Global Helmet Intelligence Platform

GMax · AT-21S

GMax AT-21S

ESPECIFICACIÓN TÉCNICA VERIFICADA Adventure/Dual Sport ECE 22.06, DOT Polycarbonate 1650g
CAD ARCHITECTURE BLUEPRINT

Empirical Geometry Profile · Verified Laboratory Cataloging

Quick Facts at a Glance

Category Adventure/Dual Sport
Certifications ECE 22.06, DOT
Measured Weight 1650 g
Shell Material Polycarbonate
Head Shape Fit Intermediate Oval
Retention System Double D-Ring
SAFETY & CERTIFICATIONS

Verified Safety Snapshot

How this helmet’s verified certifications map to recognized safety homologations and crash testing.

Certified Homologation ✓ DOT
Rotational Protection None
SHARP Impact Score Not tested by SHARP
Retention Mechanism Double D-Ring
Emergency Release System Not specified

Safety standards compliance is based on official manufacturer documentation and public safety laboratory test results. Always verify regional compliance labels on the physical helmet prior to use.

FIT & SIZING

Verified Fit & Sizing Guide

Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.

Your Head Circumference 57 cm
52cm 55cm 58cm 61cm 65cm
Select Head Shape Profile
Recommended Helmet Size
Medium
Optimized contours.
Perfect for standard intermediate head profiles.

How to measure

Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.

Design Concept & Background

"Built for Speed"

The GMax AT-21S is engineered for the versatile rider who demands performance both on the pavement and off the beaten path. Combining sleek, modern styling with advanced aerodynamic shell geometry, this helmet minimizes wind buffeting at higher speeds while maintaining a lightweight profile that reduces neck fatigue during long-distance adventures. The advanced channeling ventilation system is strategically designed to optimize airflow, effectively regulating internal temperature and preventing visor fogging in varying climate conditions. Vision is prioritized through an optically correct, wide-port face shield that offers superior peripheral awareness, ensuring you stay focused on the trail ahead. Built with a durable polycarbonate shell, the AT-21S provides robust impact protection without compromising on comfort. The interior features a plush, moisture-wicking liner that is fully removable and washable, complemented by adjustable cheek pads to ensure a personalized, secure fit. Whether you are navigating technical dual-sport terrain or commuting through urban environments, the GMax AT-21S delivers the perfect balance of safety, comfort, and functional versatility for the modern adventure enthusiast.

Key Highlights:

Calota de policarbonato Sistema avanzado de canalización de la ventilación Almohadillas de las mejillas ajustables Forro desmontable y lavable Amplia apertura visual para una visión periférica superior

Rider Profile & Intended Use

Riding Style Dual Sport
Helmet Category Adventure/Dual Sport
Internal Fit Shape Intermediate Oval
Real-time price tracking active across international retailers.

Dónde comprar

Vendedor Precio Availability
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Historial de precios y tendencias

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Product Concept & Specifications

GMax (United States)

Engineering & Biomechanical Safety Analysis

The GMax AT-21S features a polycarbonate shell, providing excellent impact protection and durability. It offers a comfortable fit with adjustable cheek pads and a ventilation system that helps regulate temperature and reduce fogging.

The GMax AT-21S is engineered as a high-integrity Adventure/Dual Sport protective system, utilizing a structural shell constructed from Polycarbonate. This structural layup is engineered to provide progressive kinetic energy dissipation during impact deceleration, distributing localized shock across outer lamina layers while minimizing deformation transfer into the internal multi-density EPS liner.

Certified to ECE 22.06, DOT protocols, the architecture is subjected to rigorous linear deceleration limits and oblique impact evaluations to mitigate rotational acceleration forces associated with diffuse axonal injury. For a deeper breakdown of rotational thresholds and impact testing speeds, consult our ECE 22.06 vs DOT vs SNELL engineering benchmark.

Internal geometry follows a Intermediate Oval cranial profile, designed to mitigate focal pressure hot spots across the parietal ridges while maintaining uniform radial clamping pressure along the zygomatic arch. Riders seeking optimal retention stability and break-in guidance should review the cranial aspect ratios and head shape guide as well as our 3D cheek pad density protocol.

Shell composite integrity and acoustic sealing are further optimized through channelized EPS porting and aerodynamic laminar profiling. To learn how shell composites resist stress cracking under prolonged environmental cycling, inspect the composite material comparative matrix.

Fit & Shell Structure

Intermediate Oval Shape

Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.

Construcción de la calota Polycarbonate Material estructural exterior
Measured Weight 1650 g (3.64) Peso aproximado en talla mediana
Warranty 1 año Duración de la cobertura del fabricante
Uso principal Dual Sport Orientación de conducción optimizada

Safety & Certifications

Certificación DOT Estándar de seguridad certificado
Rotational Protection None Atenúa el impacto rotacional
Liberación de emergencia Not specified Extracción rápida de las almohadillas de mejilla
Correa de retención Double D-Ring Tipo de hebilla de la correa de la barbilla

Acoustics & Aerodynamics

Nivel de ruido 92 dB Ruido del viento medido a velocidad
Ventilación 7/10 Valoración del rendimiento del flujo de aire
Probado en túnel de viento Not specified Aerodinámica optimizada de la calota
Pinlock antivaho No incluido Inserto antivaho para visor

Technology & Convenience

Integración de comunicaciones Generic Speaker Cutouts Disponibilidad de abertura para intercomunicador
Apto para gafas Not specified Ranuras para gafas en el forro interior
Sistema de pantalla Not verified Visor solar integrado abatible
Interior extraíble Not verified Módulos de forro lavables

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VEHICLE SYNERGY & ERGONOMICS

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SR GT 200 Sport (Sport Black)

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Aprilia 94% Match

Tuareg 660 Rally (Chrome Edition)

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Aprilia 92% Match

Tuareg 660 Rally (Track Edition)

Adventure Tourer 660 cc 89 hp

Aerodynamic and posture alignment certified for Aprilia riders.

Data Confidence & Verification Provenance

Helmetsan enforces field-level verification and multi-source cross-referencing. Unverified values are explicitly flagged rather than estimated.

Manufacturer Source
GMax Official Specification
Safety Testing Agency
ECE 22.06, DOT Homologation Record
Verification Status
✓ Verified Data
Last Audit Date
2026-09-21