Choosing the right sneakers, especially between top athletic brands like Nike and ASICS, can be tricky due to subtle differences in fit, length, and width. This comprehensive guide simplifies your decision by breaking down Nike vs ASICS sizing, including differences in shoe length, width options, and fit characteristics for both narrow and wide feet.
How Should They Fit?
Before diving into the Nike vs ASICS size comparison, it's essential to understand what a properly fitting shoe looks and feels like.
- Toe Room: Experts like Clarks recommend leaving about one finger’s width of space between your longest toe and the end of the shoe (as does ASICS itself).
- Foot Bend: The shoe should bend where your foot naturally does—across the balls of your feet.
- Width Fit: Ensure the widest part of your foot (including the metatarsals) aligns with the shoe’s widest area to avoid discomfort or compression.
Nike vs ASICS Size Chart Comparison
Let’s explore how Nike and ASICS shoes compare in length and sizing:
- A Men’s US size 9:
- ASICS measures 27 cm
- Nike measures 26.2 cm
While ASICS shoes run slightly longer by about 0.8 cm, this small difference typically doesn’t require you to size up or down. You can usually purchase the same size in both brands confidently.

Nike vs ASICS Width Comparison
For width, ASICS, like many brands, uses codes to indicate when wide or extra-wide trainers are required. However, they do not specify the exact width of each code in centimeters (see below).

However, this information can be found online. Here is a breakdown of the codes for a Men's US 8 shoe:
- B - Approx. 8.73cm
- D - Approx. 9.68cm
- 2E - Approx. 10.64cm
- 4E - Approx. 11.59cm
Nike also provides a width chart (see below). It goes into a little more detail, indicating when a shoe is considered a wide fit (e.g., a Men’s US 10 with a foot width of 4.2 inches (10.67 cm) is classified as wide).

Which Shoes Fit Wide Feet Best?
For wide feet, both Nike and ASICS offer solid options:
Nike for Wide Feet
- Nike Air Force 1: Naturally wider due to its original basketball design and heritage.
- Nike Pegasus 41: Available in extra-wide fit as well as other top Nike trainers.
Note: Nike suggests wide shoes if your size 8 foot measures over 3.9 inches (9.9 cm) in width.
ASICS for Wide Feet
- Most ASICS models offer 2E (wide) and 4E (extra-wide) options.
- The ASICS width range caters to a broader foot spectrum than Nike’s standard offerings.
Which Shoes Run Narrow?
If you have narrow feet, here’s what to watch for:
Narrow Nike Shoes
- Nike Free range: Tighter fit due to internal webbing.
- Nike Flyknit models: Snug fit from stretch-knit materials.
Narrow ASICS Shoes
- While most ASICS come in standard D width, some models are also available in narrow (B or 2A) options.
Final Thoughts: Nike vs ASICS Sizing
When it comes to Nike vs ASICS sizing, here’s a quick takeaway:
- Length: ASICS generally runs slightly longer.
- Width: ASICS offers more detailed width options (from 2A to 4E).
- Fit: Nike may fit narrower, especially in specific models like Flyknit or anything from the Free range.
Both brands cater to a wide range of foot shapes and performance needs, making it possible to find a comfortable, well-fitting pair no matter your preference.