Helmet Fit & Sizing Guide
Harris Race Radios TeamA well-fitting motorsport helmet is essential to protection, comfort and clear communications. This guide covers measuring and assessing fit across the helmet brands we carry, including Stilo, Bell, Schuberth, Roux, XRON, Impact and Pyrotect. Fit varies by model, not just the size printed on the label.
Why Helmet Fit Matters
- Protection: A loose helmet may move or rotate in an impact.
- Comfort: Localised pressure can cause pain and distraction.
- Comms: Helmet and ear-cup fit affect microphone and speaker placement.
The helmet is the critical component in a motorsport communications setup; match it to both the driver and the radio/intercom requirements.
Measure Your Head
Use a soft tape just above the eyebrows, around the widest part of the head and level at the back. Record the result in centimetres. Compare it with the current chart for the specific helmet model; two brands in the same nominal size need not fit alike.
What a Good Fit Feels Like
- Firm, even contact without a painful pressure point
- Secure cheek and crown contact with minimal independent movement when you gently move the helmet
- A correctly fastened chin strap and unobstructed vision in driving position
- Comfort during a longer trial, rather than just the first few seconds
Do not buy a loose helmet to avoid a pressure point. The shell shape may be wrong even if the circumference looks right.
Head Shape and Brand Differences
Round, intermediate and long-oval heads can need different shell shapes. Stilo, Bell, Schuberth, Roux, Impact, XRON and Pyrotect models should be assessed individually; a single brand-wide shape claim is not a substitute for a trial fit. Start with the manufacturer's chart and check the particular model.
Cheek Pads and Fit Adjustments
Where available for a specific helmet, compatible cheek or crown pads can fine-tune its fit. They cannot turn a wrong-size or wrong-shape shell into a properly fitting helmet. Ask us to check pad compatibility rather than assuming components fit every model.
A Practical Fit Check
- Put the helmet on according to its manufacturer's instructions and fasten the chin strap.
- Check even contact, view through the visor and cheek position.
- Gently move the helmet; it should not rotate freely around your head.
- Wear it for several minutes to identify pressure points.
- Check fit in your seated driving position, including any required communications equipment.
Standards, Condition and Replacement
Check the helmet's actual FIA or Snell label, condition and model against current MotorSport NZ Schedule A, Motorsport Australia and the rules of the specific category or event. SA2025 is the current Snell motorsport standard in NZ and AU, subject to category and event requirements. A label does not guarantee acceptance everywhere, and no member of our team approves helmets on behalf of MotorSport NZ.
Replace a helmet after a significant impact in accordance with manufacturer guidance, or if damage, wear or fit changes make it unsuitable. Standards and event eligibility change: do not rely on a universal five- or ten-year replacement rule.
Frequently Asked Questions
How do I know whether a motorsport helmet fits?
Check firm, even contact, a secure strap, minimal independent movement and no painful pressure points after wearing it for several minutes.
What head measurement should I use?
Measure circumference just above the eyebrows and around the widest part of your head in centimetres, then compare with the current chart for the exact model.
Do all helmet brands fit the same?
No. Fit differs between models and brands; head shape matters as well as circumference.
Are all your helmets automatically approved for NZ and AU motorsport?
No. Check the exact helmet's FIA or Snell homologation and condition against current MotorSport NZ, Motorsport Australia and relevant event rules for your category.
When should I replace a helmet?
Follow the manufacturer's impact and condition guidance, and check current event eligibility; there is no universal age-based rule for every helmet.
About Harris Race Radios
We supply a broad motorsport helmet range because the helmet must suit the driver, discipline and communications system. Rex Harris is a qualified Radio Telecommunications Engineer and Approved Radio Certifier, RSM ARC127 and ARE127; that radio role does not certify helmets. Aaron Harris is an active racing driver, race engineer and MotorSport NZ Licence Examiner for licences. His licence-examiner role does not include examining or certifying helmets, racewear, FHR or HANS devices. Contact Aaron at +64 27 449 9654 or aaron@harriscomms.co.nz.
Tell us your head measurement, racing category, helmet model and communications needs; we can help you compare suitable options. Contact us online.