The HJC C91 Jyn is a modular helmet built around a lightweight shell design with advanced airflow for everyday comfort. It features an integrated sun shield and is Bluetooth ready, making it a versatile choice for riders who want convenient functionality in a clean, modern package.
Designed with rider comfort in mind, the C91 Jyn includes a moisture-wicking interior and practical details that support all-day use, from quick shield changes to eyewear-friendly fit.
Key Features
Modular helmet design
Lightweight shell construction
"ACS" Advanced Channeling Ventilation System with 1 top vent and 1 lower vent
Full front-to-back airflow to help flush heat and humidity up and out
Integrated sun visor with anti-scratch treatment
HJ-17 shield is Pinlock-ready and provides 95% UV protection
RapidFire™ shield replacement system for quick, tool-less shield changes
SuperCool interior with enhanced moisture-wicking performance
Crown and cheek pads are removable and washable
Cheek pads are interchangeable throughout all shell sizes
Micro buckle retention system
Glasses grooves to accommodate eyeglasses and sunglasses
Speaker pockets for Bluetooth communication
Includes nose guard and chin curtain
For commuting and longer rides alike, the C91 Jyn balances ventilation, convenience, and comfort-focused features—ideal for riders who want an integrated sun shield and communication-ready design without added complexity.
An owner’s manual is available for the HJC C91 Jyn and may include helpful information on setup, sizing, care, and helmet features.
A size chart is also available as a sizing reference.
Shop All American KTM for HJC helmets and riding gear, with fast nationwide service for riders across the U.S.
HJC C91 Jyn Owner’s Manual & Product Guide
View or download the official product manual for the
HJC C91 Jyn. This guide may include important information about helmet features,
fitment, care, use, safety details, replacement parts, and product-specific instructions.
⚠️ WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
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