Adidas Adizero Boston vs Saucony Endorphin Speed
Comparing the current Adizero Boston 13 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 Adizero Boston 13 against 8 mm on the Endorphin Speed 6. Coming off the Endorphin Speed 6, the Adizero Boston 13 loads your calves and Achilles harder for the first couple of weeks. Both sit in the same role (tempo). The Adizero Boston 13 lists $15 lower.
- Adidas Adizero Boston 13Men's at AmazonWomen's
- Saucony Endorphin Speed 6Stock unverifiedMen's at AmazonWomen's
Availability last checked Aug 11, 2026. Prices and stock change without notice.
Every spec, side by side
| Spec | Adizero Boston 13 | Endorphin Speed 6 |
|---|---|---|
| FIT AND WEIGHT | ||
| Weight | 9 oz | 7.8 oz |
| Widths | D | D, 2E |
| Upper | Engineered mesh with a padded tongue and Achilles collar | Lightweight engineered mesh |
| CUSHIONING GEOMETRY | ||
| Heel stack | 36 mm | 39 mm |
| Forefoot stack | 30 mm | 31 mm |
| Drop | 6 mm | 8 mm |
| MATERIALS | ||
| Midsole | Lightstrike Pro (13.8% more than the 12) over Lightstrike 2.0 EVA | PWRRUN PBX foam |
| Plate | EnergyRods 2.0 | Redesigned nylon plate |
| VALUE | ||
| List price at launch | $160 | $175 |
Which line changes its ride more often?
The Adizero Boston has done it 2 times in 5 versions, most recently with the Adizero Boston 12 in 2023, and the Endorphin Speed has done it 3 times in 6 versions, most recently with the Endorphin Speed 6 in 2026. If you want a shoe you can rebuy without reading a review first, the Adizero Boston has the steadier record.
Buy the Adizero Boston 13
Stocked at AmazonAvailability last checked Aug 11, 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 Adidas Adizero Boston lineage and the Saucony Endorphin Speed lineage track every version and what changed in each update.
Questions runners ask
- Is the Adidas Adizero Boston or the Saucony Endorphin Speed lighter?
- The Endorphin Speed 6, by 1.2 oz in a men's US 9 (7.8 oz against 9 oz).
- Can I switch from the Adidas Adizero Boston to the Saucony Endorphin Speed?
- Yes, but ease into it. The drop moves 2 mm (6 mm on the Adizero Boston 13, 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 Adidas Adizero Boston or the Saucony Endorphin Speed?
- The Endorphin Speed 6, on stack height: 39 mm under the heel against 36 mm. Stack is not the whole story, though; the foams differ too.
- Which comes in more widths?
- The Endorphin Speed 6. The Adizero Boston 13 runs in D for men's sizes; the Endorphin Speed 6 runs in D, 2E.
- Which costs more, the Adidas Adizero Boston or the Saucony Endorphin Speed?
- The Endorphin Speed 6, by $15 at list ($160 against $175). That gap narrows once either one gets a successor.
Updated August 11, 2026.