Just1 J-GPR Racing Helmet – Golden Road Carbon/Gold
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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 in Golden Road carbon/gold is engineered around one principle: a helmet you forget you are wearing. Four shell sizes paired with four EPP/EPS liner sizes create a genuinely tailored fit that stays comfortable across long stints on road or track, while the 3K carbon fibre shell keeps weight in check without compromising a gram of protection.
Key Features
- S.D.C. System (Sequential Density Construction) absorbs both linear and rotational impact forces through materials of varying densities — optimised protection for real-world crash mechanics
- Four shell sizes and four EPP/EPS liner sizes deliver a precise, individual fit rarely found in production helmets
- 3K carbon fibre shell: exceptional rigidity-to-weight ratio in a gloss Golden Road finish
- J.1.E.R. emergency cheek-pad removal system allows first responders to remove the helmet safely without exacerbating injury
- PROTX2 antimicrobial technology throughout the liner keeps the interior fresh across full-day rides
- Comprehensive 5-inlet / 6-outlet ventilation circuit with an integrated, vented rear spoiler for sustained airflow
- EPS-lined chin guard, removable and washable liner, hydration-pack (Camel-Bag) ready
Comfort and Fit
Where many racing helmets force a compromise between performance and wearability, the J-GPR resolves that tension through its multi-shell architecture. By manufacturing four distinct shell sizes rather than relying on thick padding to fill a single shell, Just1 ensures the structural geometry wraps closely around your head — reducing hotspots, pressure points, and the fatigue that accumulates over a full day in the saddle or a full afternoon on track. The removable liner uses PROTX2 antimicrobial treatment and pulls out for machine washing, so freshness is easy to maintain across a season.
To find your size, wrap a measuring tape approximately 1 cm above your ears around the widest point of your head and match to the table below:
- XS — 53-54 cm
- S — 55-56 cm
- M — 57-58 cm
- L — 59-60 cm
- XL — 61-62 cm
- XXL — 63 cm
Protection and Construction
UNECE 22-06 homologation confirms the J-GPR meets current European road and race safety standards. The S.D.C. system layers EPP and EPS foams of different densities so that energy from an impact is absorbed progressively rather than passed directly to the skull. The EPS-lined chin guard extends that protection to the lower face — an area that absorbs a significant proportion of real-world impacts. The double-D-ring retention system is the benchmark for helmet retention: simple, reliable, and preferred at circuit level worldwide.
Ventilation
Five intake vents channel air across the rider's head, while six exhaust outlets pull warm air out through the integrated rear spoiler. The circuit is designed to work at road speeds as well as on track, giving you genuine cooling rather than the token slot-cutting found on lesser lids.
Fitment and Compatibility
The Just1 J-GPR is a universal full-face helmet suitable for road riding and track days. It is compatible with the included Pinlock insert and ships with both a clear and a dark visor. The shell is Camel-Bag (hydration pack) prepared. Part number: 6030160801004.
Specifications
| Specification | Detail |
|---|---|
| Brand | Just1 |
| Model | J-GPR |
| Colour / Finish | Golden Road, gloss |
| Shell material | 3K carbon fibre |
| Certification | UNECE 22-06 |
| Weight | 1,550 g +/- 50 g (size M) |
| Retention system | Double-D ring |
| Ventilation | 5 inlets / 6 outlets |
| Part number | 6030160801004 |
| Brand | Just1 |
|---|---|
| Model | J-GPR |
| Colour / Finish | Golden Road, gloss |
| Shell material | 3K carbon fibre |
| Certification | UNECE 22-06 |
| Weight | 1,550 g +/- 50 g (size M) |
| Retention system | Double-D ring |
| Ventilation | 5 inlets / 6 outlets |
| Part number | 6030160801004 |
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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 Racing Helmet – Golden Road Carbon/Gold
Tech specs
- Brand
- Just1
- Model
- J-GPR
- Colour / Finish
- Golden Road, gloss
- Shell material
- 3K carbon fibre
- Certification
- UNECE 22-06
- Weight
- 1,550 g +/- 50 g (size M)
- Retention system
- Double-D ring
- Ventilation
- 5 inlets / 6 outlets
- Part number
- 6030160801004
- 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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