Saucony Endorphin Speed 4 Review: The Triathlete’s Everyday Super Trainer

What to Know Before You Buy

The Saucony Endorphin Speed 4 sits in a sweet spot that very few running shoes occupy: fast enough to race in, cushioned enough to train in every day. For triathletes — who need one shoe to handle tempo sessions, long runs, and race day without constant swapping — that versatility is worth its weight in gold. The Speed 4 is the plated trainer in Saucony’s Endorphin range, sitting below the race-day Pro and above the unlasted Edge. In 2026, it’s arguably the benchmark for carbon-assisted super trainers.

Key Specs

  • Midsole — PWRRUN PB foam with an embedded nylon plate and SPEEDROLL geometry. The plate provides propulsion without the rigidity of full-carbon options, making it genuinely daily-driver comfortable.
  • Stack height — 36mm heel / 28mm forefoot, 8mm drop. Sits in the moderate-cushion category — enough for long runs, not so much that you lose ground feel at speed.
  • Weight — 232g for a men’s UK9, 213g for a women’s UK6. Lighter than most plated trainers at this cushion level.
  • Upper — Engineered mesh with a wider forefoot than previous Speed versions. Fits slightly small — size up half a size if you’re between sizes.
  • Outsole — PWRTRAC rubber compound provides excellent durability on road surfaces, matching or exceeding the lifespan of non-plated trainers.

How It Performs for Triathletes

The Endorphin Speed 4’s SPEEDROLL geometry creates an efficient toe-off that reduces the energy cost of each stride — particularly valuable when your legs are already fatigued from the swim and bike. It’s at its best between 5km and half-marathon pace, making it ideal for both race day at Olympic and 70.3 distances, and the threshold and tempo runs that build your speed. At full Ironman pace, the firmer underfoot feel can become fatiguing after 30–35km; for that distance, consider the Endorphin Pro 4 instead.

Transition-wise, the lace-up design means you’ll want to combine it with elastic laces (our guide: best elastic laces for triathlon) for faster T2 exits. It runs about a half-size small so order accordingly.

Men’s — Check price on Amazon: Saucony Endorphin Speed 4 (Men’s)

Women’s — Check price on Amazon: Saucony Endorphin Speed 4 (Women’s)

Verdict

The Saucony Endorphin Speed 4 is one of the most versatile shoes in a triathlete’s armoury. It trains well, races well from 5km to 70.3, and outlasts most super shoes in terms of mileage. If you want one shoe to cover 80% of your training and racing, this is it. Compare with our picks in the best triathlon running shoes guide 2026.

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