HJC RPHA 1N 2 CARBON
The RPHA 1N is HJC's MotoGP helmet, street-legal: developed with their factory grand prix riders and homologated to FIM's racing standard on top of DOT and ECE 22.06. The P.I.M.... Read More
The RPHA 1N is HJC's MotoGP helmet, street-legal: developed with their factory grand prix riders and homologated to FIM's racing standard on top of DOT and ECE 22.06. The P.I.M. Plus shell blends carbon and carbon-glass hybrid fibers across six layers.
The flat HJ-35 race shield is tear-off ready, and the box includes a Pinlock lens, tear-off posts, and a clear extended aero spoiler. Emergency cheek pads and a Double-D ring closure complete the race specification.
Features
- DOT FMVSS 218, ECE 22.06, and FIM FRHPhe-01 homologated
- P.I.M. Plus 6-ply carbon / carbon-glass hybrid shell
- HJ-35 flat race shield, tear-off ready
- Pinlock lens, tear-offs, and clear extended aero spoiler included
- Emergency cheek-pad release
- Double-D ring chinstrap
- 5-intake / 4-exhaust ACS ventilation
Specs
- Certification: DOT FMVSS 218, ECE 22.06, FIM FRHPhe-01
- Shell: P.I.M. Plus carbon hybrid
- Shield: HJ-35 race flat, tear-off ready, Pinlock included
- Closure: Double-D ring
How to measure
Wrap a cloth tape measure horizontally around the fullest part of your head, about 1 inch (2.5 cm) above the eyebrows. Repeat a few times and use the largest measurement. The chart is a starting point — always try the helmet on for final fit.
HJC size chart
| Size | Head circumference (cm) | Head circumference (inches) | Hat size |
|---|---|---|---|
| 3XS | 50-51 | 19 3/4 - 20 1/8 | 6 1/4 - 6 3/8 |
| 2XS | 52-53 | 20 1/2 - 20 7/8 | 6 1/2 - 6 5/8 |
| XS | 54-55 | 21 1/4 - 21 5/8 | 6 3/4 - 6 7/8 |
| S | 55-56 | 21 5/8 - 22 | 6 7/8 - 7 |
| M | 57-58 | 22 3/8 - 22 7/8 | 7 1/8 - 7 1/4 |
| L | 58-59 | 22 7/8 - 23 1/4 | 7 1/4 - 7 3/8 |
| XL | 60-61 | 23 5/8 - 24 | 7 1/2 - 7 5/8 |
| 2XL | 62-63 | 24 3/8 - 24 3/4 | 7 3/4 - 7 7/8 |
| 3XL | 64-65 | 25 1/8 - 25 1/2 | 8 - 8 1/8 |
| 4XL | 66-67 | 26 - 26 3/8 | 8 1/4 - 8 3/8 |
| 5XL | 68-69 | 26 3/4 - 27 1/8 | 8 1/2 - 8 5/8 |
Youth sizes
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YS | 48-49 | 18 7/8 - 19 1/4 |
| YM | 50-51 | 19 5/8 - 20 1/8 |
| YL | 52-53 | 20 1/2 - 20 7/8 |
One official HJC chart covers all models (full-face, modular, open-face, half); size availability varies per model. cm values are canonical (verified on both official US and EU HJC sites); inch values follow the mathematically consistent EU print where the US page conflicts with its own cm column (M and L rows). Note: many retailers still publish HJC's LEGACY chart (XS 53-54 … 3XL 65-66), which disagrees with the current official chart — do not mix them. Youth chart is the official Y10 chart (EU site).
Manufacturer sizing data · verified July 8, 2026