Saucony Endorphin Speed 4 Review

· Overview

The Saucony Endorphin Speed 4 is a nylon-plated speed shoe designed for road runners seeking a lightweight, responsive trainer that bridges the gap between daily training and race-day performance. This shoe is best suited for tempo runs, intervals, and half-marathon distances where you want a fast feel without the stiffness of a full carbon plate.

· Key Specs

• +Discipline: Road
• +Drop: 8mm
• +Weight: 228g (men's size 9 / EU 43)
• +Stack height (heel): 39mm
• +Stack height (forefoot): 31mm
• +Carbon plate: No
• +Rock plate: No
• +Price: $165 AUD
• +Tagline: Nylon-plated speed shoe that runs faster than its price tag

· Performance

Grip/Traction: The outsole uses PWRTRAC rubber—a slightly tacky compound borrowed from trail shoes—which delivers reliable grip on dry and damp asphalt. On wet painted lines or smooth concrete, you get moderate slip, but it’s not a dealbreaker. The rubber coverage is conservative: exposed midsole foam under the medial arch and lateral heel reduces weight, but you lose traction on loose gravel or uneven pavement. For pure road use, the grip is solid; for mixed surfaces, look elsewhere.

Cushion/Feel: The midsole stacks PWRRUN PB (a nitrogen-infused PEBA foam) with a S-curve nylon plate that acts as a stabiliser and springboard. The ride is firm but not harsh—think a 7/10 on softness—with a pronounced forefoot rocker that encourages a midfoot strike. At 228g, the shoe feels light underfoot, and the plate adds a snappy response on toe-off without the aggressive stiffness of carbon. The 39mm heel stack offers ample protection for longer efforts, but the forefoot (31mm) feels slightly muted for hard intervals under 5K pace. The dampening is best for sustained tempo efforts (10K to half-marathon pace).

Fit/Stability: The engineered mesh upper is single-layer with targeted overlays at the lace eyelets and heel collar. The fit is true to size for narrow to medium feet; wide-footed runners may experience pressure at the midfoot due to the internal plate’s shaping. The heel lock is secure thanks to an external heel counter and internal padding that does not irritate the Achilles. Stability is average: the high stack and narrow heel base allow slight medial roll for neutral runners. Overpronators may feel unstable at faster paces. The internal volume is low—the toebox tapers more than previous Speed versions, so expect snugness in the forefoot.

Durability: The PWRTRAC rubber is 60–70% coverage, which is fair for a speed shoe. After 80km of mixed road running, the front lateral rubber shows pilling, while the exposed foam under the arch has minor scuffing. The upper shows no fraying. Expect 500–600km before the midsole loses its pop—better than most carbon-plated shoes but less than daily trainers like the Asics Gel-Nimbus. For $165 AUD, the durability-per-dollar ratio is reasonable for a speed-focused shoe.

· Who It’s For

The Endorphin Speed 4 is for road runners who want a nimble, snappy shoe for faster training sessions—think 5K to half-marathon pace. It suits neutral to mild overpronators with narrow to medium feet who prioritise ground feel and responsiveness over pillow-soft cushion. If you’re racing a 10K or working on stride turnover, this shoe delivers a natural ride that carbon-plated shoes can’t match. It’s also a great option if you’re balking at the $200+ price of carbon racers.

· Who Should Look Elsewhere

Avoid this shoe if you have wide feet, overpronate heavily, or need maximum cushion for marathon-distance training. The forefoot taper and moderate heel stability make it uncomfortable for slow recovery runs or long, easy efforts. Also skip it if you want a true race-day flat: the 39mm stack is high for 5K racing, and the nylon plate lacks the aggressive stiffness of carbon for sharp turns or all-out sprints.

· Verdict

The Saucony Endorphin Speed 4 nails its niche: a lightweight, nylon-plated trainer that’s faster than most daily shoes but more forgiving than carbon racers. The grip is solid for road use, the ride is snappy without being jarring, and the fit is precise for neutral runners. Durability is average, but the $165 AUD price undercuts competitors like the Nike Vaporfly or Asics Magic Speed. It’s not a one-shoe quiver for slow or wide-footed runners, but for tempo work and short races, it deserves a spot in your rotation. RunningGearDB score: 8.6/10

· FAQ

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