ACG Ultrafly
Nike ACG Ultrafly is the second-generation super shoe for long trail races. Its full-length carbon-fiber FlyPlate is less rigid than the original Ultrafly and uses a split spine to flex over roots and rocks. ZoomX foam pairs with Vibram Megagrip and Litebase for propulsion and traction, while a wider forefoot and heel, trail-specific last, and drainage-focused upper support long efforts across varied terrain.
- Intended uses:
- Trail, Race
Specs
Among 865 listed shoes, this is a heavier Trail
- Weight
- 287g
- Of 811 known values: 531 lower, 3 equal, 277 higher. The marker uses the midpoint of equal values.
- heavierUpper 34.5%, including ties / average +20g
- Drop
- 8.5mm
- Of 815 known values: 646 lower, 4 equal, 165 higher. The marker uses the midpoint of equal values.
- higherUpper 20.7%, including ties / average +1.7mm
- Stack height (heel/forefoot)
- 37 / 28.5mm
- Of 694 known values: 414 lower, 35 equal, 245 higher. The marker uses the midpoint of equal values.
- Standard62.2th percentile (tie midpoint) / average +2.3mm
- Carbon plate
- Yes
- 17% of 786 known models have carbon plates
- Midsole
- ZoomX
- Outsole
- Vibram LITEBASE
- Reference price
- $260
- US price
Weight measurement and plate details
- Weight note
- 287g in men's US 10 from Nike official ACG Ultrafly release article; Japanese official news did not state weight.
- Plate note
- Nike Japan official news confirms a carbon-fiber Flyplate combined with ZoomX foam and Vibram LITEBASE outsole.
Changes from the previous model
A comparison with the registered values for Nike Ultrafly Trail.
In the registered data, weight is 13g lighter at 287g, heel stack is 1.5mm lower at 37mm, and forefoot stack is 1.5mm lower at 28.5mm.
These are differences between registered values, not a controlled comparison at the same size and measurement conditions. See the notes below the specs for weight conditions.
Compare within the database
See where these specs sit in the overall distribution. You can also compare within the same category.
Comparison: All data (865 shoes)
Position map
Weight x stack height
registered average: 265g / 34.7mm (686 shoes)
The scatter plot includes only shoes with both weight and stack height registered.
Spec distributions
Weight
This shoe 287g·registered average 267g (811 shoes)
Drop
This shoe 8.5mm·registered average 6.8mm (815 shoes)
Stack height
This shoe 37mm·registered average 34.7mm (694 shoes)
Items with missing numeric values are excluded. Sample sizes and measurement conditions vary between models; this distribution is not a performance ranking.