How to Find Your Helmet Size for Bicycle Helmets
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Time to read 5 min
Wearing a helmet correctly sized for your head is critical to ensure the helmet can do its job of protecting your head, properly. So choosing the right helmet size is crucial for not just comfort but for safety. So, how does one get helmet sizing right? Here's a step-by-step guide to help you determine your ideal helmet or smart helmet size (which sizing-wise are exactly alike).
How should a helmet fit?
Before diving into measurements… how must a helmet feel on your head? How does a ‘good fit’ actually feel? When you know it is right helmet size? A properly fitted helmet with an adjusted fitting system must fit your head snuggly and allow for little motion. This doesn’t mean zero wiggle room (that is what rear fitting systems are for). In a perfect world, you want the helmet closest to your head.
The helmet must also cover an adequate portion of your head without exposing too much of your forehead (generally speaking, helmets should sit above your eyebrows). If a helmet is equipped with the Mips System, this doesn’t change the fit, but it’s important to know the Mips System is designed to allow the helmet to rotate relative to your head, even while buckled on. This is to be expected and not to be confused with a ‘loose’ helmet. With that out of the way let’s go into how to find your helmet size.
How to Measure Your Head for a Helmet
Helmet sizing uses head circumference to determine sizes, this is the total length of the ‘perimeter’ of your head. Doing this accurately is key, so be very thorough with the measurements. Here’s how you do it:
Step 1 - Gather Your Tools
A flexible measuring tape (or a piece of string and a ruler)
A mirror (optional but helpful)
Step 2 - Take Your Measurements for helmet size
Wrap the measuring tape around the circumference of your head, approximately 1 cm above your eyebrows. Ensure the tape is level and straight around your head. Tighten it gently but don’t let it get uncomfortably tight.
If you're using a string, measure it end-to-end with a ruler afterward.
Measure this a couple of times to ensure you get the right measurement. If necessary, average your measurements.
Understanding Your Helmet Size
Helmet sizes are determined by the circumference of your head, but the shape of your head also plays a role. Some Helmet Size charts (such as ours) factor head shape. So, consider whether your head is oval or round when selecting your size from the chart. If you're unsure, we recommend trying on the helmet to test the fit.
Helmet Size Chart
With your measurement in hand, refer to the AURA, NEON or FARO size chart to match your head circumference with the corresponding size. Our charts are designed to provide precise guidance, ensuring you can choose the best size for your needs.
AURA
FARO
NEON
Further Readings for Helmet Sizing
→ Pro Tips for helmet sizing
→ Why correct sizing is non-negotiable
Pro Tips for Helmet Sizing
If your measurement falls between Medium and Small, go for Small helmet size unless you usually wear long hair, in which case Medium will afford more room for adjustment.
If your measurement falls between Medium and Large, go for Medium helmet size. An open fitting system can allow for some extra room and you’ll get a fit that is more snug.
Always ensure your helmet sits level on your head, with the front edge resting just above your eyebrows for optimal protection.
Why Correct Sizing is Non-Negotiable
A correctly sized bike helmet size doesn't just protect you—it enhances your overall cycling experience. When your helmet fits well, you can ride confidently, knowing that you're protected in case of unexpected events. Use our FARO, NEON and AURA Size Finder to get the best helmet size and enjoy a safe, comfortable ride every time.
Why Choose a bike Helmet with a Visor?
When choosing the right bike helmet, it's worth considering whether it includes a visor. While a proper helmet fit is the most important factor for safety, a visor adds extra comfort and improves visibility in different riding conditions.
- Blocks sun glare for clearer vision.
- Keeps rain, dust, and insects away from your eyes.
- Helps you stay focused by reducing distractions on the road or trail.
A bike helmet with a visor is a great choice for riders who want added comfort and protection on every ride.
Further Readings about Helmet Size
→ Conclusion
→ Final Takeaways
Conclusion
Finding the right helmet size is one of the most important steps you can take to improve your safety on every ride. By measuring your head circumference, using a bike helmet size chart, and ensuring a snug, comfortable helmet fit, you'll get the protection your helmet is designed to provide.
Whether you're commuting, riding for fitness, or exploring new routes, a properly fitted helmet size gives you greater confidence and peace of mind. If you're ready to upgrade, explore UNIT 1's collection of smart bike helmets, designed to deliver advanced safety, premium comfort, and innovative technology for every ride.
Measure your head circumference accurately before choosing a bike helmet size.
Use a bike helmet size chart to find the correct helmet size.
Adjust the straps and fit system until your helmet size feels snug and secure.
Replace any helmet that has been involved in a crash or shows signs of damage.
Choose a high quality smart bike helmet that combines safety, comfort, and visibility for every ride.
Frequently Asked Questions
How do I measure my head for a bicycle helmet?
Wrap a flexible measuring tape around the widest part of your head, approximately 1 cm above your eyebrows. If you don't have a measuring tape, you can use a piece of string and measure it with a ruler.
How do I choose the right bicycle helmet size?
Once you know your head circumference, compare your measurement with the manufacturer's bike helmet size chart. Since sizing can vary between brands, always use the specific chart for the helmet you're buying.
Does head shape matter when choosing a helmet?
Yes. While helmet size is based on head circumference, head shape also affects how a helmet fits. Some size charts, including UNIT 1's, take both head size and head shape into account.
What if I'm between two helmet sizes?
If you're between Small and Medium, choose Small unless you usually wear long hair, in which case Medium offers more room for adjustment. If you're between Medium and Large, Medium is generally the recommended choice.
Why is choosing the correct helmet size important?
A properly sized bicycle helmet provides better protection and a more comfortable fit. When your helmet fits correctly, you can ride with greater confidence, knowing it's designed to protect you when you need it most.
