ASICS Gel Nimbus 25 vs 26: Should You Upgrade?

Introduction

The ASICS Gel Nimbus is the brand’s premium neutral daily trainer, and version 25 marked a major redesign: away from the traditional platform and into a higher, maximal-stack, rocker-style shoe. Version 26 carries that same ride forward with only mild changes: a lighter upper, small heel geometry adjustments, and an outsole update.

So the real question is not which shoe is better, but whether the differences justify moving on from the 25, or whether sticking with the older version and buying it on sale makes more sense. Here is how they compare.

Specs: Same Ride, Slightly Different Weight

The ride platform is identical between the two versions. Both share the same stack height: 41.5mm in the heel and 33.5mm in the forefoot for men, 40.5mm and 32.5mm for women, with an 8mm drop on both.

Weight is where the 26 gives a little back. The newer version comes in at 10.7 oz for men in size 9 and 9.2 oz for women in size 8. The 25 is slightly lighter at 10.2 oz for men and 9.0 oz for women in the same sizes. That small difference is largely down to upper changes rather than the midsole, and in practice the ride itself feels the same.

Fit and Upper: The Biggest Difference

Fit is where the 26 earns its update. The 25’s forefoot, while it may look wide, feels noticeably tapered, enough to be genuinely uncomfortable if you are sensitive to toe-box pressure. The rest of the upper has a fairly standard, normal-width fit.

The 26 fixes that with a lighter upper that breathes better, feels less tapered in the forefoot, and offers a more consistent fit throughout. The heel collar and cushioning feel about the same between the two, perhaps marginally lighter in the 26, and the midfoot stays well secured in both versions.

If you found the 25’s forefoot restrictive, the 26 is a meaningful improvement. If it never bothered you, this alone may not be enough to switch.

Heel Geometry: A Subtle Smoother Transition

ASICS also made small geometry changes at the heel of the 26, slightly reducing the heel flare the brand is generally known for. The result is a rear-foot transition that feels just a little smoother than the 25.

Testing both shoes on opposite feet after proper break-in, the difference is noticeable but modest. It is a refinement, not a transformation, and it matters most to runners who are attentive to how their heel rolls through initial contact.

Outsole: Basically Unchanged

The outsole is the quietest change of the update. Traction feels about the same between the two versions, and wear is happening at a very similar rate. If you are hoping the 26 brings a durability or grip breakthrough, it does not.

Buying Advice: Upgrade or Stay Put?

Honestly, if the 25’s forefoot is not bothering you and the heel transition feels fine, there is no strong reason to upgrade. These are, for most purposes, the same shoe, and the older version on sale is the smarter buy.

The 26 makes sense if you specifically want the better-fitting, lighter, more breathable upper and the slightly smoother heel transition. Outside of those small refinements, the differences are minor.

Conclusion

The Gel Nimbus 26 is a careful refinement of a shoe that was already working. A lighter, roomier upper and a small heel tweak are real improvements, but the identical stack height, identical drop, and unchanged outsole mean the core experience is the same. Choose the 26 if fit is your priority; otherwise, grab the 25 at a discount and save the difference.