RPHA31 Dereen MC21

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

The HJC RPHA 31 is the premium 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 its P.I.M.™ shell, DMS sun visor and SMART HJC compatibility, it is designed for discerning urban riders.

HJC RPHA 31 open-face helmet: the premium model designed for silence

A high-performance open-face helmet must limit wind noise without compromising lightness. The HJC RPHA 31 was designed with this in mind, featuring a P.I.M.™ – Premium Integrated Matrix shell, a high-performance material made of fibrous fabrics infused with epoxy resin, available in four shell sizes. Its aerodynamic design improves airflow penetration, while an air bypass channel through the ventilation reduces drag and wind noise.

The HJ-39 Pinlock-ready visor – with a 120XLT lens included in the box – filters 99% of UV rays and features a scratch-resistant, anti-fog coating. 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 completes the setup, 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 standard open-face helmet. The helmet also features a 3-position adjustable DMS sun visor, full front-to-back ventilation with 2 air inlets and 4 air outlets, and is compatible with the SMART HJC 11B, 21B and 50B 2nd Generation Bluetooth systems, sold separately.

Key features of the HJC RPHA 31

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

Technical specifications

• Helmet type: premium open-face
• Shell material: P.I.M.™ – Premium Integrated Matrix, fibrous fabrics infused with epoxy resin
• Number of shell sizes: 4
• Main visor: HJ-39, scratch-resistant and anti-fog coating, 99% UV protection
• Pinlock: 120XLT lens included in the box
• Visor mounting kit: smooth movement, improved sealing
• Visor deflector: noise reduction, blocks incoming wind
• Visor lock: secures against accidental opening
• Sun visor: DMS – Dynamic Multi-Step Sunshield, adjustable to 3 positions
• Ventilation: full front-to-back, 2 air inlets and 4 air outlets
• Fit: extended shell and chin EPS for full-face support
• Interior: antibacterial fabric that promotes moisture release and quick drying
• Pads: removable, washable cheek pads that are interchangeable across all sizes
• Closure: one-touch buckle
• Glasses channel
• Intercom: compatible with SMART HJC 11B, 21B and 50B 2nd Generation Bluetooth, 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, to be checked on the official technical sheet
• Approval: ECE 22.06
• Warranty: 5 years

Why choose the HJC RPHA 31?

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

Its extended shell and chin EPS provide a more comprehensive fit than a standard open-face helmet, approaching the support of a full-face helmet while retaining the benefits of an open-face. The 5-year warranty confirms the helmet's premium positioning within the RPHA collection.

Comfort and ventilation

The RPHA 31's full front-to-back ventilation, with 2 air inlets and 4 air outlets, ensures efficient airflow for everyday use. The removable and washable antibacterial interior completes this approach, with cheek pads that are interchangeable across all sizes to refine the fit.

Visor deflector and lock

The dedicated visor deflector blocks incoming wind while reducing perceived noise levels, a valuable feature on motorways or at sustained speeds. The locking system reinforces this approach 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, anti-fog coating, Pinlock readiness and a lens included in the box. The 3-position adjustable DMS sun visor allows you to adapt precisely to changes in brightness while riding.

Care instructions

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

As the top cover and cheek pads are removable, wash them regularly by hand with mild soap, then leave them to air dry away from any direct heat source.

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

Frequently asked questions about the HJC RPHA 31

Is the HJC RPHA 31 ECE 22.06 approved?

Yes. The HJC RPHA 31 meets the ECE 22.06 European standard, which includes tests on 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: an air bypass channel through the ventilation, a visor deflector that blocks incoming wind, and a visor locking system that further reduces noise and drag.

Is a Pinlock supplied with the HJC RPHA 31?

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

Can an intercom be installed on the HJC RPHA 31?

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