Stilo ST6 CMR Carbon Lite Kart Helmet-Carbon-AA0821AH5P-GSM Performance-1 Stilo ST6 CMR Lite Carbon Kart Helmet From £445.50From £445.50
Stilo ST6 KRT Composite Kart Helmet Stilo ST6 KRT Composite Kart Helmet From £502.00From £502.00

Stilo ST6 CMR Zero Carbon Kart Helmet

From £737.00

Inc/Exc VAT
Found this product at a lower price?
SKU: AA0822AH1P Category:

Free UK shipping on all orders over £100

  • Personalized order tracking
  • Over 20 years of technical experience
  • In-store appointments available

 

Guaranteed Safe Checkout

The Stilo ST6 CMR Zero Carbon Helmet is engineered for competitive karting where low weight, visibility, and driver comfort are essential for consistent performance. Built from high-grade carbon fibre, the helmet delivers an exceptionally light yet strong shell that meets the strict Snell CMR2016 karting safety standard
Developed using technology derived from Stilo’s Formula One research, the ST6 CMR Zero features a refined shell design, improved ventilation, and an expanded field of view to support driver focus in demanding racing conditions. The compact shell profile reduces overall weight and external size, helping minimise neck fatigue during longer sessions while maintaining the structural protection required for high-level karting competition.

With its ultra-light construction, compact shell design, and advanced ventilation, the Stilo ST6 CMR Zero Carbon Helmet helps reduce fatigue while maintaining high levels of safety and stability at racing speeds. It is a performance-focused choice for karting drivers seeking professional-grade protection and comfort.

Key Features

  • Full carbon fibre shell construction – Manufactured using ultra-light, high-strength carbon fibre for excellent rigidity and impact energy management while keeping weight extremely low (from approximately 970g for the XS shell).
  • Refined shell sizing system – Two compact shell sizes improve fit and aerodynamics: XS (53–56cm) weighing around 970g, and S (57–59cm) weighing approximately 1010g.
  • Double-glazed 3mm visor – FIA-approved visor design helps reduce fogging and maintains clear vision in varying weather and temperature conditions.
  • Updated visor locking mechanism – Secure locking system keeps the visor firmly closed at speed or during impact for improved reliability and safety.
  • Optimised internal ventilation – Carefully designed airflow channels assist heat management and breathability, helping keep drivers cooler during long sessions.
  • Expanded field of vision – Enlarged eye port improves downward and peripheral visibility for better track awareness and faster visual reference changes.
  • Aerodynamic accessory compatibility – Designed to accept optional front and rear spoilers (available separately) for aerodynamic fine-tuning.
  • Optional coloured interior linings – Special-order interior colours including blue, yellow, red, pink, green, and orange allow subtle personalisation.

Approval:

  • Snell-FIA CMR 2016.

Additional information

Brand

Approval

Material

Colour

Helmet Size

, , , , ,

Communication

HANS Posts

Product Type

Interior Lining Colour

, , , , , ,

Karting helmet size guide

Kart helmet sizing is model by model rather than brand by brand. Sparco alone run six different ladders across their kart range, and none of them matches their car helmet ladder. The good news is that every size on this site carries the head measurement inside the size name, so you can ignore the letter completely.

Read the number, not the letterOur size options are written like “M (57cm-58cm)”. Measure your head once and pick the option whose centimetre range contains your number. That is all you need to do, and it works across every brand and model on the site.

Measure the head

1One inch above the eyebrowsThen round the widest part at the back. Soft tape, level all the way round.
2Take the largest readingMeasure three or four times and use the biggest number you get.
3Hair as you driveMeasure with the hair down or tied as it will be under the helmet.
4Children grow, helmets do notBuy to the measurement today. A helmet bought big to last two seasons moves on the head, and you will be replacing it anyway when it is outgrown.

The homologation decides how big the helmet goes

This is the thing that catches parents out. Snell-FIA CMR is the junior standard and every CMR helmet we stock stops at around 59 cm, because it is designed for a child. If your driver measures more than that, a CMR helmet does not exist in their size and you need a CMS, a Snell K or an FIA 8878 helmet instead. Check which your series accepts before you shop.

