ACG Ultrafly

Trail2026-02-02 · JP · Release dateChecked 2026-10-18

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.

Key specifications

Weight

287 g

All models average 268.9 gDifference from average +18.1 g

Average of 973 models

Drop

8.5 mm

All models average 6.8 mmDifference from average +1.7 mm

Average of 986 models

Stack (heel)

37 mm

All models average 34.3 mmDifference from average +2.7 mm

Average of 810 models

MSRP

$260.00 USD · US · Tax excluded

All models average $165.57Difference from average +94.43 USD

Average of 680 models

This modelAll models average

Stack (forefoot): 28.5 mm
Carbon plate: Yes
Midsole: ZoomX
Outsole: Vibram Megagrip / Litebase
Use cases: Trail / Race

Weight notes Approximate weight per men’s shoe at 28 cm.

IN CONTEXT

Specs in context

Weight × stack788 models shown

Nike ACG Ultrafly287 g / 37 mm

Weight distribution973 models

95 g385 g

This model 287 gAll models average 268.9 gDifference from average +18.1 g

Drop distribution986 models

0 mm12 mm

This model 8.5 mmAll models average 6.8 mmDifference from average +1.7 mm

Stack distribution810 models

5 mm60 mm

This model 37 mmAll models average 34.3 mmDifference from average +2.7 mm

MSRP distribution · USD · US · Tax excluded680 models

$50.00$500.00

This model $260.00All models average $165.57Difference from average +$94.43

Unknown values are excluded. Shoe sizes and measurement conditions vary, so use these averages and distributions as a guide when comparing specifications.

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