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adidas Adizero Prime X3 STRUNG vs Li-Ning Feidian 6 Ultra

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

adidas Adizero Prime X3 STRUNG
Li-Ning Feidian 6 Ultra 
early access

Tested using Methodology v0.12

Updated Jun 16, 2026 03:33 PM

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Tested using Methodology v0.11

Updated Jun 26, 2026 08:55 PM

This review is in Early access

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adidas Adizero Prime X3 STRUNG Picture

Track

Li-Ning Feidian 6 Ultra Picture

Track

Weight
291.6 g (10.29 oz)
Heel-To-Toe Drop
10.3 mm
Plate
Carbon Fiber
Weight
207.0 g (7.30 oz)
Heel-To-Toe Drop
9.3 mm
Plate
Carbon Fiber
  1. Recommended in 1 article:
  2. adidas

Our Verdict

adidas Adizero Prime X3 STRUNG

Li-Ning Feidian 6 Ultra

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

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Variants

  • Adizero Prime X3 STRUNG (Flash Aqua/Zero Metalic/Lucid Lemon - (Men - US 9))
  • Adizero Prime X3 STRUNG (Flash Aqua/Zero Metalic/Lucid Lemon - (Women - US 7))
  • Feidian 6 Ultra (Neon Bright Green - (Men - US 9))

Review

See adidas Adizero Prime X3 STRUNG Review
See Li-Ning Feidian 6 Ultra Review
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Main Differences for
Half/Full Marathon Racing

Threshold 

0.10

Half/Full Marathon Racing 
 

7.5
0.0

Plate 
 

Carbon Fiber
Locked

Full Comparison

Design

Weight  

4.7
N/A

Right Shoe Weight Photo  

adidas Adizero Prime X3 STRUNG Right Shoe Weight Photo
Li-Ning Feidian 6 Ultra Right Shoe Weight Photo Sample

SAMPLE

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for pictures & test results

Left Shoe Weight Photo  

adidas Adizero Prime X3 STRUNG Left Shoe Weight Photo
Li-Ning Feidian 6 Ultra Left Shoe Weight Photo Sample

SAMPLE

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for pictures & test results

Weight 
 

291.6 g (10.29 oz)
Lock g (Lock oz)

Stack Heights 
 

Stack Height Photo  

adidas Adizero Prime X3 STRUNG Stack Height Photo
Li-Ning Feidian 6 Ultra Stack Height Photo Sample

SAMPLE

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for pictures & test results

Heel Stack Height 
 

48.4 mm
Lock mm

Forefoot Stack Height 
 

38.1 mm
Lock mm

Heel-To-Toe Drop 
 

10.3 mm
Lock mm

Advertised Heel-To-Toe Drop 
 

7.0 mm
Lock mm

External Shape 
 

3D Model Full Shoe  

Preview 3D
adidas Adizero Prime X3 STRUNG 3D Model Full Shoe
Li-Ning Feidian 6 Ultra 3D Model Full Shoe Sample

SAMPLE

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Outsole Heel Width 
 

79 mm (3.1")
Lock mm (Lock")

Outsole Arch Width 
 

83 mm (3.3")
Lock mm (Lock")

Outsole Forefoot Width 
 

122 mm (4.8")
Lock mm (Lock")

Heel Width-To-Stack Ratio 
 

1.63
Lock

Forefoot Width-To-Stack Ratio 
 

3.20
Lock

Internal Shape 
 

3D Model Internal  

Preview 3D
adidas Adizero Prime X3 STRUNG 3D Model Internal
Li-Ning Feidian 6 Ultra 3D Model Internal Sample

SAMPLE

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Internal Length 
 

276 mm (10.9")
Lock mm (Lock")

Internal Heel Width 
 

63 mm (2.5")
Lock mm (Lock")

Internal Forefoot Width 
 

94 mm (3.7")
Lock mm (Lock")

Wide Sizing Available 
 

No
Locked

Forefoot Fit: Width 
 

8.9
N/A

Forefoot Width Photo  

adidas Adizero Prime X3 STRUNG Forefoot Width Photo
Li-Ning Feidian 6 Ultra Forefoot Width Photo Sample

