Bell Carbon KC7-CMR Kart Helmet

From £996.00 Incl. VATFrom £830.00 Excl. VAT

Snell-FIA CMS 2016-approved helmet. Measure above your eyebrows, match the centimetres, and call us if you sit between sizes.

Helmet Size

52cm

53cm

54cm

55cm

56cm

57cm

58cm

59cm

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Size/Fitting guide

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Bell continues to innovate with the KC7 CMR Carbon, the first ultra-lightweight carbon youth karting helmet on the market. Based on the advanced HP7 and incorporating the same performance technology, this sleek, aerodynamic design features an advanced ventilation system with 14 air intake and extraction channels designed to maximize cooling and a double screen anti-fog (DSAF) insert to prevent fogging in rain conditions. Certified to the FIA/Snell CMR standard designed for karting drivers under the age of 15, the KC7 CMR Carbon is a winning choice for the next generation of champion drivers.

Approval:

Snell CMR-2016 approved

Key Features:

Includes top and side clear air intakes for improved ventilation and cooling
Optimized shell and shield design resulting in improved aerodynamics
Non fireproof lining for extra durability
Ultra-lightweight carbon shell

Additional information

Brand	Bell
Approval	Snell-FIA CMS 2016
Material	Carbon
Helmet Size	52cm, 53cm, 54cm, 55cm, 56cm, 57cm, 58cm, 59cm
Communication	Not Included
HANS Posts	Not Included
Colour	Carbon
Product Type	Motorsport, Karting

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.

Have you written anything about this exact product?
Yes, we have covered this exact product: Three CMR Kart Helmets, One Approval: What Does The Extra Money Buy?. That is first-hand coverage from our own builds and showroom, not brochure copy.

How do I get the right size?
Measure around your head at the widest point, about an inch above your eyebrows, and match the centimetres to the size options (this one runs from roughly 52cm to 59cm). The fit should be snug all round with no pressure points, and it should not rotate when you shake your head. Between sizes, try the smaller one first, as linings bed in. Our helmet buying guide covers fit in detail, or call us and we will talk it through.

Is it legal for UK motorsport?
Approvals vary between versions of this helmet, so check the standard printed on the label against the current Motorsport UK list before an event, or ask us and we will confirm for the exact lid we ship you. Our guide to FIA and Snell helmet standards explains what each standard means.

Does it work with a HANS device?
HANS posts are not fitted as standard on this one. Tell us which FHR device you run and we will confirm the right post kit before you order. Our guide on which HANS device you need is the place to start if you are new to them.

Do visor tear-offs fit this helmet?
It depends on the visor system rather than the helmet model name, and not every helmet takes them. Our tear-offs compatibility guide lists which of our helmets accept tear-off posts, or ask us and we will check the exact visor fitted to this one.

How do I look after it?
Store it in its bag away from heat and direct sun, clean the shell with mild soap and water only (solvents attack the finish and the shell), and let the lining air out after use. And the big one: after any significant impact, replace the helmet even if it looks fine, as the protective liner is designed to crush once.

Availability

Bell comes from central distribution

Stocked Bell items take around 10 working days. Special order items extend to around 20 days.

Much of the range is special order

A great deal of the Bell range is special order, the helmets especially, and those can run past 20 days. Contact us with the model, size and colour you want and we will get you the real date.

Before you order

Worth doing before you buy rather than after, because a helmet is the item most likely to be built rather than picked.

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.

Spread the cost with Klarna

Choose Klarna at checkout and pick the plan that suits you. The options and amounts for this product are shown below, and they update when you choose an option above.

Use the purchase power check in the Klarna box for a quick, no-obligation look at what you could be approved for before you order.

How it works at GSM Performance

1Add the product to your basket and go to checkout as normal.
2Select Klarna as your payment method and choose your plan. Klarna gives you a decision in seconds.
3We dispatch straight away. You pay Klarna on the schedule you chose, and any refund goes back through Klarna.

Your questions, answered by Klarna

Klarna is available to UK residents aged 18 and over. Subject to status. Terms and conditions and late fees apply. Klarna Financial Services UK Limited is authorised and regulated by the Financial Conduct Authority. Full details at klarna.com/uk. Every way you can pay with us is on our payment and finance page, or call 0115 989 3488 and we will talk it through.

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