
Adidas Adizero Boston 12
8.9 Very GoodLeave Endorphin Speed 5 for Adizero Boston 12 when faster / more responsive outweighs the source’s tempo runs / intervals bias. Adizero Boston 12 centres on tempo runs / daily training. You give up Endorphin Speed 5 spec (drop 8, heel stack 36, weight 227, midsole PWRRUN PB).
Read review →Better than Endorphin Speed 5
- Leave Endorphin Speed 5 for Adizero Boston 12 when more speed outweighs the source’s tempo runs / intervals bias. Adizero Boston 12 centres on tempo runs / daily training. You give up Endorphin Speed 5 spec (drop 8, midsole PWRRUN PB, cushion feel balanced, stability neutral).
- Adizero Boston 12 advantage: dual Running + HYROX relevance
- Also stronger on: responsive tempo ride
What you give up
- You leave behind Endorphin Speed 5's versatile plated workout shoe
- Adizero Boston 12 downside: not a max-cushion easy shoe
- Only switch if overkill for easy recovery jogs is a real problem — otherwise faster / more responsive is optional
Who should switch
Move to Adizero Boston 12 if overkill for easy recovery jogs is the reason you opened this page and dual Running + HYROX relevance actually fixes it.
Who should stay with Endorphin Speed 5
Keep Endorphin Speed 5 if Nylon-plated tempo shoe for workouts, faster long runs, and accessible race efforts. is still the honest match and you would only use Adizero Boston 12's faster / more responsive edge rarely.
Best for
- Shopping a road (or treadmill) tool and can keep trail or race-day jobs in other shoes when.
- Dual Running + HYROX relevance.
- Responsive tempo ride.