SAMPLE

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Ball-Of-Foot TTS Deviation 
 

3.6 mm (0.142")
Lock mm (Lock")

Toe TTS Deviation 
 

5.8 mm (0.229")
Lock mm (Lock")

Forefoot Fit: Height 
 

10
N/A

Forefoot Height Photo  

adidas Adizero Prime X3 STRUNG Forefoot Height Photo
Li-Ning Feidian 6 Ultra Forefoot Height Photo Sample

SAMPLE

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Toe TTS Deviation 
 

2.2 mm (0.088")
Lock mm (Lock")

Arch Fit: Width 
 

0.0
N/A

Arch Fit Photo  

adidas Adizero Prime X3 STRUNG Arch Fit Photo
Li-Ning Feidian 6 Ultra Arch Fit Photo Sample

SAMPLE

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Arch Width TTS Deviation 
 

-11.2 mm (-0.439")
Lock mm (Lock")

Length Fit 
 

10
N/A

Toe Clearance Photo  

adidas Adizero Prime X3 STRUNG Toe Clearance Photo
Li-Ning Feidian 6 Ultra Toe Clearance Photo Sample

SAMPLE

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Heel Rocker Geometry 
 

7.3
N/A

Heel Rocker Photo  

adidas Adizero Prime X3 STRUNG Heel Rocker Photo
Li-Ning Feidian 6 Ultra Heel Rocker Photo Sample

SAMPLE

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Heel Spring 
 

20 mm (0.8")
Lock mm (Lock")

Heel Apex Position 
 

16.5%
Lock%

Heel Rocker Angle 
 

22.6°
Lock°

Forefoot Rocker Geometry 
 

8.1
N/A

Forefoot Rocker Photo  

adidas Adizero Prime X3 STRUNG Forefoot Rocker Photo
Li-Ning Feidian 6 Ultra Forefoot Rocker Photo Sample

SAMPLE

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Toe Spring 
 

60 mm (2.4")
Lock mm (Lock")

Toe Apex Position 
 

66.0%
Lock%

Forefoot Rocker Angle 
 

31.0°
Lock°

Other Features  

Other Features Photo  

adidas Adizero Prime X3 STRUNG Other Features Photo
Li-Ning Feidian 6 Ultra Other Features Photo Sample

SAMPLE

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Tongue Gusset Type 
 

Non-gusseted
Locked

Plate 
 

Carbon Fiber
Locked
Performance

Heel Compression Energy Return 
 

8.2
N/A

Heel Compression Video  

Li-Ning Feidian 6 Ultra Heel Compression Video Sample

SAMPLE

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Heel Energy Return  

 Preview Graph
adidas Adizero Prime X3 STRUNG Heel Energy Return
Li-Ning Feidian 6 Ultra Heel Energy Return Sample

SAMPLE

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Heel Energy Return 
 

81.9%
Lock%

Forefoot Compression Energy Return 
 

8.7
N/A

Forefoot Compression Video  

Li-Ning Feidian 6 Ultra Forefoot Compression Video Sample

SAMPLE

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Forefoot Energy Return  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Energy Return
Li-Ning Feidian 6 Ultra Forefoot Energy Return Sample

SAMPLE

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Forefoot Energy Return 
 

85.6%
Lock%

Heel Cushioning 
 

9.3
N/A

Heel Cushioning Picture  

adidas Adizero Prime X3 STRUNG Heel Cushioning Picture
Li-Ning Feidian 6 Ultra Heel Cushioning Picture Sample

SAMPLE

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Heel Cushioning  

 Preview Graph
adidas Adizero Prime X3 STRUNG Heel Cushioning
Li-Ning Feidian 6 Ultra Heel Cushioning Sample

SAMPLE

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for pictures & test results

Energy Absorbed At 550N 
 

4.16 J
Lock J

Energy Absorbed At 1100N 
 

12.18 J
Lock J

Energy Absorbed At 1900N 
 

20.84 J
Lock J

Forefoot Cushioning 
 

9.0
N/A

Forefoot Cushioning Picture  

adidas Adizero Prime X3 STRUNG Forefoot Cushioning Picture
Li-Ning Feidian 6 Ultra Forefoot Cushioning Picture Sample

