Sparco GP KF-4W CMR Karting Helmet

From £360.00 Incl. VATFrom £300.00 Excl. VAT

Helmet Size

XS (54cm-55cm)

S (56cm)

M (57cm-58cm)

L (59cm)

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Size/Fitting guide

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The Sparco GP KF-4W, a karting helmet certified to Snell-FIA CMR 2016. Part number SKW003358.

CMR is the standard that matters if you are buying for a young driver. Motorsport UK require CMR or CMS helmets for under 15, Cadet and Bambino karting, with a weight limit attached, and an ordinary karting helmet to a Snell K standard does not satisfy that however light it is. If the driver is under 15, this is the category of helmet you need.

It is also recommended between 15 and 18, and plenty of parents keep a CMR lid until the driver has stopped growing.

Why CMR exists

A child’s neck cannot carry an adult helmet safely. CMR helmets are built to a lower weight limit and tested against a standard written around younger drivers, which is why the shell is a lightweight composite reinforced with additional layers rather than a scaled down adult lid.

Specification

Composite shell, white, in XS at 54 to 55cm through to L at 59cm. No head and neck restraint posts and no communication kit.

Measure round the head just above the eyebrows with a tape rather than guessing, and check the current Motorsport UK regulations for the class before you buy. Standards lists change and we would rather you had the right lid than a nearly right one.

Additional information

Brand	Sparco
Approval	Snell-FIA CMR 2016
Material	Composite
Colour	White
Helmet Size	XS (54cm-55cm), S (56cm), M (57cm-58cm), L (59cm)
Communication	Not Included
HANS Posts	Not Included
Product Type	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.

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 54cm 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 competition karting?
This helmet carries Snell-FIA CMR 2016, a karting standard. CMR and CMS are the youth standards, the only ones accepted for karters under 15, so this is the right type of lid for cadet and junior classes. Karting standards are separate from the car racing list, so if you also race cars you will need a helmet from our motorsport helmet range. Check your club or championship regulations for the accepted list.

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.

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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.