Head-to-Head
Endorphin Speed 5vsGlycerin Flex
The Endorphin Speed 5 is a speed trainer shoe while the Glycerin Flex is a daily trainer shoe. The Endorphin Speed 5 retails for $175 while the Glycerin Flex comes in at $170 — a $5 difference. The Endorphin Speed 5 is the lighter shoe at 8.4 oz versus 9.1 oz for the Glycerin Flex. In our ratings, the Endorphin Speed 5 edges out the Glycerin Flex — 8.8/10 versus 8.0/10.
| Rating | 8.8 / 10✓ | 8.0 / 10 | |
| Price | $175 | $170✓ | |
| Weight | 8.4 oz✓ | 9.1 oz | |
| Category | Speed Trainer | Daily Trainer | |
| Terrain | Road | Road | |
| Cushion | Medium | Medium | |
| Softness | Balanced | Balanced | |
| Drop | Medium | Medium | |
| Drop (mm) | 8 mm | 6 mm | |
| Stack | 36 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Medium | Narrow | |
| Energy Return | High✓ | Low | |
| Breathability | Breathable✓ | Medium | |
| Traction | Medium | High✓ | |
| Shock Absorption | Medium | High✓ | |
| Durability | Good | Good |
