Just1 J-GPRF Racing Helmet Solid Matte Black 6130320201000
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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.
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The Just1 J-GPRF in solid matte black is a full-face racing helmet that wears its intent on its surface — a clean, understated finish that lets engineering speak louder than graphics. Developed specifically for both road riding and competitive motorsport, the J-GPRF represents Just1's most advanced helmet to date, built around the proprietary S.D.C. (Sequential Density Construction) system for superior impact management.
Key Features
- S.D.C. (Sequential Density Construction) — multi-density materials absorb both linear and rotational impact forces, directing energy away from the rider's head
- Multicomposit Fiber shell available across 4 shell sizes, paired with 4 EPP/EPS liner sizes, for a precise and personalised fit at every head circumference
- J.1.E.R. emergency cheek-pad removal system for first-responder access without compromising the rider
- PROTX2 antimicrobial technology throughout the interior lining, keeping the helmet fresh on long riding days
- 11-port ventilation system with 5 intakes and 6 exhaust vents, plus an integrated, vented chin guard with EPS lining
- Pinlock-ready anti-fog visor included as standard, alongside a tinted visor for variable light conditions
- Hydration system compatible — internal camel bag preparation built in
Craftsmanship and Finish
The matte black finish on the J-GPRF is not an afterthought — it is a deliberate design statement rooted in Just1's racing heritage. Where gloss finishes demand attention, the solid matte surface projects quiet confidence and translates directly to the track aesthetic that serious riders expect. The Multicomposit Fiber construction keeps the shell light without sacrificing structural integrity, and the four discrete shell sizes ensure the geometry remains correct regardless of the size you choose.
Inside, the fully removable and washable liner uses a retention net system to maintain its position under hard riding, while the double-D ring closure delivers the secure, competition-proven fastening that racing helmets require. The liner's PROTX2 antimicrobial treatment actively resists bacteria and odour over time — a meaningful advantage for riders who log serious mileage.
Road and Track Performance
The J-GPRF is certified to UNECE 22-06, the current European standard for motorcycle helmets, making it legal for road use across Europe while meeting the demands of track-day and racing environments. The ventilation architecture — five dedicated intake ports channelling air through the shell, six exhaust vents drawing it out — is designed to maintain airflow at pace, reducing fogging and heat build-up during sustained high-speed riding. The integrated, EPS-lined chin guard adds a further layer of protection at an area frequently compromised in lesser helmets.
Fitment and Sizing
To determine your correct size, wrap a soft tape measure approximately 1 cm above the ear, around the widest point of your head. Match the resulting measurement to the size guide below.
- XS — 53-54 cm
- S — 55-56 cm
- M — 57-58 cm
- L — 59-60 cm
- XL — 61-62 cm
- XXL — 63 cm
Specifications
- Part number: 6130320201000
- Shell material: Multicomposit Fiber
- Certification: UNECE 22-06
- Weight: 1,600 g +/- 50 g (size M)
- Colour: solid black, matte finish
- Closure: double-D ring
- Anti-fog visor: yes (included)
- Removable liner: yes
- Hydration compatible: yes (camel bag preparation)
- Ventilation: 5 intake / 6 exhaust ports
| Brand | Just1 |
|---|---|
| Model | J-GPRF |
| Part Number | 6130320201000 |
| Shell Material | Multicomposit Fiber |
| Certification | UNECE 22-06 |
| Weight | 1,600 g +/- 50 g (size M) |
| Colour / Finish | Solid black, matte |
| Closure System | Double-D ring |
| Ventilation | 5 intake ports, 6 exhaust vents |
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1x Just1 J-GPRF helmet
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1x clear visor
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1x Pinlock insert
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1x 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-GPRF Racing Helmet Solid Matte Black 6130320201000
Tech specs
- Brand
- Just1
- Model
- J-GPRF
- Part Number
- 6130320201000
- Shell Material
- Multicomposit Fiber
- Certification
- UNECE 22-06
- Weight
- 1,600 g +/- 50 g (size M)
- Colour / Finish
- Solid black, matte
- Closure System
- Double-D ring
- Ventilation
- 5 intake ports, 6 exhaust vents
- 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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