Nike vs ASICS sizing: How do they compare?

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If you're trying to figure out how Nike and ASICS shoes compare in size, you've come to the right place.

Being two of the biggest names in sportswear, we feel it's important to know some of the similarities and differences in their sizing if, for example, you're looking to purchase some of the best running shoes around from either brand.

Fortunately, we've put together a guide to summarise all the information we could find on how the two brand's shoe's fit, using both size and width charts to determine which sneakers are best for different types of feet.


It's worth keeping in mind though that not every model, even if they're from the same brand, will fit exactly the same as the type of material and shape of the silhouette will influence how tight or loose they feel when on your feet.

With that in mind, we begin our guide by looking into how exactly your shoes should fit. So, without further delay, let's get into it...

Nike vs ASICS - How Should They Fit?

Before we compare Nike and ASICS size charts, we feel its important to know exactly how your shoes should fit to help you determine whether you're rocking the right size sneakers on your feet.

When it comes to length, Clarks recommends having about one finger's width of space between your longest toe and the end of your shoes, with the natural bend of the sneakers falling around the balls of your feet.

While this is just a generalised rule for all shoe-types, we feel it still remains applicable to most sports footwear, like some of Nike and ASICS best tennis shoes, for example.

ASICS Gel-Resolution 8 product image of a white pair of sneakers with black details next to a pair of white and light blue NikeCourt React Vapor NXTs.
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Credit: ASICS & Nike

Once you get the length, you'll then want to make sure the widest part of your foot, i.e. the ball area and metatarsal bones, fit within the widest part of your shoe with enough room so that your trainer isn't compressing your foot inwards.

To help you figure out the right size for you, check out our guide on how to measure your shoe size right here for all the information you need to make sure you're comfortable in your sneakers.

Size Guide

After establishing how both sportswear brands should fit, it's time to take a closer look at how Nike and ASICS footwear compares in terms of size.

Nike vs ASICS sneaker size chart comparison, with Nike's chart in orange and ASICS' in blue.
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Credit: Soleracks & ASICS

We can see from the two charts above that Nike and ASICS sneakers are identical in length for the most part; however, there are a few exceptions to this rule as you head towards some of the larger sizes.


For instance, when you compare a US 8 from Nike with an 8 from ASICS, you'll find the ASICS trainers equate to an EU 41.5, half an EU size larger than Nike. You'll then find an even bigger disparity if you compare a US 17 from Nike with a 17 from ASICS, which is a whole size and a half larger in EU measurements.

This is definitely worth keeping in mind when purchasing your next Nike or ASICS shoes along with the width, which is not as clear cut as comparing the length as the widths of sneakers vary depending on the model.

For instance, you'll likely find a lightweight, streamlined pair of Nike ZoomX Dragonfly track spikes to be much thinner than some of the best Air Force 1s around, a model that's renowned for its roomier fit.

Nike ZoomX Dragonfly product image of a red pair of track spikes next to all-white Air Force 1 Low '07s.
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Credit: Nike

Following on from this, we'd argue that you may find athletic trainers and sports footwear from either brand to be slightly narrower than a regular pair of shoes for everday wear.

The one exception to this you may find is the width of some of Nike's best basketball shoes, which typically come with wider outlines for a more supportive and comfortable fit on the court.


Nike vs ASICS - Which Shoes Fit Wide Feet?

On the topic of wider-fitting shoes, you may be interested in which Nike and ASICS shoes are best suited to wider feet.

As mentioned, Nike's Air Force range tends to run a little wider than some of Nike's other, narrower sneakers. One of the reasons for this is because the Air Force 1 was originally built for basketball which, as touched on above, tends to feature sneakers that run wider.

Nike offers more information on this. For example, Nike recommends wider-fitting shoes for size 8 feet that measure 3.9" or above in width.

Over at ASICS, the brand has its own width chart (see below), which runs from 2A to 4E, to help you select the right footwear for wider feet.

ASICS width chart in blue and white.
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Credit: ASICS

Both brands also offer their own selection of dedicated wide-fitting shoes. For example, Nike gives you the option of selecting an extra-wide variation of its new Air Zoom Pegasus 39s, whilst ASICS offers wide and extra-wide fits on almost its entire sneaker collection.

Nike Air Zoom Pegasus 39 product image of a pair of platinum grey sneakers with orange details.
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Credit: Nike

Nike vs ASICS - Which Shoes Run Narrow?


We've already briefly touched on the fact that athletic sports shoes tend to run slightly narrower than regular trainers for everyday wear, but which models, in particular, should you be looking out for from Nike and ASICS?

On Nike's size, the brand mentions you may find some of its Free shoes to fit a little tighter than you might expect due to internal webbing technology designed to provide a secure lock-in. You may also find some of Nike's Flyknit range fit snuggly due to the knitted mesh conforming to the shape of your feet.

For ASICS, most of its shoes seem to come with a standardised D width. However, you can also find narrow-fit variations of the GT-2000 10 and the GEL-CUMULUS 24s if narrow shoes are what you're after.

Ultimately, it looks as though both brands feature both wide and narrow-fitting trainers, so there should be shoes out there from Nike and ASICS to suit all sizes and shapes of feet.

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