SAMPLE

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Forefoot Cushioning  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Cushioning
Li-Ning Feidian 6 Ultra Forefoot Cushioning Sample

SAMPLE

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for pictures & test results

Energy Absorbed At 800N 
 

5.21 J
Lock J

Energy Absorbed At 1300N 
 

10.17 J
Lock J

Energy Absorbed At 2050N 
 

16.55 J
Lock J

Heel Firmness 
 

5.6
N/A

Heel Firmness  

Li-Ning Feidian 6 Ultra Heel Firmness Sample

SAMPLE

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Heel Firmness Graph  

 Preview Graph
adidas Adizero Prime X3 STRUNG Heel Firmness Graph
Li-Ning Feidian 6 Ultra Heel Firmness Graph Sample

SAMPLE

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for pictures & test results

Firmness At 550N 
 

37.6 N/mm
Lock N/mm

Firmness At 1100N 
 

44.4 N/mm
Lock N/mm

Firmness At 1900N 
 

61.7 N/mm
Lock N/mm

Forefoot Firmness 
 

6.9
N/A

Forefoot Firmness  

Li-Ning Feidian 6 Ultra Forefoot Firmness Sample

SAMPLE

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Forefoot Firmness Graph  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Firmness Graph
Li-Ning Feidian 6 Ultra Forefoot Firmness Graph Sample

SAMPLE

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Firmness At 800N 
 

56.4 N/mm
Lock N/mm

Firmness At 1300N 
 

68.3 N/mm
Lock N/mm

Firmness At 2050N 
 

89 N/mm
Lock N/mm

Forefoot Long Run Cushioning 
 

8.7
N/A

Forefoot Long Run Cushioning  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Long Run Cushioning
Li-Ning Feidian 6 Ultra Forefoot Long Run Cushioning Sample

SAMPLE

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for pictures & test results

Energy Absorbed At 10km 
 

9.74 J
Lock J

Energy Absorbed At 20km 
 

9.63 J
Lock J

Energy Absorbed At 30km 
 

9.54 J
Lock J

Energy Absorbed At 40km 
 

9.46 J
Lock J

Rocker Stiffness 
 

9.3
N/A

Forefoot Rocker Stiffness Video  

Li-Ning Feidian 6 Ultra Forefoot Rocker Stiffness Video Sample

SAMPLE

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Forefoot Rocker Stiffness Graph  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Rocker Stiffness Graph
Li-Ning Feidian 6 Ultra Forefoot Rocker Stiffness Graph Sample

SAMPLE

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for pictures & test results

Force To Flatten The Rocker 
 

181 N
Lock N

Forefoot Bending Energy Return 
 

8.7
N/A

Forefoot Bending Video  

Li-Ning Feidian 6 Ultra Forefoot Bending Video Sample

SAMPLE

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Forefoot Bending Energy Return  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Bending Energy Return
Li-Ning Feidian 6 Ultra Forefoot Bending Energy Return Sample

SAMPLE

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for pictures & test results

Forefoot Bending Energy Return 
 

77.8%
Lock%

Forefoot Bending Stiffness 
 

9.6
N/A

Forefoot Bending Resistance Picture  

adidas Adizero Prime X3 STRUNG Forefoot Bending Resistance Picture
Li-Ning Feidian 6 Ultra Forefoot Bending Resistance Picture Sample

SAMPLE

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Forefoot Bending Resistance  

 Preview Graph
adidas Adizero Prime X3 STRUNG Forefoot Bending Resistance
Li-Ning Feidian 6 Ultra Forefoot Bending Resistance Sample

SAMPLE

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for pictures & test results

Forefoot Bending Stiffness 
 

43.2 N/mm
Lock N/mm

Forefoot Bending Force 
 

542 N
Lock N

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adidas Adizero Prime X3 STRUNG

Li-Ning Feidian 6 Ultra

Comments

  1. Comparison
 • Posted 1 hour ago

adidas Adizero Prime X3 STRUNG vs Li-Ning Feidian 6 Ultra: Main Discussion

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