Head-to-Head
Endorphin Speed 5vsAero Razor
The Endorphin Speed 5 and Aero Razor are both speed trainer shoes built for road running. The Endorphin Speed 5 retails for $175 while the Aero Razor comes in at $140 — a $35 difference. The Aero Razor is the lighter shoe at 6.9 oz versus 8.4 oz for the Endorphin Speed 5. In our ratings, the Aero Razor edges out the Endorphin Speed 5 — 8.9/10 versus 8.8/10.
| Rating | 8.8 / 10 | 8.9 / 10✓ | |
| Price | $175 | $140✓ | |
| Weight | 8.4 oz | 6.9 oz✓ | |
| Category | Speed Trainer | Speed Trainer | |
| Terrain | Road | Road | |
| Cushion | Medium | Medium | |
| Softness | Balanced | Firm | |
| Drop | Medium | Low | |
| Drop (mm) | 8 mm | 4 mm | |
| Stack | 36 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Medium | Narrow | |
| Energy Return | High✓ | High✓ | |
| Breathability | Breathable | Breathable | |
| Traction | Medium | High✓ | |
| Shock Absorption | Medium | Medium | |
| Durability | Good | Good |
