- Quick Summary: Nike and ASICS generally fit similarly in terms of sizing, so most people can wear the same size in both brands. However, there are a few key differences worth knowing before you buy.
When you’re buying shoes between giants like Nike and ASICS, it's important to know key differences in sizing to avoid any disappointments.
Length, width, and overall feel aren't one-size-fits-all situations between brands, so instead of guessing, this guide breaks everything down clearly.
How Should Your Shoes Fit?
Before comparing Nike and ASICS, it's important to know what a properly fitting shoe should feel like.
First, leave about a thumb's width (roughly half an inch) of space between your longest toe and the front of the shoe. Both Clarks and ASICS recommend leaving a little extra room to help prevent discomfort while walking or running.
Next, check where the shoe bends. The flex point should line up with the ball of your foot. If it bends too far forward or behind, the shoe isn't the right fit for your foot.
Finally, pay attention to width. The widest part of your foot should sit comfortably in the widest part of the shoe. As mentioned in our Nike and adidas sizing comparison, if your toes feel cramped or your foot spills over the sides of the midsole, you should consider a wider fit.
Nike vs ASICS Size Chart Comparison
The biggest difference between Nike and ASICS is the way they measure shoe length.
For example, an ASICS men's US size 9 is listed at 27 cm, while Nike lists the same size at 26.2 cm. On paper, that makes the ASICS shoe approximately 0.8 cm longer.
In reality, though, the difference is rarely noticeable. Both brands use slightly different sizing methods, and most people can comfortably wear the same size in each.
- Verdict: Stick with your normal size unless you've previously found one brand consistently fits too long or too short.
Nike vs ASICS Width Comparison
Width is where the two brands differ the most.
ASICS offers one of the broadest width selections in the industry, using width codes to accommodate different foot shapes. While the company doesn't publish exact width measurements, approximate dimensions are available online.
For a men's US size 8, the widths are approximately:
- B - Approx. 8.73cm
- D - Approx. 9.68cm
- 2E - Approx. 10.64cm
- 4E - Approx. 11.59cm
Nike also produces wide-fit shoes, but its selection is more limited. Rather than emphasizing width codes across its lineup, Nike typically recommends wide or extra-wide models based on foot measurements.
One thing to keep in mind is that shoe width naturally increases with shoe size. For example, a men's US size 12 in a standard width will be noticeably wider than a men's US size 6 in the same width category.
Which Shoes Fit Wide Feet Best?
Both brands make shoes for wider feet, but ASICS offers more options overall.
Nike
Several Nike models have a naturally roomier fit than others.
The Nike Air Force 1 is a longtime favorite thanks to its spacious basketball-inspired design. Runners looking for extra room can also consider the Nike Pegasus 42, which is available in an extra-wide version.
Nike recommends choosing a wide shoe if your foot measures more than 3.9 inches (9.9 cm) across at a men's US size 8.
ASICS
ASICS offers many of its running shoes in both 2E (Wide) and 4E (Extra Wide), making it one of the best brands for runners with wider feet.
If you've struggled to find comfortable shoes because of your foot width, ASICS is usually the safer choice.
- Verdict: ASICS offers a more comprehensive range of width options and is generally the better brand for wide feet.
Which Shoes Run Narrow?
If you have narrow feet, both brands have options, although Nike tends to fit slimmer by default.
Narrow Nike Shoes
Several Nike collections are known for their snug fit, including:
The Nike Free line fits closer to the foot because of its internal support system, while Flyknit shoes wrap the foot with a stretchy knit upper that creates a sock-like feel.
Narrow ASICS Shoes
Most ASICS shoes come in a standard D width for men, but many models are also available in narrower B or 2A widths, making it easier to get a more precise fit if standard shoes feel too roomy.
Final Thoughts
Choosing between Nike and ASICS ultimately comes down to your foot shape more than the size printed on the box.
Here's the quick takeaway:
- Length: ASICS generally run slightly longer, but most people can wear the same size in both brands.
- Width: ASICS offers a much wider selection of narrow, standard, wide, and extra-wide fits.
- Overall fit: Nike shoes generally have a slimmer profile, particularly models like the Free and Flyknit lines.
If you have average-width feet, either brand should fit well in your usual size. If you have especially wide feet, however, ASICS' broader range of width options gives it a clear advantage.
Stay tuned to RealSport101 for more shoe sizing guides and content.