How to Choose the Right Size Bike Helmet
How to Choose the Right Size Bike Helmet: Measuring & Fit Guide
Choosing the right size bike helmet starts with one simple measurement: the circumference of your head. Measure around your head approximately 2.5 cm above your eyebrows, compare that number with the helmet's size chart, and then use the helmet's retention system and straps to fine-tune the fit.
A properly sized helmet should sit level on your head, feel secure without uncomfortable pressure points, and stay in position when you move your head.
How to choose your bike helmet size:
- Measure the circumference of your head approximately 2.5 cm above your eyebrows.
- Compare your measurement with the size chart for the specific helmet.
- Put the helmet on and fine-tune the retention system and straps until the helmet sits securely and comfortably.
Different types of cycling helmets may prioritize different features. Mountain bike helmets often provide additional coverage, road helmets may focus on low weight and ventilation, commuter helmets can include urban-friendly features, and kids' helmets are designed with younger riders in mind.
No matter which style you choose, getting the correct size and fit is an important first step.
How Do You Measure Your Head for a Bike Helmet?
Use a flexible tailor's tape to measure around the widest part of your head, approximately 2.5 cm above your eyebrows and just above your ears.
Keep the tape level around your head and snug without pulling it tightly into your skin. Record the measurement in centimeters.
If you don't have a flexible measuring tape, wrap a piece of string or a shoelace around your head and then measure the length with a ruler or traditional tape measure.
Measure a second time to make sure you get the same result. Measure twice, order once.
How Do You Choose the Right Lazer Helmet Size?
Once you know your head circumference, compare the measurement with the size chart for the specific Lazer helmet you're considering.
Helmet sizing can vary by model, so always check the size information listed on that helmet's product page rather than assuming you wear the same size in every helmet.
For many adult Lazer road, urban, and mountain bike helmets, current sizing falls within ranges such as Small, Medium, Large, and Extra Large. Some models are also available in a Unisize option.
You can also review the Lazer Helmet Size Chart before ordering.
What If You're Between Two Bike Helmet Sizes?
If your head circumference falls within the overlap between two Lazer helmet sizes, Lazer recommends considering the smaller size.
The helmet's adjustable retention system provides additional range for fine-tuning the fit. However, head shape and personal comfort also matter, so the helmet should never feel excessively tight or create uncomfortable pressure points.
If possible, try both sizes and choose the one that feels secure and comfortable while sitting correctly on your head.
How Should a Bike Helmet Fit?
Once you've selected the correct helmet size, the next step is adjusting the helmet so it sits properly on your head.
- Position: The helmet should sit level on your head rather than tilted far back or forward.
- Forehead coverage: The front edge should sit around eyebrow level.
- Retention system: Tighten the fit system until the helmet feels secure without creating uncomfortable pressure.
- Side straps: The straps should sit close to your cheeks and route around your ears.
- Chin strap: Adjust the buckle so the strap is snug while still allowing you to comfortably open your mouth.
When adjusted correctly, the helmet should remain securely positioned when you gently move your head from side to side.
Fine-Tune Your Helmet with the Lazer Retention System
Lazer helmets use adjustable retention systems to fine-tune the fit once you've selected the appropriate helmet size.
Different Lazer helmet models use different retention-system designs depending on how the helmet is intended to be used.
These systems are designed to distribute retention pressure around the head rather than concentrating it in only a few areas, helping provide a secure and comfortable fit.
Remember that the retention system is there to fine-tune the fit. It should not be used to compensate for a helmet shell that is fundamentally too large or too small.
How Do You Know If a Bike Helmet Is Too Big?
A bike helmet may be too large if it moves excessively even after the retention system is adjusted, slides down over your eyes, or shifts significantly from side to side.
If you have to tighten the retention system to its limit just to keep the helmet in place, you may need to try a smaller size.
How Do You Know If a Bike Helmet Is Too Small?
A helmet may be too small if it feels uncomfortably tight before the retention system is adjusted, creates noticeable pressure points, or does not sit fully and level on your head.
A properly fitted helmet should feel secure, but it shouldn't cause discomfort.
Quick Bike Helmet Fit Checklist
- Head circumference matches the helmet's stated size range.
- Helmet sits level on the head at approximately eyebrow height.
- Retention system is snug without creating pressure points.
- Helmet does not shift significantly when you move your head.
- Side straps sit close to the cheeks and around the ears.
- Chin strap is secure but still allows comfortable jaw movement.
Lazer's 60-Day Satisfaction Guarantee
Sometimes the best way to know whether a helmet works for your head shape is to put it on.
If your new Lazer helmet doesn't meet your expectations, Lazer's 60-Day Satisfaction Guarantee allows qualifying customers to return the helmet within 60 days of the original purchase date.
That gives you an opportunity to make sure the size, shape, and fit work for you before settling on your new helmet.
