Just1 J-STR Astro Full-Face Helmet – Red / Blue / Black Gloss
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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-STR Astro in its striking gloss Red / Blue / Black graphic is a full-face helmet designed for riders who want reliable everyday performance without sacrificing style. Built on the proven J-STR platform and certified to ECE 22.06, it earns its place as a dependable daily companion whether you're commuting across town or stretching out on a weekend road run.
Key Features
- ABS outer shell produced in 2 shell sizes for a more precise fit across the size range
- EPS inner shell in 2 densities, optimising impact management for each shell size
- ECE 22.06 and DOT certified — meets the latest international safety standards
- J.I.E.R. Emergency Cheek Pads Removal System for rapid, safe helmet removal by first responders
- Robust double-D ring fastening — the trusted standard for secure retention
- Protx2 antimicrobial lining treatment keeps the interior fresher for longer, even on back-to-back rides
- Wide Vision visor with scratch-resistant clear lens and Pinlock 70 preparation for anti-fog use in cold or wet conditions
Comfort You Can Feel on Every Ride
Day-to-day wearability is where the J-STR Astro genuinely delivers. The fully removable and washable interior can be refreshed whenever needed, while the comfortable cheek pads hold your head securely without creating pressure points over long distances. An efficient ventilation system channels airflow through the shell, keeping temperatures manageable during urban stops and open-road stints alike. The Protx2 antimicrobial treatment works quietly in the background to resist odour build-up, so the helmet stays pleasant ride after ride.
Visor and Visibility
The Wide Vision visor provides a broad, unobstructed field of view that makes filtering through traffic and reading the road ahead noticeably easier. The clear lens is scratch-resistant and prepared for an optional Pinlock 70 insert, which virtually eliminates fogging in damp or cold weather. A nose cover is included in the box to reduce interior airflow and further manage misting at lower speeds.
Design and Finish
The Astro graphic wraps the gloss shell in a confident combination of red, blue and black — a colour scheme that reads cleanly at speed and stands out in a sea of plain lids. It suits naked bike and sport bike riders looking for a head-turning finish that does not demand track-day pricing.
Fitment and Compatibility
The Just1 J-STR Astro is a universal full-face helmet suitable for adult riders across all motorcycle types. Use the size guide below to select the correct fit before ordering.
Size Guide
| 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 |
How to Measure Your Head
- Place a soft tape measure just above the eyebrows
- Measure around the widest part of the skull
- Take the measurement two or three times to confirm accuracy
- The helmet should fit snugly without causing discomfort
- If the helmet moves when worn, size down by one
Specifications
- Brand: Just1
- Model: J-STR Astro
- Type: Full-face helmet
- Colour / finish: Red / Blue / Black gloss
- Outer shell: ABS in 2 shell sizes
- Inner shell: EPS in 2 sizes
- Certification: ECE 22.06, DOT
- Lining: Removable and washable, Protx2 antimicrobial treatment
- Visor: Wide Vision, scratch-resistant, Pinlock 70 prepared
- Closure: Double-D ring
- Emergency system: J.I.E.R. Emergency Cheek Pads Removal System
- Part number: 6030390112007
| Brand | Just1 |
|---|---|
| Model | J-STR Astro |
| Type | Full-face helmet |
| Colour / Finish | Red / Blue / Black gloss |
| Outer shell | ABS in 2 shell sizes |
| Inner shell | EPS in 2 sizes |
| Certification | ECE 22.06, DOT |
| Visor | Wide Vision, scratch-resistant, Pinlock 70 prepared |
| Part number | 6030390112007 |
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Just1 J-STR Astro Red / Blue / 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 Astro Full-Face Helmet – Red / Blue / Black Gloss
Tech specs
- Brand
- Just1
- Model
- J-STR Astro
- Type
- Full-face helmet
- Colour / Finish
- Red / Blue / Black gloss
- Outer shell
- ABS in 2 shell sizes
- Inner shell
- EPS in 2 sizes
- Certification
- ECE 22.06, DOT
- Visor
- Wide Vision, scratch-resistant, Pinlock 70 prepared
- Part number
- 6030390112007
- 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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