Helmet Homologation Size range
Snell-FIA CMR 2016, the junior standard
Bell KC7-CMR Snell-FIA CMR 2016 54 – 59 cm
Bell KC7-EV CMR Snell-FIA CMR 2016 51 – 59 cm
Stilo ST5 CMR Snell-FIA CMR 2016 54 – 59 cm
Stilo ST6 CMR Zero and Lite Snell-FIA CMR 2016 53 – 59 cm
Sparco Stealth CMR Snell-FIA CMR 2016 53 – 59 cm
Sparco GP KF-4W CMR Snell-FIA CMR 2016 54 – 59 cm
Arai CK-6 Snell-FIA CMR 2016 51 – 60 cm
Stilo ST5F N KRT Snell-FIA CMR 2016 54 – 64 cm
Snell-FIA CMS 2016, the same shell for seniors
Bell KC7-EV CMS Snell-FIA CMS 2016 51 – 59 cm
Bell Carbon KC7-CMR Snell-FIA CMS 2016 52 – 59 cm
Senior kart standards
Stilo ST6 KRT FIA 8878-2024, Snell K2025 54 – 64 cm
Bell RS7-K Snell K2020 54 – 61 cm
OMP GP-R K Snell K2020 52 – 63 cm
Arai SK-6 Snell K2015 53 – 62 cm
Sparco Air KF-7W, Sky KF-5W Snell K2015 53 – 62 cm
ECE 22-06, practice and arrive-and-drive
Sparco X-Pro ECE 22-06 53 – 63 cm
Sparco Club X1 ECE 54 – 65 cm
OMP Circuit Evo 2 ECE 22-06 53 – 61 cm

ECE 22-06 helmets are road motorcycle homologated. They are popular for practice, arrive-and-drive and indoor karting, and they cover the widest size range, but most competition series will not accept them. Check your regulations first.

Ladders by brand

All measurements are head circumference in centimetres.

BellNumeric on most kart models. Pick your measured size.▼
Model Sizes
KC7-CMR 54, 55, 56, 57, 58, 59
KC7-EV CMR and CMS 51, 52, 53, 54, 55, 56, 57, 58, 59
Carbon KC7-CMR 52, 53, 54, 55, 56, 57, 58, 59
RS7-K Carbon 54, 55, 56, 57, 58, 59, 60, 61
RS7-K S 57-58, M 58-59, L 60-61, XL 61 to 61+
StiloLettered, and the ST6 KRT offers two different L liners.▼
Model Sizes
ST5 CMR XS 54, S 55, M 57, L 59
ST5 CMR Carbon XS 54, S 55-56, M 57, L 59
ST6 CMR Zero and Lite XXS 53, XS 54, S 55, S 56, M 57, L 59
ST6 KRT XS 54, S 55, M 57, L 58, L 59, XL 61, XXL 63, XXXL 64
ST5F N KRT XS 54, S 55, M 57, L 59, XL 61, XXL 63, XXXL 64

Stilo state their helmets run slightly smaller than other brands, so if you are on a boundary go up. The ST6 KRT lists an L at 58 cm and an L at 59 cm; those are two liner thicknesses in the same shell.

SparcoSix different ladders. Read the centimetres in the size name.▼
Model Sizes
Stealth CMR XS 53-54, S 55-56, M 57-58, L 59
GP KF-4W CMR XS 54-55, S 56, M 57-58, L 59
Air KF-7W, Sky KF-5W XS 53-54, S 55-56, M 57-58, ML 59, L 60, XL 61, XXL 62
X-Pro S 55-56, M 57-58, L 60, XL 61, XXL 62
X-Pro Gulf and Martini XS 53-54, S 55, M 56-57, L 58-59, XL 60-61, XXL 62-63
Club X1 Carbon XS 54-55, S 56-57, M 58-59, L 60-61, XL 62-63, XXL 64-65

None of these matches Sparco’s car helmet ladder, and several do not match each other. A Sparco kart M can be 56-57, 57-58 or 58-59 cm depending on which model you are looking at.

