AT4.0 CARBON

Daimyo

CA$374.50 CA$749.00
3422 reviews
Rated 4.5 out of 5 stars
5 stars (2642)
4 stars (317)
3 stars (161)
2 stars (96)
1 star (206)
CONNECT WITH
Audio + Call Ready
COMPATIBLE WITH
Shockwave Audio
CERTIFICATIONS
DOT ECE 22.06 SHARP 4*
 
Specs & Description

Laced with gold trim, the Daimyo draws its style from Japan's shogun warriors. Silk red decal weaves together ancient traditions that allow you to strike with furious precision.

The AT4.0 full-face motorcycle helmet ticks all the boxes for safety, comfort and style. Composed of multi-layered, multi-density foam, our tailor-made cheek pads intelligently contour around your face for a custom fit.

The AT4.0 headliner has been enhanced with RHEON™ technology that helps reduce impact and rotational forces using reactive polymers for increased energy dissipation. Fully ECE 22.06 certified, the AT4.0 is our safest helmet yet.

The streamline carbon fibre shell features fully adjustable front and top vents for precise temperature control and improved acoustics to reduce turbulence and wind noise.

The AT4.0 is a fully Bluetooth compatible motorcycle helmet when used with the Shockwave Bluetooth audio insert (sold separately). Featuring sound engineering by Harmon Kardon, the Shockwave integrates seamlessly into the AT4.0.


Your AT4.0 can be customised with our range of helmet visors. We offer seven additional coloured visors that can be changed in a matter of seconds with our tool-less thumbscrew mechanism. Your AT4.0 comes as standard with a clear visor installed and a tinted visor included in the box.

What's in the Box - AT4.0 CARBON
What's in the box overview image What's in the box
(Helmet style not shown)
Clear & Tinted Visors Clear & Tinted Visors
Sound dampening ear inserts Sound dampening inserts
Maverick Mask Soft helmet bag
  • AT4.0 CARBON Helmet
  • Tinted Visor
  • Clear Visor
  • Sound dampening ear pads
  • Soft helmet bag
3 year warranty

Ruroc warrants motorcycle helmets to be free of defects in material or workmanship for a period of 3 years from the date of purchase. The warranty is for the original purchaser only (non-transferable). If a product fails due to a manufacturing defect within the warranty period, Ruroc will repair or replace it free of charge, subject to the warranty terms and valid proof of purchase.

What's not covered?

What isn’t covered includes normal wear and tear, damage from accidents/falls/impact, cosmetic ageing/fading due to the elements, and any indirect, incidental, or consequential loss of any kind. For a complete list of what’s not covered, please check our full warranty details.

Crash Replacement (optional add-on)

Crash Replacement is an additional purchase (it's automatically added to your cart when you add a helmet) that covers accidental damage (drops/crashes). If your helmet is damaged in a crash or accident, it lets you replace it with 50% off a new Ruroc motorcycle helmet, as long as it’s redeemed within the helmet’s warranty period and in line with the scheme terms. Full Crash Replacement details can be found in our Terms & Conditions.

View full warranty details here.

Delivery & Returns
  • Delivered via UPS TRACKED EXPRESS from our UK Headquarters
  • FLAT-RATE SHIPPING of CA$45
  • Duties and taxes may apply
  • EASY EXCHANGES via our exchanges portal
  • EASY RETURNS via our returns portal
Import charges are set by Canadian customs and may vary depending on your order and province. Return label costs apply.
Helmet with DOT and ECE certification
DOT Certified
ECE 22.06 Certified

Seal of Approval.

AT4.0 CARBON is engineered for safety performance, exceeding ECE 22.06 requirements by a minimum of 20%, and carrying DOT approval and a SHARP 4-star rating.

Helmet interior padding

Ultimate Comfort

The fully re-engineered internals, including head-liner and cheek pads, take fit, comfort, acoustic control and support to a whole new level.

RHEON™ Protection

The world’s first road-ready motorcycle helmet to feature RHEON™ technology. Next-level protection seamlessly integrated into the AT4.0 head-liner.

Shockwave Bluetooth audio system
Bluetooth

Protection Meets Connection

AT4.0 CARBON is compatible with the Shockwave Bluetooth audio system. Featuring seamless helmet integration, the Harman Kardon designed and tuned unit delivers rich & crisp audio.

215 degree field of view

Maximum Vision

Featuring 215° horizontal and 100° vertical field of vision, the AT4.0 edge-to edge visor maximises peripheral vision. Anti-scratch dipped, Pinlock 70 compatible, and made from Optical Grade Ballistic Polycarbonate, this is vision reinforced.

