HJC RPHA31 Dereen MC21

HJC RPHA 31 - Premium P.I.M.(TM) open face helmet, visor deflector, and anti-opening lock

The HJC RPHA 31 is the top-of-the-line open-face helmet in the RPHA series, designed to reduce noise and drag thanks to a dedicated visor deflector and a locking system that secures the visor against accidental opening. With a P.I.M.(TM) shell, DMS sun visor, and HJC SMART compatibility, it's designed for discerning urban riders.

HJC RPHA 31 Open Face Helmet: The Top-of-the-Line Model Designed for Quiet Riding

A high-performance open face helmet must minimize wind noise without sacrificing lightness. The HJC RPHA 31 was designed with this in mind, featuring a P.I.M.(TM)--Premium Integrated Matrix--shell, a high-performance material composed of epoxy-infused fiber fabrics, available in four shell sizes. Its aerodynamic design improves airflow, while a bypass air channel through the ventilation system reduces drag and wind noise.

In front of you, the Pinlock-ready HJ-39 visor--with a 120XLT lens included in the box--blocks 99% of UV rays and features anti-scratch and anti-fog coatings. The visor mounting kit provides smooth movement and improved sealing, while a dedicated visor deflector reduces noise levels and blocks incoming wind. A locking system rounds out the package, further reducing noise and air drag while securing the visor to prevent accidental opening.

The extended shell and chin EPS provide a full-face fit, offering a more enveloping hold than a traditional open-face helmet. The helmet also features a 3-stage adjustable DMS sun visor, full front-to-back ventilation with 2 air intakes and 4 exhaust vents, and remains compatible with the 2nd-generation HJC SMART 11B, 21B, and 50B Bluetooth systems, sold separately.

Key Features of the HJC RPHA 31

• P.I.M.(TM) - Premium Integrated Matrix shell: four shell sizes, aerodynamic design.
• Bypass Air Channel: reduces air drag and wind noise.
• HJ-39 Visor: Pinlock-ready (120XLT lens included), with anti-scratch and anti-fog coating.
• Dedicated visor deflector: reduces noise and blocks incoming wind.
• Visor lock: prevents accidental opening, reduces noise and drag.
• Extended shell and chin EPS: full facial fit.
• 3-position adjustable DMS sun visor.
• Full front-to-back ventilation: 2 air intakes and 4 air vents.
• Compatible with HJC 11B, 21B, and 50B 2nd-generation Bluetooth systems (sold separately).
• 5-year warranty.

Technical Specifications

• Helmet type: premium open face helmet
• Shell material: P.I.M.(TM) - Premium Integrated Matrix, fiber-reinforced materials infused with epoxy resin
• Number of shell sizes: 4
• Main visor: HJ-39, scratch-resistant and anti-fog coated, 99% UV protection
• Pinlock: 120XLT lens included in the box
• Visor mounting kit: smooth movement, improved waterproofing
• Visor deflector: noise reduction, blocks wind from entering
• Visor lock: prevents accidental opening
• Sunshield: DMS - Dynamic Multi-Step Sunshield, adjustable to 3 positions
• Ventilation: full front-to-back ventilation, 2 air intakes and 4 air vents
• Fit: Extended shell and chin EPS for full facial support
• Interior: Antibacterial fabric that wicks away moisture and dries quickly
• Foam: Removable, washable, and interchangeable inner liner and cheekpads across all sizes
• Closure: one-touch buckle
• Goggle groove
• Intercom: Compatible with SMART HJC 11B, 21B, and 50B 2nd-generation Bluetooth systems, sold separately
• Included in the box: Pinlock 120XLT lens
• Sizes: up to 2XL
• Weight: approximately 1,350 to 1,450 g depending on size and measurement sources; weight may vary depending on helmet size--check the official technical specifications
• Certification: ECE 22.06
• Warranty: 5 years

Why choose the HJC RPHA 31?

The RPHA 31 stands out for its specific focus on noise reduction and aerodynamics, which is rare in an open face helmet: a bypass air channel, a dedicated visor deflector, and an anti-opening locking system all work together to reduce the noise typically associated with this type of helmet.

Its extended shell and chin EPS provide a more secure fit than a classic open face helmet, offering a level of support closer to that of a full-face helmet while retaining the advantages of an open face design. The 5-year warranty underscores the helmet's premium positioning within the RPHA collection.

Comfort and Ventilation

The RPHA 31's full front-to-back ventilation system, featuring 2 air inlets and 4 air outlets, ensures effective airflow for everyday use. The antibacterial, removable, and washable liner complements this design, with interchangeable cheekpads available in all sizes to fine-tune the fit.

Visor Deflector and Locking Mechanism

The dedicated visor deflector blocks incoming wind while reducing perceived noise levels--a significant advantage on the highway or at high speeds. The locking system reinforces this design by securing the visor against accidental opening, while also helping to reduce noise and air drag.

HJ-39 Visor and DMS Sun Visor

The HJ-39 visor features a scratch-resistant and anti-fog coating, with Pinlock compatibility and a lens included in the box. The DMS sun visor, adjustable to 3 positions, allows for precise adaptation to changes in light conditions while riding.

Care Instructions

Clean the HJC RPHA 31 visor with lukewarm water and a soft microfiber cloth, avoiding any harsh household cleaners that could damage the anti-scratch and anti-fog coatings.

Since the inner liner and cheekpads are removable, wash them regularly by hand with mild soap, then let them air dry away from direct heat sources.

Periodically check that the deflector and the visor locking system are working properly to ensure your helmet remains reliable and quiet over time.

Frequently Asked Questions About the HJC RPHA 31

Is the HJC RPHA 31 ECE 22.06-certified?

Yes. The HJC RPHA 31 meets the European ECE 22.06 standard, which requires, among other things, testing for impact absorption and the strength of the helmet's various components.

How does the HJC RPHA 31 reduce wind noise?

The helmet combines several features designed for this purpose: a bypass air channel through the ventilation system, a visor deflector that blocks incoming wind, and a visor locking system that further reduces noise and drag.

Does the HJC RPHA 31 come with a Pinlock?

Yes. The Pinlock 120XLT lens is included in the box, ready to be installed on the pre-equipped HJ-39 visor.

Can an intercom be installed on the HJC RPHA 31?

Yes. The helmet is compatible with the HJC 11B, 21B, and 50B 2nd-generation Bluetooth SMART systems, sold separately.