OMP and AraiBoth use the same ladders as their car helmets.▼
Model Sizes
OMP GP-R K XXS 52-53, XS 54-55, S 56-57, M 58-59, L 60-61, XL 62-63
OMP Circuit Evo 2 XS 53-54, S 55-56, M 57-58, L 59, XL 60, XXL 61
Arai CK-6 XXS 51-52, XS 53-54, S 55-56, M 57-58, L 59-60
Arai SK-6 XS 53-54, S 55-56, M 57-58, L 59-60, XL 61-62

How it should fit

Snug enough that it is slightly awkward to pull on, with the cheek pads pressing the cheeks up. With the strap done up you should not be able to rotate the helmet forwards off the head. The lining beds in over the first few sessions, so a helmet that feels merely comfortable in the box will be loose by the end of the season.

For a child, check it again at the start of every season rather than assuming last year’s helmet still fits. Heads grow faster than you expect and the fit goes off before the helmet looks any different.

Tell us the series as well as the measurementHead circumference in centimetres and which championship or club you are running in. The homologation narrows the choice more than the size does, and we would rather get both right at once. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Ladders read from the size options on our own products, which carry the head measurement in the size name. Bell numeric models follow Bell’s published HP, Carbon and Pro chart. Arai and OMP kart ladders match their published car ladders. All checked 2 August 2026.

Offer 1: Pick your free gift!

  • Offer 1: Pick your free gift.
  • We're giving away free gifts when you purchase any racing helmet over £400.
  • Simply add your helmet of choice to your basket, and checkout.
  • A popup will then appear, where you can pick which free gift you want to receive. It's as easy as that!

Offer 2: Automatic free gift!

  • Offer 2: Automatic free gift.
  • We're giving away a gift box full of goodies or a face mask with every order.
  • Simply pick which one you want on the checkout screen

Offer 3: 10% off racing suits!

  • Spend over £500.00 on any FIA racing suit and receive an instant 10% discount.
  • Simply add your suit of choice to your basket and checkout.
  • Your 10% discount will be instantly added to your product. No product code needed!

Offer 3: 5% off your first order!

  • Spend over £150.00 on checkout and receive an instant 5% discount on your first order with GSM Performance.
  • Add the code: New-GSM5 in your shopping basket and the discount will be instantly added to your product entire order.

At GSM Performance, our priority is to maintain the utmost hygiene and quality standards for the benefit of our customers. To that end, we have instituted a policy that all purchases of long johns, balaclavas, tops, and underwear are final and non-returnable. This policy is necessary due to the personal nature of these items, which are worn in close contact with the body. This protocol is intended to guarantee the health and safety of all our customers.

This policy adheres to the best industry practices and safeguards both our customers and our staff. It's important to clarify that this policy does not affect your statutory rights as a consumer. This policy does not apply if you receive damaged or defective products. In such cases, our customer service team is available to promptly address your concerns and arrange a replacement or refund. We greatly appreciate your understanding and adherence to our hygiene policy and thank you for your continued confidence in GSM Performance. For further information please see our terms and conditions which are agreed on checkout. 

Related products

  • Bell KC7-CMR Kart Helmet WhiteBell KC7-CMR Kart Helmet-Edited-GSM Performance
    SALE
    Klarna Ready

    Bell KC7-CMR Kart Helmet
    From £425.00 Select options This product has multiple variants. The options may be chosen on the product page
  • Bell KC7-CMR Carbon – GSM PerformanceBell KC7-CMR Carbon – GSM Performance
    SALE
    Klarna Ready

    ,

    Bell Carbon KC7-CMR Kart Helmet
    From £830.00 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
  • Arai SK-6 Kart HelmetArai SK-6 Kart Helmet-Edited-GSM Performance
    SALE
    Special Order
    Klarna Ready

    Arai SK-6 Kart Helmet
    From £412.00 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
  • OMP Circuit Evo 2 Helmet - Fluro YellowCircuit Evo 2 Fluro Yellow-OMPSC0-0616-A01-099-GSM Performance
    SALE
    Try in-store
    Amazing value
    0% pay-in-3

    ,

    OMP Circuit Evo 2 Helmet – Fluro Yellow
    From £90.00 Select options This product has multiple variants. The options may be chosen on the product page