Just1 J-GPR Helmet Solid Carbon Matte – UNECE 22-06 Certified Race Helmet
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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
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The Just1 J-GPR is engineered where the racetrack meets the road: a full-face helmet built around the proprietary S.D.C. (Sequential Density Construction) system, which layers materials of varying densities to absorb and dissipate both linear and rotational impact forces. Certified to UNECE 22-06 — the most demanding homologation standard currently in force — this matte solid carbon shell delivers race-grade protection in a clean, uncompromising finish.
Key Features
- S.D.C. (Sequential Density Construction) multi-density impact management addresses both linear and rotational crash forces for superior head protection
- UNECE 22-06 certified — meets the latest European safety regulation for road and competition use
- Shell constructed from genuine 3K carbon fibre, available in 4 shell sizes with matched 4 EPP/EPS liner sizes for a precise, tailored fit
- J.1.E.R. emergency cheek-pad removal system allows first responders to extract the helmet safely without risking neck injury
- PROTX2 antimicrobial technology throughout the interior liner inhibits bacterial growth and odour
- 5 intake and 6 exhaust vents plus an integrated ventilated back protector keep airflow moving at pace
- Hydration-pack ready: internal routing prepared for a Camelbak-style reservoir
Construction and Comfort
Four distinct shell sizes — each paired with a dedicated EPP/EPS insert — mean the J-GPR avoids the common compromise of padding out a single shell to cover a wide head-circumference range. The result is a more uniform energy-absorbing structure around the entire skull. The removable and fully washable interior lining uses PROTX2 antimicrobial treatment to stay fresh through long track days. A redesigned liner-retention net keeps the padding precisely located even after repeated removal and refitting.
The EPS-lined chin bar adds an extra layer of protection at the front of the face, while the double-D ring retention system — the benchmark choice for serious riders and race regulations alike — delivers a secure, rattle-free fit every time. An anti-fog Pinlock visor is supplied as standard, eliminating the need for an aftermarket upgrade before you ride.
Ventilation and Aerodynamics
Eleven vents in total — five intakes and six exhausts — channel fresh air across the head and out through the integrated rear extractor. The ventilated back protector works in conjunction with this system to reduce buffeting and heat build-up at sustained road or track speeds.
Fitment and Sizing
To find your size, wrap a soft tape measure approximately 1 cm above the ears around the widest part of your head.
- XS: 53–54 cm
- S: 55–56 cm
- M: 57–58 cm
- L: 59–60 cm
- XL: 61–62 cm
- XXL: 63 cm
Specifications
| Attribute | Detail |
|---|---|
| Part Number | 6030160901000 |
| Shell Material | 3K carbon fibre |
| Certification | UNECE 22-06 |
| Weight | 1,550 g +/- 50 g (size M) |
| Colour | Solid Carbon, matte |
| Retention System | Double-D ring |
| Anti-Fog Visor | Yes (included) |
| Removable Interior | Yes, washable |
| Hydration Ready | Yes (Camelbak compatible) |
| Part Number | 6030160901000 |
|---|---|
| Shell Material | 3K carbon fibre |
| Certification | UNECE 22-06 |
| Weight | 1,550 g +/- 50 g (size M) |
| Colour | Solid Carbon, matte |
| Retention System | Double-D ring |
| Anti-Fog Visor | Yes (included) |
| Removable Interior | Yes, washable |
| Hydration Ready | Yes (Camelbak compatible) |
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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 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 Helmet Solid Carbon Matte – UNECE 22-06 Certified Race Helmet
Tech specs
- Part Number
- 6030160901000
- Shell Material
- 3K carbon fibre
- Certification
- UNECE 22-06
- Weight
- 1,550 g +/- 50 g (size M)
- Colour
- Solid Carbon, matte
- Retention System
- Double-D ring
- Anti-Fog Visor
- Yes (included)
- Removable Interior
- Yes, washable
- Hydration Ready
- Yes (Camelbak compatible)
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
Shipping & delivery
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