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Nike

ACG Ultrafly

TrailRelease date 2026-02-02JP

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

Weight
287g
Of 930 known values: 588 lower, 5 equal, 337 higher. The marker uses the midpoint of equal values.
Standard63.5th percentile (tie midpoint) / average +19g
Drop
8.5mm
Of 939 known values: 734 lower, 4 equal, 201 higher. The marker uses the midpoint of equal values.
higherUpper 21.8%, including ties / average +1.7mm
Stack (heel/forefoot)
37 / 28.5mm
Of 774 known values: 476 lower, 39 equal, 259 higher. The marker uses the midpoint of equal values.
Standard64th percentile (tie midpoint) / average +2.7mm
Carbon plate
Yes
17% of 850 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.

Prices and release dates by market

2 markets are registered. Values are shown as published for each market: no currency conversion and no guessed days or months. Reference prices are not current shop prices.

Reference prices and release dates by market
MarketReference priceRelease
United StatesUS
$260Shown aboveBefore tax
Not registered
JapanJP
¥36,080Tax incl.
2026-02-02Shown aboveGeneral release

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.

View Ultrafly Trail specsCompare both models

Compare within the database

See where these specs sit in the overall distribution. You can also compare within the same category.

Comparison: All data (1,014 shoes)

Position map

This shoeregistered average

Weight x stack height

registered average: 266g / 34.4mm (757 shoes)

The scatter plot includes only shoes with both weight and stack height registered.

Spec distributions

This shoeregistered average

Weight

This shoe 287gregistered average 268g (930 shoes)

96g383g

Drop

This shoe 8.5mmregistered average 6.8mm (939 shoes)

0mm13.8mm

Stack height

This shoe 37mmregistered average 34.3mm (774 shoes)

6mm58mm

Items with missing numeric values are excluded. Sample sizes and measurement conditions vary between models; this distribution is not a performance ranking.