiffness 
 

5.9
N/A

Forefoot Rocker Stiffness Video  

R.A.D SYNTH Forefoot Rocker Stiffness Video Sample

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Forefoot Rocker Stiffness Graph  

 Preview Graph
R.A.D UFO Forefoot Rocker Stiffness Graph
R.A.D SYNTH Forefoot Rocker Stiffness Graph Sample

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Force To Flatten The Rocker 
 

58 N
Lock N

Forefoot Bending Energy Return 
 

8.1
N/A

Forefoot Bending Video  

R.A.D SYNTH Forefoot Bending Video Sample

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Forefoot Bending Energy Return  

 Preview Graph
R.A.D UFO Forefoot Bending Energy Return
R.A.D SYNTH Forefoot Bending Energy Return Sample

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Forefoot Bending Energy Return 
 

72.3%
Lock%

Forefoot Bending Stiffness 
 

5.8
N/A

Forefoot Bending Resistance Picture  

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R.A.D UFO Forefoot Bending Resistance Picture
R.A.D SYNTH Forefoot Bending Resistance Picture Sample

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Forefoot Bending Resistance  

 Preview Graph
R.A.D UFO Forefoot Bending Resistance
R.A.D SYNTH Forefoot Bending Resistance Sample

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Forefoot Bending Stiffness 
 

8.1 N/mm
Lock N/mm

Forefoot Bending Force 
 

221 N
Lock N

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R.A.D UFO

R.A.D SYNTH

Comments

  1. Comparison
 • Posted 2 hours ago

R.A.D UFO vs R.A.D SYNTH: Main Discussion

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