Step 02 — The lineup
6 shoes scored across eleven metrics · Any purpose
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Nike ACG Mountain Fly 2 Low — Rugged all-mountain cruiser with React foam and sticky rubber.
Sizing note
Everything here fits true to size. Leave a thumbnail of space at the toe.
Durability
Plated models here average ~300 mi; non-plated land closer to ~440 mi.
Step 03 — Every metric
| Metric | Nike Ultrafly | Nike Ultrafly Trail | On Cloudsurfer Trail 2 | Under Armour Infinite Pro | Saucony Ride TR 3 | Salomon S/Lab Ultra 4 | Nike ACG Pegasus Trail(2026) |
|---|---|---|---|---|---|---|---|
| Weight | 286 g / 10.1 oz | 275 g / 9.7 oz | 287 g / 10.1 oz | 300 g / 10.6 oz | 280 g / 9.9 oz | 265 g / 9.3 oz | 286 g / 10.1 oz |
| Drop | 8 mm | 8 mm | 8 mm | 8 mm | 8 mm | 8 mm | 8 mm |
| Stack (heel) | 36 mm | 39 mm | 34 mm | 36 mm | 36 mm | 36 mm | 35 mm |
| Cushioning | |||||||
| Flexibility | |||||||
| Stability (5 = most guidance) | |||||||
| Rocker geometry | |||||||
| Energy return | |||||||
| Responsiveness | |||||||
| Toe-box | Standard | Standard | Standard | Standard | Standard | Standard | Standard |
| Plate | — | Carbon | — | Rock | — | Rock | — |
| Intended pace | 7:30–10:30 /mi | 7:30–10:30 /mi | 9:00–12:00 /mi | 8:30–11:30 /mi | 9:00–12:00 /mi | 8:00–11:30 /mi | 8:30–11:30 /mi |
| Purpose | Trail, Race day | Trail, Race day | Trail, Daily | Trail, Daily | Trail, Daily | Trail, Long run, Tempo | Trail, Daily |
| Sizing | True to size | True to size | True to size | True to size | True to size | True to size | True to size |
| Durability | ~300 mi | ~300 mi | ~400 mi | ~450 mi | ~450 mi | ~450 mi | ~450 mi |
| Price | $240 | $260 | $170 | $135 | $140 | $200 | $155 |
Your reference shoe is shown first for context. Cushioning, flexibility and stability are rated 1–5, where 5 stability means the most guidance and 1 means fully neutral.