Nike
ACG Ultrafly Trail
Product Judgment
Strong
8.3
Category: Light/Moderate Trail
Release year: 2026
Evidence base: Extensive
Experts agree on strengths for moderate trails and energy return.
Price Judgment
Unjustified
Common retail price: ~$260
Availability: Widely Available
Based on manual research as of Aug 2, 2026
Description
Flagship ACG trail model positioned as a premium hybrid racer. Dual carbon plates and ZoomX foam set it apart in Nike's trail lineup. Widely praised for energy return, stability, and comfort on non-technical terrain.
Lively, propulsive ride with plush cushioning and strong stability. Wide platform and dual plates deliver a secure, responsive feel on open trails. Stiffness and upper ventilation limit versatility on technical or hot routes. Reliable grip and durable build support high-mileage use.
Ideal for ultramarathoners and trail runners seeking speed and comfort on gravel, fire roads, and easy to moderate trails. Suits those prioritizing energy return and long-distance protection over agility on technical ground. Best for races or training where terrain is predictable and ventilation is not critical.
Performance Scores
Comfort
8Plush ZoomX foam and roomy fit provide high comfort for long runs.
Energy Return
9Dual-density ZoomX midsole and carbon plates deliver outstanding propulsion.
Stability
8Wide platform and dual plates ensure strong stability on moderate terrain.
Durability
8Vibram Megagrip outsole and robust upper show solid wear resistance.
Grip
8Vibram Megagrip Litebase provides reliable traction on wet and loose surfaces.
Run Fitness
Daily
8Comfortable and stable for regular trail runs on mild to moderate terrain.
Long
9Cushioning and energy return excel on long distances and ultramarathons.
Light Trail
9Optimized for gravel, fire roads, and non-technical trails.
Technical Trail
6Stiffness and limited maneuverability reduce performance on technical terrain.
Door to Trail
8Handles pavement and mixed surfaces well due to cushioning and grip.
Pros & Cons
- Outstanding energy return
- Stable wide platform
- Comfortable for long runs
- Excellent grip on mild trails
- Limited breathability
- Stiff on technical trails
- Heel lockdown could be better
Dual-density ZoomX foam and carbon plates provide class-leading energy return for trail running.
Wide midsole and dual plate setup deliver strong stability on moderate terrain.
Roomy toe box and plush cushioning enhance comfort for ultramarathon distances.
Vibram Megagrip Litebase outsole ensures confident traction on wet and loose surfaces.
VaporMesh upper offers poor ventilation and slow water drainage, making it less suitable for hot or wet conditions.
Stiff ride and less maneuverability limit performance on technical, rocky, or rooty trails.
Heel lockdown can feel insecure on climbs, affecting confidence on uneven ground.
Specifications
Best for paces
5:30–7:30 min/km
Drop
8.5 mm
Stack height
38 mm heel / 29.5 mm forefoot
Weight
269 g
Drop
8.5 mm
Stack height
38 mm heel / 29.5 mm forefoot
Weight
269 g
Pronation
N/A
Width
Medium
Terrain
Light Trail
Technologies
Dual carbon plate system, ZoomX dual-density midsole, Vibram Megagrip Litebase outsole
Plate
Carbon
Best for paces
5:30–7:30 min/km
Comparable Models
Nike Pegasus Trail 5 offers a softer ride and better breathability, but less propulsion and stability.
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Altra Mont Blanc Carbon features a zero-drop platform and wider fit, but less propulsion and less stability.
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