Helmet ventilation system

Full Climate Control.

Take full control of your helmet environment with open/close vents & tune your thermal comfort in both warm and cool climates.

FAQs

How do I know what size AT4.0 CARBON motorcycle helmet to get?

Take a fabric measuring tape, wrap it around your head just above your eyebrows and ears. Pull the tape until comfortably tight. Take the measurement. Our motorcycle helmet fit is intermediate oval.

How tight should the AT4.0 CARBON motorcycle helmet be?

A helmet should feel snug, with even pressure around your crown and a firm cheek bite. Cheek pads bed in over time, so it shouldn't feel loose (or "perfect") straight away. There should be no helmet movement when turning from side to side. A snug fit is essential for safety.

Does carbon fiber perform better?

Carbon fiber delivers a perfect balance of light weight and superior impact absorbing characteristics, making it a great choice for motorcycle helmets.

What is RHEON™?

It's impact tech that hardens on crash impact, preventing injuries from linear and rotational impacts. Standard headliners can't do this. RHEON™ can.

What buckle does the AT4.0 CARBON motorcycle helmet use? Is it safe?

Fidlock. It's magnetic + mechanical. The magnet pulls the tab in. The mechanical lock holds it. To open, pull tab which will open the mechanism. Wind won't open it. Crashes won't open it. It's much quicker to use than a double D-ring and just as safe.

How do I clean the AT4.0 CARBON motorcycle helmet visor without scratching it?

Rinse the visor first, grit is the enemy. Use mild soap and a microfiber towel. Wipe off. For longlasting protection, order one of our Muc-Off Helmet Cleaning Kits.

It looks like you're based in
Find your size
We recommend:
How to measure
  1. With a fabric measuring tape, wrap it around your head just above your eyebrows and ears.
  2. Pull the tape comfortably tight. Take the measurement.

Our motorcycle and snow helmet fit is an intermediate oval.

Returns policy

If the fit is not quite right our return process is simple. 14 days to exchange, picked up from home. See our returns page for more details.

Reviews for AT4.0 Carbon Range

All reviews are from verified customers

4.5 /5
3422 Reviews
FabioJuly 8 2026
Best helmet i ever had beautiful slick and very confy to hear and the vision is amazing ,can see the world now!
J.ReverzJuly 7 2026
Love this helmet! Although the sizing chart is off, and I had to exchange for the next size larger.
Monica BivasJuly 7 2026
Beautiful, and confortable design.
Nuno CostaJuly 7 2026
In the future will buy more
Ducati DucDucGoJuly 6 2026
Aerodynamics make a noticeable positive riding experience Other helmets at highway speeds I feel my head whipping and snapping and am in pain the moment I get off the bike That is completely gone with AT Carbon I LOVE the visor visibility and clarity - I legit sometimes don’t even know whether the visor is down or not it’s that crystal clear Love everything about this helmet
Nicholas BJuly 6 2026
Excellent helmet, amazing quality and wicked comfortable. It’s light weight and my neck doesn’t fatigue after a few hours on the road. And the shockwave is sick!! Great sound
Pavel AngererJune 30 2026
People always look twice when I drive by.
Gena June 29 2026
Spectacular! Great looking and so light weight!
Vincent AubeleJune 29 2026
Il est magnifique et parfait
david hurtadoJune 26 2026
Not much to say about it , light weight , comfortable, good helmet
Jake BrawleyJune 25 2026
Good looking helmet nice snug fit super light easily change out visors 10/10 do recomend
Aedan BarreraJune 25 2026
The helmet fit very good, and the shockwave set sounds really good.
Slowboy SangsterJune 25 2026
perfect fit excellent quality .well worth the money.
Vassilev RoussiJune 24 2026
The helmet is really very good and light but unfortunately it is a bit matte I would like it to have a glossy varnish and shine more but I am satisfied overall I like it
Stratos PatsellisJune 24 2026
The best of
Stuart ChalliesJune 24 2026
Amazing helmet. I love it
Chad TaylorJune 23 2026
Beautiful design. All my fellow riders always comment about this helmet
Emlyn WilliamsJune 23 2026
Very nice ,fits nicely. Very comfortable.
Rob JonesJune 22 2026
Very pleased Top quality product..very fast delivery Great support from supplier
Daniela WenzlJune 22 2026
The product was very well made and looked great, but unfortunately it was too small for me.