Nike Pegasus 38 vs Pegasus 39: A Close Battle of Nike's Classic Daily Trainer

Introduction

The Nike Pegasus is one of the most popular daily trainers in the running world. Runners around the world lace them up every year, and the line has now reached its 39th iteration, which suggests Nike is doing something right. But how much actually changed between the Pegasus 38 and the Pegasus 39?

We put the two head to head across weight, lockdown, midsole, and outsole. The result is another very close battle, with the Pegasus 39 edging it 4 wins to 2 across scored categories, and a final rating of 7.28 versus 7.1. Both are solid daily trainers, but neither quite breaks through the barrier that separates good from exciting.

Weight: Half an Ounce Matters

In a men’s size 9, the Pegasus 38 weighs 9 oz, while the Pegasus 39 comes in at 8.5 oz. Losing half an ounce between iterations is a meaningful step in the right direction, and it is the clearest improvement of the update.

That said, neither number is impressive for a daily trainer. 8.5 oz is still on the heavy side, and the hope is that Nike keeps trending down toward the 8 oz mark or lower in future versions. If weight matters to you and you are choosing between the two, the Pegasus 39 has the edge.

Lockdown and Fit

Lockdown is a clear win for the Pegasus 39. The Flywire system creates a cage-like effect over the top of the foot, and Nike added extra padding to the tongue and heel counter, with a more pronounced heel flare than the 38.

The Pegasus 38 pushes back, though. Its inner gusset material is significantly better, softer to the touch and less rough, and it breathes slightly better than the 39. Fit ends as a tie and comfort leans toward the 38, but if lockdown is your priority, the 39’s improved heel counter and flare are the deciding factors.

Midsole and Ride

Both shoes use full React foam with Air Zoom pockets, but the Pegasus 39 adds an Air Zoom unit in the heel alongside the forefoot unit, which is where it pulls ahead. The ride and energy return go to the 39, and the trampoline-like feel of that heel Air Zoom pocket is reminiscent of the ASICS Novablast lineup.

Durometer readings came in fairly similar, around 41 for the 39 and 43 for the 38, though the measurement was difficult without a flat contact spot on the outsole. On the thumb press test, the year-old 38 midsole still holds up respectably, but the newer 39 takes the midsole category.

Outsole: The Pegasus 38’s Quiet Advantage

Here is where the older model fights back. Both use carbon rubber for added durability, but the Pegasus 39 adds a wider rubber patch at the heel. For heel strikers who want a more stable feel, that extra rubber may help. For forefoot strikers, it is unnecessary extra weight and material.

The Pegasus 38 also has the better decoupled groove, and the outsole score reflects it. This is the biggest step backward from the 38 to the 39, and the one change that would make the biggest difference going forward: keep the 39’s upper and midsole, but bring back the 38’s outsole.

Durability and Value

Durability predictions are essentially a tie, leaning slightly toward the Pegasus 39. Fit is a tie and comfort leans toward the 38, so the pair split those categories evenly.

On price, the Pegasus 39 launched at $130 versus $120 for the 38, reflecting inflation and shipping costs, and both are made in Vietnam. The Pegasus 38 is the previous year’s model, so discounted pricing is often available, which makes it a strong value pick for a daily trainer that is not your race shoe. Many experienced Pegasus fans deliberately buy the previous iteration for exactly this reason.

Conclusion

The final score is 7.28 for the Pegasus 39 versus 7.1 for the Pegasus 38, another very close battle. The 39 wins on weight, lockdown, and midsole ride; the 38 wins on outsole and breathability. Neither reaches the threshold that makes a shoe genuinely exciting, but the scoring trend is moving upward, and the Pegasus remains a dependable, well-loved daily trainer that runners return to year after year. Choose the 39 for the better ride and lockdown, or hunt down a discounted 38 for the outsole and value.