Just1 J-GPR Racing Helmet – Cyber Red/Carbon
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Size chart JUST1 J-STR/PGR/PGRF
| Size | Head circumference (cm) | Head circumference (inch) |
|---|---|---|
| XS | 53–54 cm | 20.9–21.3 in |
| S | 55–56 cm | 21.7–22.0 in |
| M | 57–58 cm | 22.4–22.8 in |
| L | 59–60 cm | 23.2–23.6 in |
| XL | 61–62 cm | 24.0–24.4 in |
| XXL | 63–64 cm | 24.8–25.2 in |
How to measure your helmet size correctly: To find the right helmet size, measure your head circumference with a flexible tape measure.
It is important that the tape measure runs around the widest part of the head – only then will you get a correct result.
Place the tape measure at the front, about 1–2 cm above the eyebrows, and run it along the sides above the ears.
At the back, the tape must run over the largest part of the back of the head (not too low on the neck). The tape may run slightly at an angle – what matters is that it sits all the way around the largest points of the head.
Make sure the tape measure sits snugly but does not dig in. Measure 2–3 times for the most accurate result. You can then compare the measured value in centimetres (cm) with our size chart.
Tips for an accurate result
- Keep hair flat (e.g. do not measure over a voluminous hairstyle)
- Keep the tape horizontal, i.e. along the largest circumference
- Do not measure too loosely
- For values between two sizes:
→ usually choose the larger size (depending on helmet model / fit)
Important note on fit
The right helmet should fit firmly without causing uncomfortable pressure points.
A new helmet may feel a little tighter at first, as the inner lining adapts slightly over time.
- Worldwide shipping
- Genuine parts & verified quality
- Personal email support
- 14-day returns — in stock ships within 24h
Shipping & Returns
We ship with DHL and FedEx — express on request. If an item is in stock, express delivery can often go out within 1 business day. Standard delivery takes about 2–5 business days domestically and usually around a week worldwide. Please check the available shipping options and delivery times in your cart, as we offer several carriers depending on the country.
Returns must be registered in advance by email and are possible in line with our cancellation policy (14-day return request + 14-day return window after approval). Please note: unregistered returns are not accepted. You'll find all details on conditions, exceptions and refunds in our cancellation policy.
Payment & Security
Payment methods
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The Just1 J-GPR in Cyber Red/Carbon brings genuine race-derived protection to everyday road use and track days alike, without asking you to compromise on comfort or value. Its 3K carbon fibre shell and S.D.C. (Sequential Density Construction) inner architecture make this one of the most intelligently engineered full-face helmets in its class.
Key Features
- S.D.C. System uses multi-density materials to absorb both linear and rotational impact energy, reducing the forces transmitted to your head in a real-world crash
- 3K carbon fibre shell offered in four shell sizes and four EPP/EPS liner sizes for a genuinely precise, individual fit
- J.1.E.R. emergency cheek-pad removal system allows first responders to remove pads quickly and safely without disturbing the helmet
- PROTX2 antimicrobial technology built into the liner fabric keeps the interior fresher for longer between washes
- Fully removable and washable interior with a new liner-retention net for a secure, rattle-free fit
- Camelback hydration system compatible — ideal for long road rides and endurance track sessions
- Generous ventilation layout with 5 intake and 6 exhaust ports, plus an integrated, vented spine protector
Built for the Road, Ready for the Track
Just1 designed the J-GPR as their most advanced helmet, and the Cyber Red/Carbon colourway makes that ambition visible. The high-gloss finish showcases the carbon weave beneath, while the aerodynamic shell profile cuts cleanly through the air at motorway speeds. The EPS-lined chin bar adds a meaningful layer of protection often missing from budget alternatives, and the double-D ring retention system ensures the helmet stays exactly where it should in an impact.
Everyday Comfort and Usability
The removable, washable interior is treated with PROTX2 antimicrobial technology, so the liner stays hygienic even after consecutive riding days. Measuring your head is straightforward: place a tape measure approximately 1 cm above the ears around the widest part of your head, then match the circumference to the size guide below. The included Pinlock-ready anti-fog visor and dark tinted visor mean you are equipped for changing light conditions straight out of the box.
Size Guide
- XS: 53–54 cm
- S: 55–56 cm
- M: 57–58 cm
- L: 59–60 cm
- XL: 61–62 cm
- XXL: 63 cm
Fitment & Compatibility
The Just1 J-GPR is a universal full-face helmet approved for road use across all motorcycle types. It is not model-specific and fits any rider whose head circumference falls within the size range above. UNECE 22-06 homologation confirms it meets current European road-legal standards.
Specifications
- Part number: 6030160171010
- Shell material: 3K carbon fibre
- Certification: UNECE 22-06
- Weight: 1,550 g ± 50 g (size M)
- Colour: Cyber Red/Carbon
- Finish: gloss
- Retention system: double-D ring
- Anti-fog visor: yes (included)
- Removable interior: yes
- Shell sizes: 4
- Liner sizes: 4 EPP/EPS
- Ventilation: 5 intake / 6 exhaust ports
- Camelback compatible: yes
| Part Number | 6030160171010 |
|---|---|
| Shell Material | 3K carbon fibre |
| Certification | UNECE 22-06 |
| Weight | 1,550 g ± 50 g (size M) |
| Colour | Cyber Red/Carbon |
| Finish | Gloss |
| Retention System | Double-D ring |
| Removable & Washable Interior | Yes |
| Ventilation | 5 intake / 6 exhaust ports |
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1x Just1 J-GPR helmet
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1x clear visor
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1x Pinlock insert
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1x dark tinted visor
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1x nose cover
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1x premium helmet bag
Fitment data coming soon.
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// Just1
Just1 J-GPR Racing Helmet – Cyber Red/Carbon
Tech specs
- Part Number
- 6030160171010
- Shell Material
- 3K carbon fibre
- Certification
- UNECE 22-06
- Weight
- 1,550 g ± 50 g (size M)
- Colour
- Cyber Red/Carbon
- Finish
- Gloss
- Retention System
- Double-D ring
- Removable & Washable Interior
- Yes
- Ventilation
- 5 intake / 6 exhaust ports
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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