Bell GT6 Carbon helmet with Harris Race Radios communications system installed - NZ motorsport comms

Helmet + Radio Communications Guide

Harris Race Radios Team

Helmet + Radio Communications Guide — Motorsport Comms Explained

Clear communication wins races. As qualified radio communications engineers and active racers, we've tested hundreds of helmet and comms combinations across circuit racing, rally, endurance, off‑road, Speedway, and Lemons. This guide explains how helmet design, padding, shell material, and cockpit environment affect radio clarity — and which helmets work best with which comms systems.

This guide applies to motorsport helmets only from brands including Stilo, Bell, Schuberth, Roux, Xron, MRC, Impact, and Pyrotect.

1. Why Helmet Choice Affects Radio Clarity

  • Wind noise
  • Engine and drivetrain noise
  • Breathing noise
  • Mic vibration
  • Speaker isolation

Two helmets with the same comms system can sound completely different — because the helmet is the biggest variable.

2. Open Cockpit vs Closed Cockpit Noise

Open Cockpit (Formula, Sprintcars, Karts)

  • Extreme wind noise
  • Buffeting at speed
  • Mic must be noise‑cancel type
  • Helmet must seal well around the chin

Closed Cockpit (GT, Saloon, Rally)

  • Lower wind noise
  • Higher engine/drivetrain noise
  • Mic placement becomes critical
  • Visor sealing affects clarity

Rally drivers especially need excellent noise isolation due to gravel, exhaust, and co‑driver speech.

3. Shell Material & Comms Performance

Carbon Helmets

  • Transmit less vibration to the microphone
  • Reduce low‑frequency rumble
  • Improve clarity at high speed

Composite Helmets

  • More internal resonance
  • Amplify low‑frequency noise
  • Require more careful mic placement

4. Brand‑Specific Comms Performance

  • Stilo: Best integrated comms in the world. Built‑in ports, noise‑cancel mics, excellent sealing.
  • Bell: Very good with custom mic tuning. Works well in both open and closed cockpits.
  • Schuberth: Outstanding noise isolation. F1‑level acoustic engineering.
  • Roux: Strong hydration + comms integration. Good for endurance.
  • Impact: Popular in Speedway and off‑road. Works well with high‑noise environments.
  • Pyrotect: Good value. Requires careful mic placement for best clarity.
  • Xron: Ideal for basic comms in Speedway and Lemons. Best for budget setups.

5. Microphone Types & What You Should Use

Noise‑Cancel Electret Mics

  • Best for open cockpit
  • Reject wind and engine noise
  • Used in Stilo WRC and top Bell systems

Dynamic Mics

  • Best for high‑noise environments (Speedway, off‑road)
  • Require more gain
  • Used in many Impact and Pyrotect setups

Electret Mics

  • Good for closed cockpit
  • Clear voice reproduction
  • Affordable and reliable

6. Correct Microphone Placement

  • Mic must touch or nearly touch the lips
  • Position directly in front of the mouth — not to the side
  • Ensure padding does not push the mic away
  • Use a foam wind sock in all environments

Even a 5 mm gap can reduce clarity by 40%.

7. Speaker Placement & Driver Comfort

  • Velcro‑mounted speakers
  • Foam spacers for perfect alignment
  • Low‑profile speakers for tight‑fit helmets

8. Hydration & Comms Integration

  • Stilo ST6 / WRC — industry‑leading hydration ports
  • Roux R1 — built‑in hydration system
  • Schuberth SP1 — professional endurance integration

9. Recommended Helmet + Comms Combinations

Rally

  • Stilo WRC Series
  • Schuberth SP1

Circuit / GT

  • Stilo ST6
  • Bell RS7

Endurance

  • Roux R1
  • Schuberth SP1

Speedway / Lemons

  • Xron Composite
  • Impact Vapor
  • Pyrotect Sport

Need Help Choosing the Right Helmet + Comms Setup?

We are New Zealand's motorsport communications specialists. Tell us your car, racing type, and comms system — we'll recommend the perfect helmet and install the ideal setup.

Ask a Helmet Expert

About the Author

Harris Race Radios Team — New Zealand & Australia's professional motorsport equipment specialists since 1975. Our team includes Aaron Harris, an internationally experienced racing driver and race engineer (Barcelona 24 Hour — 1st in Class 2013; Bathurst 1000 & 12 Hour competitor; BMW Race Driver Series Champion 2011; race engineer for Earl Bamber Motorsport, TekworkX, Matt Stone Racing, and Porsche Carrera Cup Australia, Asia‑Pacific & New Zealand), and Rex Harris, a qualified Radio Telecommunications Engineer and approved Radio Certifier for both New Zealand (RSM) and Australia (ACMA). Aaron is also an MSNZ Licence Examiner for helmets, racewear, and FHR/HANS devices. Read more about us →

Related Guides

← Back to the Helmet Knowledge Centre

Back to blog