Helmet sizes are primarily determined by measuring the circumference of an individual's head, ensuring a snug and safe fit.
To accurately measure your head for a helmet, it's essential to use a flexible fabric tape measure. Helmets are designed to fit just above your eyebrows and ears, making this the ideal area to measure your head's circumference to guarantee a proper fit.
The Measurement Process
Measuring your head correctly is the first step towards finding a helmet that offers both protection and comfort.
- Locate the Correct Spot: Position the tape measure around the widest part of your head. This is typically about an inch above your eyebrows, just above your ears, and around the back of your head, where the helmet will sit most securely.
- Use the Right Tool: A flexible fabric tape measure (often found in a sewing kit) is ideal as it can conform accurately to the shape of your head. Avoid using rigid rulers or metal tape measures, which won't provide an accurate circumference.
- Ensure Accuracy: Pull the tape measure snugly, but not too tightly, around your head. Note the measurement in both centimeters and inches, as helmet manufacturers may use either unit.
Translating Measurement to Size
Once you have your head measurement, you can refer to a helmet manufacturer's sizing chart. While specific measurements can vary slightly between brands, there are general ranges that correspond to standard helmet sizes.
Here's a general example of how head circumference often correlates with helmet sizes:
| Head Circumference (cm) | Head Circumference (inches) | Helmet Size |
|---|---|---|
| 53 - 54 | 20.9 - 21.3 | XS |
| 55 - 56 | 21.7 - 22.0 | S |
| 57 - 58 | 22.4 - 22.8 | M |
| 59 - 60 | 23.2 - 23.6 | L |
| 61 - 62 | 24.0 - 24.4 | XL |
| 63 - 64 | 24.8 - 25.2 | XXL |
Important Considerations:
- Manufacturer Variation: Always check the specific sizing chart provided by the helmet brand you are considering. A "medium" in one brand might be slightly different from a "medium" in another.
- Helmet Shape: Beyond circumference, helmets also come in different internal shapes (e.g., round oval, intermediate oval, long oval). Your head's overall shape can influence which helmet brand or model provides the best fit, even if the circumference measurement is correct.
- Trying It On: Even with an accurate measurement, it's highly recommended to try on a helmet before purchasing. A properly fitted helmet should:
- Feel snug but not uncomfortably tight.
- Not move side-to-side or up-and-down when you shake your head.
- Create slight pressure evenly around your head, with no specific pressure points.
- Not block your vision.
By accurately measuring your head and understanding how these measurements translate to helmet sizes, you can significantly increase your chances of finding a helmet that offers optimal safety and comfort.
