Step 02 — The lineup
6 shoes scored across eleven metrics · Any purpose
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Adidas Racer TR21 — Adidas Racer TR21: 34 mm heel stack, 8 mm drop, 318 g — specs from independent lab testing.
Sizing note
Everything here fits true to size. Leave a thumbnail of space at the toe.
Durability
Expect roughly 350 miles before the midsole flattens out.
Step 03 — Every metric
| Metric | Asics Gel Hyper Speed 6 | Asics Hyper Speed 4 | Adidas Duramo Speed | On Cloud X 4 | Brooks Launch 12(2025) | Adidas Adizero RC 5 | On Cloud 6(2025) |
|---|---|---|---|---|---|---|---|
| Weight | 218 g / 7.7 oz | 210 g / 7.4 oz | 240 g / 8.5 oz | 250 g / 8.8 oz | 245 g / 8.6 oz | 210 g / 7.4 oz | 245 g / 8.6 oz |
| Drop | 7 mm | 7 mm | 9 mm | 7 mm | 8 mm | 8 mm | 8 mm |
| Stack (heel) | 29 mm | 32 mm | 30 mm | 30 mm | 32 mm | 28 mm | 30 mm |
| Cushioning | |||||||
| Flexibility | |||||||
| Stability | |||||||
| Rocker geometry | |||||||
| Energy return | |||||||
| Responsiveness | |||||||
| Toe-box | Standard | Standard | Standard | Standard | Standard | Standard | Standard |
| Plate | — | — | — | — | — | — | — |
| Intended pace | 5:45–7:45 /mi | 5:45–7:45 /mi | 7:15–9:45 /mi | 7:30–10:00 /mi | 7:30–10:00 /mi | 6:15–8:30 /mi | 8:30–11:30 /mi |
| Purpose | Tempo, Race day | Tempo, Race day | Daily, Tempo | Daily, Tempo | Daily, Tempo | Tempo, Race day | Daily |
| Sizing | True to size | True to size | True to size | True to size | True to size | True to size | True to size |
| Durability | ~250 mi | ~250 mi | ~400 mi | ~350 mi | ~400 mi | ~300 mi | ~400 mi |
| Price | $90 | $100 | $100 | $150 | $110 | $90 | $150 |
Your reference shoe is shown first for context. Cushioning, flexibility and stability are rated 1–5.