HJC · C91
C91
Quick Facts at a Glance
Verified Safety Snapshot
How this helmet’s verified certifications map to recognized safety homologations and crash testing.
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.
Verified Fit & Sizing Guide
Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.
Designed for oval head shapes; offers a wide field of vision due to open-face design.
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
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Tailored for classic roadsters and urban cruising, the HJC C91 pairs retro roadster charm with modern multi-density cranial protection. Featuring a High-Yield Impact-Resistant Polycarbonate / Lexan architecture at a featherweight 1298g, it combines progressive kinetic energy dissipation across DOT, ECE 22.05 certifications with an acoustically tuned ~97 dB aero profile. The interior features a plush, moisture-wicking crown liner shaped for Intermediate Oval head shapes, secured by track-proven Double D-Ring retention for effortless warm-weather riding.
Rider Profile & Intended Use
Where to buy
| Retailer | Price | Availability | |
|---|---|---|---|
| Amazon (US) | Check live price | View on site | Check Price → |
Price History & Trends
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Product Concept & Specifications
HJC (South Korea)Engineering & Technical Analysis
Features Premium Integrated Matrix (P.I.M. Plus) carbon and carbon-glass hybrid fabric shell structure paired with RapidFire II visor replacement system with 2D flat race shield and dual locking mechanism. The interior utilizes ACS Advanced Channeling Ventilation System with Multicool anti-bacterial temperature-regulating interior with pre-shaped speaker cutouts for seamless Bluetooth comms integration.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Regional Legality & Compliance
Meets FMVSS 218 standards.
Compliant with ECE 22.05 safety regulations.
Regional Legality Guidance
Interactive Size & Fit Finder
Designed for oval head shapes; offers a wide field of vision due to open-face design.
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.
Part numbers
| Product style | MFR. product # | SKU | Availability |
|---|---|---|---|
| Black / | — |
HSN-VAR-HJC-C91-BLACK | instock |
| Silver / | — |
HSN-VAR-HJC-C91-SILVER | instock |
Available Colors & Graphics
View on retailers
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Data Confidence & Verification Provenance
Helmetsan enforces field-level verification and multi-source cross-referencing. Unverified values are explicitly flagged rather than estimated.