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The HJC RPHA 1N Helmet is a race-focused full-face helmet developed for high-speed riding and competition. Its P.I.M. Plus shell uses carbon and carbon-glass hybrid reinforcement materials for a lightweight, high-performance construction. The aerodynamic shell and advanced ventilation system are designed to promote airflow, while the race-focused interior and shield system provide a secure, performance-oriented fit.
- P.I.M. Plus Premium Integrated Matrix Plus shell construction
- Carbon and carbon-glass hybrid reinforcement materials
- Aerodynamic shell design
- Five intake and four exhaust vents
- ACS Advanced Channeling Ventilation System
- Pinlock-ready HJ-35 anti-scratch face shield
- Easy Attachment System for quick, tool-less shield replacement
- SilverCool moisture-wicking interior fabric
- Removable and washable crown and cheek pads
- Speaker pockets for Bluetooth communication systems
- Includes breath deflector and chin curtain
- Includes clear extended aero spoiler and tear-offs
- FIM, ECE, and DOT approved
- Approximate weight: 3.33 lb. / 1508 g based on a Medium solid-color helmet
HJC RPHA 1N Helmet Size Chart
| Size | Head Circumference | Hat Size |
|---|---|---|
| XS | 20 7/8-21 1/4 in. | 6 5/8-6 3/4 |
| S | 21 5/8-22 in. | 6 7/8-7 |
| M | 22 1/2-22 7/8 in. | 7 1/8-7 1/4 |
| L | 23 1/4-23 5/8 in. | 7 3/8-7 1/2 |
| XL | 24-24 3/8 in. | 7 5/8-7 3/4 |
| 2XL | 24 3/4-25 1/8 in. | 7 7/8-8 |
How to Measure: Wrap a flexible measuring tape around the fullest part of your head, approximately 1 inch above your eyebrows and ears. Keep the tape comfortably snug and level, then compare the measurement with the size chart to determine the appropriate helmet size.
Helmet Size Convention Chart
The size chart is for reference. Always try the helmet on and follow the instructions for a proper fit.
| Size | CM | Hat Size | Inches |
|---|---|---|---|
| 3XS | 50–51 | 6 1/4 – 6 3/8 | 19 3/4 – 20 1/8 |
| 2XS | 52–53 | 6 1/2 – 6 5/8 | 20 1/2 – 20 7/8 |
| XS | 54–55 | 6 3/4 – 6 7/8 | 21 1/4 – 21 5/8 |
| S | 55–56 | 6 7/8 – 7 | 21 5/8 – 22 |
| M | 57–58 | 7 1/8 – 7 1/4 | 22 1/4 – 22 7/8 |
| L | 58–59 | 7 1/4 – 7 3/8 | 23 1/4 – 23 5/8 |
| XL | 60–61 | 7 1/2 – 7 5/8 | 23 5/8 – 24 |
| 2XL | 62–63 | 7 3/4 – 7 7/8 | 24 3/8 – 24 3/4 |
| 3XL | 64–65 | 8 – 8 1/8 | 25 1/8 – 25 1/2 |
| 4XL | 66–67 | 8 1/4 – 8 3/8 | 26 – 26 3/8 |
| 5XL | 68–69 | 8 1/2 – 8 5/8 | 26 3/4 – 27 1/8 |
Fast Shipping
Cutoff times apply to in-stock items. Delays may occur during peak periods.