Just1 J-STR Full-Face Helmet Solid Matte Black 6030390201000
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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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When safety certification matters as much as the ride itself, the Just1 J-STR Solid Matte Black delivers. Carrying triple homologation — ECE 22.06, DOT, and CCC — this full-face helmet is built to meet the most stringent international safety standards, wrapped in a clean, understated matte black finish that suits everything from the daily commute to an extended tour.
Key Features
- ECE 22.06, DOT, and CCC certified — meets the latest international safety requirements for road use
- ABS outer shell manufactured in two shell sizes for a precise, proportionate fit across the full size range
- EPS liner in two sizes, tuned to absorb and distribute impact energy effectively
- J.I.E.R. Emergency Cheek Pad Removal System allows first responders to remove the cheek pads rapidly in an accident scenario
- Double-D ring retention system provides a secure, rattle-free fastening every time
- Protx2 antibacterial inner lining is fully removable and washable, keeping the interior hygienic on longer trips
- Scratch-resistant visor with a wide field of view, accessory-ready for additional visors or fitments
Safety First — Built to the Highest Standards
The J-STR's safety architecture starts with an ABS outer shell that comes in two discrete sizes, meaning every head circumference from XS through XXL receives a shell proportioned specifically for it rather than a single oversized shell padded down to fit. The two-size EPS liner mirrors this approach, ensuring the energy-absorbing foam is correctly positioned relative to the rider's skull in every size. The result is a helmet that functions as its designers intended, regardless of whether you're ordering an XS or an XXL.
The J.I.E.R. Emergency Cheek Pad Removal System is a feature that riders hope never to need, but one that can make a critical difference after a collision. By allowing paramedics to remove the cheek pads swiftly and without disturbing the rider's head and neck, the system supports safe on-scene care. The double-D ring chin strap closure completes the safety package with a fastening method trusted by professionals worldwide for its reliability and resistance to accidental release.
Comfort and Ventilation
Safety-focused construction does not have to come at the cost of wearability. The J-STR's Protx2 antibacterial inner lining actively resists the build-up of odour-causing bacteria, making it a practical choice for riders who wear their helmet daily. The entire interior — cheek pads and liner — unclips and goes straight into the wash, so the helmet stays as fresh on day one hundred as it was on day one. Padding is shaped to provide a snug, pressure-free fit, and the aerodynamic shell profile reduces buffeting fatigue on longer rides.
Visor and Equipment
The scratch-resistant visor offers a broad, undistorted field of vision, and the shell is prepared for accessory fitments should you wish to upgrade to a tinted or Pinlock-compatible visor at a later stage. A nose cover is included to help manage airflow around the chin area, and the helmet ships with a helmet bag for storage and transport without the risk of surface scratches to the matte finish.
Size Guide
To find your correct size, place a soft measuring tape approximately 1.5 cm above your eyebrows and measure the largest circumference of your head. Repeat the measurement once to confirm accuracy. The helmet should sit firmly with no pressure points. If you can rotate the helmet easily on your head, size down.
| Size | Head circumference (cm) | Inches |
|---|---|---|
| XS | 53–54 | 20.9 – 21.3 |
| S | 55–56 | 21.7 – 22.1 |
| M | 57–58 | 22.4 – 22.8 |
| L | 59–60 | 23.2 – 23.6 |
| XL | 61–62 | 24.0 – 24.4 |
| XXL | 63 | 24.8 – 25.2 |
Fitment and Compatibility
The Just1 J-STR is a universal full-face helmet suited to all adult riders. It is not vehicle-specific and is appropriate for street, touring, and everyday urban riding wherever ECE 22.06, DOT, or CCC certification is required or preferred.
Specifications
- Brand: Just1
- Model: J-STR Solid Matte Black
- Part number: 6030390201000
- Helmet type: Full-face
- Outer shell material: ABS (2 shell sizes)
- Inner liner: EPS (2 liner sizes)
- Certification: ECE 22.06, DOT, CCC
- Retention system: Double-D ring
- Emergency system: J.I.E.R. Emergency Cheek Pad Removal System
- Interior lining: Protx2 antibacterial, fully removable and washable
- Visor: Scratch-resistant, wide field of view, accessory-ready
- Colour: Solid matte black
- Available sizes: XS, S, M, L, XL, XXL
| Brand | Just1 |
|---|---|
| Model | J-STR Solid Matte Black |
| Part number | 6030390201000 |
| Helmet type | Full-face |
| Certification | ECE 22.06, DOT, CCC |
| Outer shell | ABS, 2 shell sizes |
| Inner liner | EPS, 2 liner sizes |
| Retention system | Double-D ring |
| Interior lining | Protx2 antibacterial, removable and washable |
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Just1 J-STR Solid Matte Black helmet
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Nose cover
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Helmet bag
Fitment data coming soon.
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// Just1
Just1 J-STR Full-Face Helmet Solid Matte Black 6030390201000
Tech specs
- Brand
- Just1
- Model
- J-STR Solid Matte Black
- Part number
- 6030390201000
- Helmet type
- Full-face
- Certification
- ECE 22.06, DOT, CCC
- Outer shell
- ABS, 2 shell sizes
- Inner liner
- EPS, 2 liner sizes
- Retention system
- Double-D ring
- Interior lining
- Protx2 antibacterial, removable and washable
- 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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