ASICS GEL-Nimbus 20 vs. ASICS GEL-Kayano 25 review

ASICS GEL-Kayano 25 provides comfort and stability to moderate overpronators. ASICS GEL-Nimbus 20 delivers a soft but responsive ride to neutral runners...

The ASICS GEL-Kayano 25 and the ASICS GEL-Nimbus 20 fall in two different categories of running shoes, with the ASICS GEL-Kayano 25 being a stability running shoe for overpronators and the ASICS GEL-Nimbus 20 a neutral cushioning running shoe for neutral runners and underpronators.

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The ASICS GEL-Kayano also used to serve neutral runners, but with the introduction of the ASICS GEL-Kayano 25, ASICS switched it to only serve overpronators.

Because the ASICS GEL-Kayano 25 The preceding link takes you to Amazon.com was released after the ASICS GEL-Nimbus 20, it makes use of newer technologies in its upper and in its midsole.

Both the ASICS GEL-Nimbus 20 The preceding link takes you to Amazon.com and the ASICS GEL-Kayano 25 have an upper that is quite open and that have a minimum amount of overlays.

In fact, the ASICS GEL-Nimbus 20 might have more overlays than the ASICS GEL-Kayano 25, despite the former being a neutral running shoe.

The ASICS GEL-Nimbus 20 has the ASICS logo around the midfoot that provides some support and 3D-printed overlays around the midfoot and elsewhere on the upper to provide structure where it is needed.

In addition, the mesh of the ASICS GEL-Nimbus 20 also delivers lightweight support and a more custom fit through its structure.

The upper of the ASICS GEL-Kayano 25 is meant to do the same, that is, give you a more custom fit.

Because the ASICS GEL-Nimbus 20 has overlays running around the bunion window and on the toe box, it might deliver a somewhat tighter fit in the forefoot than the ASICS GEL-Kayano 25 does, despite the fact that there are underlays in the toe box of the ASICS GEL-Kayano 25.

The ASICS logo provides some structure on the lateral side of the ASICS GEL-Kayano 25, and the area around the collar and along the saddle is closed, but most of the support you will get from the upper of the ASICS GEL-Kayano 25 comes from its internal fit system of underlays and its external heel counter at the back.

The ASICS GEL-Nimbus 20 also has an external heel counter, but the one of the ASICS GEL-Kayano 25 delivers more support around the collar than that of the ASICS GEL-Nimbus 20.

All in all, you should be able to get enough support from the upper of either running shoe to be able to stay on the running platform, with both running shoes delivering comfort in the forefoot and a good amount of support behind the heel.

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Where the ASICS GEL-Kayano 25 and the ASICS GEL-Nimbus 20 differ is in the way their midsoles have been set up.

In the past, both running shoes used to have two layers of midsole foam with GEL cushioning between the two layers in the heel and in the forefoot.

The ASICS GEL-Nimbus 20 still has that setup, but the ASICS GEL-Kayano 25 now comes with one main layer of foam in the forefoot that gets thinner as it continues to run towards the heel, and then there is a second bottom layer that runs from the midfoot to the heel.

The GEL cushioning that is sandwiched between the two layers of foam in the forefoot and that is visible on the lateral side of the ASICS GEL-Nimbus 20 is not visible on the lateral side of the ASICS GEL-Kayano 25, because the ASICS GEL-Kayano 25 now has one layer in the forefoot.

However, GEL cushioning is visible on the lateral side of the heel of both running shoes.

Lab tests indicate that the the ASICS GEL-Nimbus 20 delivers an overall soft ride to both men and women, with some minor differences between the two genders.

The ASICS GEL-Kayano 25 has been said to have a soft forefoot for both men and women, but its heel might feel firm to some male runners and moderately soft to female runners.

Both the ASICS GEL-Nimbus 20 and the ASICS GEL-Kayano 25 come with an extra 3 mm of height under their heels to take stress off the Achilles tendon of women.

This extra height does add some cushioning and thus softness to the heels of female runners.

Apart from the difference in layers and in type of midsole material used, the ASICS GEL-Kayano 25 also differs from the ASICS GEL-Nimbus 20 in that it comes with a support system on the medial side that is meant to help stop the feet of overpronators from rolling too far inward.

This support system is reinforced by a midfoot shank that connects the two sides of the midsole to deliver a good amount of stability and support right under the midfoot.

The ASICS GEL-Nimbus 20 also has a midfoot shank, but it does not connect the two sides of the midsole. However, it does help increase the stability of the ASICS GEL-Nimbus 20 without delivering any corrections.

Both the ASICS GEL-Kayano 25 and the ASICS GEL-Nimbus 20 come with a vertical flex groove in their outsole that is meant to enhance gait efficiency.

The horizontal flex grooves run differently under the two running shoes and are more uninterrupted under the ASICS GEL-Nimbus 20 than they are under the ASICS GEL-Kayano 25, but both running shoes have been found to be stiff for both genders.

The women's version of the ASICS GEL-Kayano 25 weighs approximately 9.8 oz (278 grams), and the ASICS GEL-Nimbus 20 for women weighs 8.8 oz (249 grams).

The men's version of the the ASICS GEL-Kayano 25 weighs about 11.9 oz (337 grams), and the ASICS GEL-Nimbus 20 for men weighs approximately 10.7 oz (303 grams).

Making a decision between the ASICS GEL-Kayano 25 and the ASICS GEL-Nimbus 20 should not be difficult anymore, because the ASICS GEL-Kayano 25 was made for overpronators and the ASICS GEL-Nimbus 20 for neutral runners.

The ASICS GEL-Nimbus 20 is a stable neutral running shoe but does not deliver enough stability and support for overpronators who need pronation control.

While it is unclear as to exactly how much pronation control the ASICS GEL-Kayano 25 delivers, it should be suitable for moderate overpronators.

Note: The weight of a running shoe depends on the size of the running shoe, so any weights mentioned in this review may differ from the weight of the running shoe you choose to wear. Running shoes of the same size were compared for this review.

The two links above will take you to Amazon.com where you can read more about the running shoes.


This review falls under: ASICS

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