Products
Tested using Methodology v0.15
Updated Jul 16, 2026 05:06 PM
SEE PRICE
R.A.D
Tested using Methodology v0.13
Updated Jul 16, 2026 05:01 PM
SEE PRICE
R.A.D
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
The R.A.D UFO and R.A.D SYNTH play two different roles in R.A.D's still-small running lineup. The UFO is the more maximal option, with a taller, softer, and more energetic platform that feels better when you want extra cushioning for longer efforts or harder steady sessions. The SYNTH goes in a more straightforward direction, with a leaner build and a more grounded ride that makes it easier to use for everyday miles and quicker turnover. The UFO brings more excitement and underfoot protection, while the SYNTH feels more controlled, simpler, and better suited to runners who want a lightweight trainer rather than a big, bouncy do-it-all shoe.
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))
Main Differences for
Half/Full Marathon Racing
Half/Full Marathon Racing
Threshold
Half/Full Marathon Racing
7.7
7.4
Forefoot Bending Energy Return
8.1
6.1
Weight
6.5
7.1
Forefoot Compression Energy Return
8.4
6.7
Forefoot Long Run Cushioning
8.2
7.0
Heel Firmness
5.5
8.2
Full Comparison
Design
Weight
6.5
7.1
Right Shoe Weight Photo
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Left Shoe Weight Photo
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Weight
247.4 g (8.73 oz)
231.1 g (8.15 oz)
Stack Heights
Stack Height Photo
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Heel Stack Height
43.4 mm
37.7 mm
Forefoot Stack Height
35.3 mm
30.3 mm
Heel-To-Toe Drop
8.1 mm
6.0 mm
Advertised Heel-To-Toe Drop
8.0 mm
7.4 mm
External Shape
3D Model Full Shoe
Preview 3D
Preview 3D
Outsole Heel Width
100 mm (3.9")
87 mm (3.4")
Outsole Arch Width
81 mm (3.2")
71 mm (2.8")
Outsole Forefoot Width
119 mm (4.7")
113 mm (4.4")
Heel Width-To-Stack Ratio
2.30
2.30
Forefoot Width-To-Stack Ratio
3.37
3.72
Internal Shape
3D Model Internal
Preview 3D
Preview 3D
Internal Length
279 mm (11.0")
271 mm (10.7")
Internal Heel Width
65 mm (2.6")
62 mm (2.4")
Internal Forefoot Width
91 mm (3.6")
90 mm (3.5")
Wide Sizing Available
No
No
Forefoot Fit: Width
8.6
9.4
Forefoot Width Photo
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Ball-Of-Foot TTS Deviation
0.1 mm (0.004")
0.3 mm (0.012")
Toe TTS Deviation
-5.3 mm (-0.209")
-3.0 mm (-0.117")
Forefoot Fit: Height
2.7
5.3
Forefoot Height Photo
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Toe TTS Deviation
-8.5 mm (-0.335")
-5.6 mm (-0.220")
Arch Fit: Width
9.8
9.0
Arch Fit Photo
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Arch Width TTS Deviation
2.5 mm (0.098")
-1.9 mm (-0.075")
Length Fit
10
10
Toe Clearance Photo
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Heel Rocker Geometry
7.2
7.3
Heel Rocker Photo
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Heel Spring
27 mm (1.1")
23 mm (0.9")
Heel Apex Position
34.7%
24.9%
Heel Rocker Angle
14.7°
17.3°
Forefoot Rocker Geometry
7.3
6.5
Forefoot Rocker Photo
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Toe Spring
50 mm (2.0")
45 mm (1.8")
Toe Apex Position
56.2%
63.0%
Forefoot Rocker Angle
21.0°
22.2°
Foam
Primary Foam Picture
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Secondary Foam Picture
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Primary Foam Name
SupeFoam
SwellFoam
Primary Foam Type
PEBA
TPEE + EVA
Secondary Foam Name
N/A
N/A
Secondary Foam Type
N/A
N/A
Laces
Laces Picture
Lace Type
Round
Width
5.0 mm (0.2")
Thickness
2.5 mm (0.1")
Stretch
10.0%
Other Features
Other Features Photo
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Tongue Gusset Type
Fully-gusseted
Fully-gusseted
Plate
None
None
Performance
Heel Compression Energy Return
8.1
4.2
Heel Compression Video
Heel Energy Return
Preview Graph
Preview Graph
Heel Energy Return
81.4%
70.8%
Forefoot Compression Energy Return
8.4
6.7
Forefoot Compression Video
Forefoot Energy Return
Preview Graph
Preview Graph
Forefoot Energy Return
83.1%
75.2%
Heel Cushioning
8.6
7.5
Heel Cushioning Picture
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Heel Cushioning
Preview Graph
Preview Graph
Energy Absorbed At 550N
4.19 J
3.44 J
Energy Absorbed At 1100N
10.28 J
9.09 J
Energy Absorbed At 1900N
17.45 J
15.53 J
Forefoot Cushioning
8.5
7.7
Forefoot Cushioning Picture
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Forefoot Cushioning
Preview Graph
Preview Graph
Energy Absorbed At 800N
5.53 J
4.65 J
Energy Absorbed At 1300N
9.27 J
8.30 J
Energy Absorbed At 2050N
13.32 J
12.35 J
Heel Firmness
5.5
8.2
Heel Firmness Graph
Preview Graph
Preview Graph
Firmness At 550N
33.0 N/mm
44.8 N/mm
Firmness At 1100N
45.1 N/mm
56.6 N/mm
Firmness At 1900N
64.8 N/mm
79.5 N/mm
Forefoot Firmness
5.8
8.5
Forefoot Firmness Graph
Preview Graph
Preview Graph
Firmness At 800N
47.8 N/mm
61.7 N/mm
Firmness At 1300N
63.7 N/mm
78.5 N/mm
Firmness At 2050N
90 N/mm
108 N/mm
Forefoot Long Run Cushioning
8.2
7.0
Forefoot Long Run Cushioning
Preview Graph
Preview Graph
Energy Absorbed At 10km
8.97 J
7.70 J
Energy Absorbed At 20km
8.84 J
7.48 J
Energy Absorbed At 30km
8.75 J
7.32 J
Energy Absorbed At 40km
8.69 J
7.20 J
Rocker Stiffness
5.9
6.5
Forefoot Rocker Stiffness Video
Forefoot Rocker Stiffness Graph
Preview Graph
Preview Graph
Force To Flatten The Rocker
58 N
71 N
Forefoot Bending Energy Return
8.1
6.1
Forefoot Bending Video
Forefoot Bending Energy Return
Preview Graph
Preview Graph
Forefoot Bending Energy Return
72.3%
60.6%
Forefoot Bending Stiffness
5.8
7.5
Forefoot Bending Resistance Picture
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Forefoot Bending Resistance
Preview Graph
Preview Graph
Forefoot Bending Stiffness
8.1 N/mm
15.4 N/mm
Forefoot Bending Force
221 N
290 N
Heel Compression Depth
7.4
Heel Compression Graph
Preview Graph
Heel Compression At 550N
16.6 mm
Heel Compression At 1100N
24.4 mm
Heel Compression At 1900N
29.3 mm
Forefoot Compression Depth
7.0
Forefoot Compression Graph
Preview Graph
Forefoot Compression At 800N
16.7 mm
Forefoot Compression At 1300N
20.4 mm
Forefoot Compression At 2050N
22.9 mm
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R.A.D UFO
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R.A.D UFO vs R.A.D SYNTH: Main Discussion
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