New Balance FuelCell Rebel vs Saucony Endorphin Speed
Comparing the current FuelCell Rebel v5 and Endorphin Speed 6. Specs are men's US 9.
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THE SHORT ANSWER
Drop is the real difference: 6 mm on the FuelCell Rebel v5 against 8 mm on the Endorphin Speed 6. Coming off the Endorphin Speed 6, the FuelCell Rebel v5 loads your calves and Achilles harder for the first couple of weeks. Both sit in the same role (tempo). The FuelCell Rebel v5 lists $35 lower.
- New Balance FuelCell Rebel v5Men's at AmazonWomen's
- Saucony Endorphin Speed 6Stock unverifiedMen's at AmazonWomen's
Availability last checked Oct 14, 2026. Prices and stock change without notice.
Every spec, side by side
| Spec | FuelCell Rebel v5 | Endorphin Speed 6 |
|---|---|---|
| FIT AND WEIGHT | ||
| Weight | 7.9 oz | 7.8 oz |
| Widths | D, 2E | D, 2E |
| Upper | FantomFit race mesh with a gusseted, padded tongue | Lightweight engineered mesh |
| CUSHIONING GEOMETRY | ||
| Heel stack | 35 mm | 39 mm |
| Forefoot stack | 29 mm | 31 mm |
| Drop | 6 mm | 8 mm |
| MATERIALS | ||
| Midsole | Soft-tuned PEBA-and-EVA blend FuelCell foam | PWRRUN PBX foam |
| Plate | None | Redesigned nylon plate |
| VALUE | ||
| List price at launch | $140 | $175 |
Which line changes its ride more often?
Both lines rework the ride about as often: the FuelCell Rebel has done it 3 times in 5 versions, most recently with the FuelCell Rebel v4 in 2024, and the Endorphin Speed has done it 3 times in 6 versions, most recently with the Endorphin Speed 6 in 2026. Neither is the safer long-term rebuy on this record.
Buy the FuelCell Rebel v5
Stocked at AmazonAvailability last checked Oct 14, 2026.
Buy the Endorphin Speed 6
Stock unverifiedAvailability last checked Jul 31, 2026.
Chasing a specific older version rather than choosing between the current two? The New Balance FuelCell Rebel lineage and the Saucony Endorphin Speed lineage track every version and what changed in each update.
Questions runners ask
- Is the New Balance FuelCell Rebel or the Saucony Endorphin Speed lighter?
- Neither, meaningfully. The FuelCell Rebel v5 and the Endorphin Speed 6 both weigh about 7.9 oz in a men's US 9.
- Can I switch from the New Balance FuelCell Rebel to the Saucony Endorphin Speed?
- Yes, but ease into it. The drop moves 2 mm (6 mm on the FuelCell Rebel v5, 8 mm on the Endorphin Speed 6), which changes where your foot loads at landing. Give it two weeks of easy running before a hard session.
- Which is more cushioned, the New Balance FuelCell Rebel or the Saucony Endorphin Speed?
- The Endorphin Speed 6, on stack height: 39 mm under the heel against 35 mm. Stack is not the whole story, though; the foams differ too.
- Which costs more, the New Balance FuelCell Rebel or the Saucony Endorphin Speed?
- The Endorphin Speed 6, by $35 at list ($140 against $175). That gap narrows once either one gets a successor.
Updated October 14, 2026.