Stilo ST6 GT Zero Carbon Helmet 1-AA0802CG3R-GSM Performance Stilo ST6 GT Zero Carbon Helmet From £4,484.40 Incl. VATFrom £3,737.00 Excl. VAT
Stilo ST6 FN Composite Helmet 1-AA0810AG2V-GSM Performance Stilo ST6 FN Composite Helmet From £800.40 Incl. VATFrom £667.00 Excl. VAT

Stilo ST6 FN Carbon Helmet

From £1,189.00 Excl. VAT

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The Stilo ST6 FN Carbon Helmet delivers ultra-lightweight and exceptional head protection, thanks to its high-tensile carbon fibre shell designed to reduce strain on neck muscles. This FIA 8860-approved helmet is one of the lightest in its class, free from electronics and side ports, and engineered for maximum safety and performance. Designed for long races and high-speed open cockpit driving, the Stilo ST6 FN Carbon Helmet ensures optimal protection without compromising on comfort. Its advanced aerodynamics minimise noise and drag, enhancing the driving experience during intense race conditions. The helmet’s ventilation system keeps you cool and prevents visor fogging, ensuring clear visibility and focus when it matters most. With its redesigned cheek padding and customisable fit, this helmet provides improved comfort, stability, and support throughout long and demanding events. Experience the perfect balance of lightweight design, safety, and comfort with the Stilo ST6 FN Carbon Helmet.

Approval:

  • FIA 8859-2024 and Snell SA2020 Approved

Key Features:

  • Standard tensile carbon fibre shell: Made with PURO technology, reducing weight and eliminating the need for a clear coat, while providing exceptional strength and protection without extra bulk.
  • Up to 10% weight reduction: Lighter than the previous ST5 FN Carbon model by up to 10%, starting from just 1180g (Small shell), reducing neck strain and improving comfort.
  • No electronics or side ports: Removal of these components further reduces weight, helping prevent muscle fatigue during long races.
  • FIA 8859-2024 compliant: Meets the latest FIA homologation standards, offering enhanced safety with superior impact energy absorption.
  • Revised ventilation system: Six chin bar vents, crown vents, and padding channels provide optimal airflow, keeping you cool and preventing visor fogging.
  • Improved visor design: High-performance anti-fog treatment ensures long-lasting clarity without washing off.
  • Smoother visor pivot kit: Updated pivot mechanism for easier operation and fitment, enhancing performance in high-pressure conditions.
  • Wider aperture for better vision: Increased downward vision improves awareness of surroundings, contributing to both safety and performance.
  • Updated cheek padding: Redesigned for a closer fit and improved stability, with customisable thickness options (sold separately) for better support.
  • Advanced padding technology: Special airflow channels keep the helmet interior cooler, reducing fatigue.
  • Enhanced aerodynamics: Optimised for open cockpit racing, reducing wind noise and drag, helping you stay focused on the track.
  • Pioneering visor locking: One-handed operation and strict safety compliance in both fully closed and ventilated positions.
  • Intercom and drink tube channels: Built-in channels for easy retrofitting of intercom or hydration systems.
  • Includes factory fitted FHR Posts.

Additional information

Brand

Approval

,

Material

Communication

HANS Posts

Product Type

Motorsport helmet size guide

Helmet letters mean less here than anywhere else on the site. At 58 cm round the head you are a Bell M, a Sparco M and an Arai M, but a Stilo L and a Schuberth L. Measure once, then read your own number off the chart for the brand you are buying.

Measure your head

Bell put it best on their own guide, and every brand here measures the same way. Take the circumference about an inch above your eyebrows at the front, and at whatever point at the back gives you the biggest number. Take it three or four times and use the largest reading.

1Soft tape, level all the way roundA cloth tape, not a steel one. If the tape dips at the back you will read short.
2One inch above the eyebrowsThen around the widest part of the back of your head.
3Take it more than onceUse the biggest reading you get, not the average.
4Hair downMeasure as you would drive. A ponytail or a thick balaclava changes the answer.

Your size in every brand we stock

Find your measurement in the left column. A dash means that brand does not make a size at that measurement, not that it is out of stock.

Head cm Bell Bell HP/Pro Stilo Sparco Arai Schuberth Zamp OMP
53 XXS – – XS XS – XS XXS
54 XXS XXS XS XS XS XS XS XS
55 XS XS S S S S XS XS
56 XS S – S S – S S
57 S S M M M M S S
58 M M L M M L M M
59 L L L ML L L M M
60 L L – L L L+ L L
61 XL XL XL XL XL L+ L L
62 XXL 61+ – XXL XL XL XL XL
63 XXL – XXL – XXL XXL XXL XL
64 3XL – XXXL – XXL – XXL –

Sparco column is the Stealth RF ladder, which is what almost everything we stock from them uses. OMP column is the GP-R. Bell HP/Pro covers their HP, Carbon and Pro models, which use a different chart from the rest of the Bell range.

What catches people out

Bell run two different charts

Bell publish one chart for most of the range and a second for the HP, Carbon and Pro models. They are not the same. On the general chart a 56 cm head is an XS; on the HP, Carbon and Pro chart the same head is an S. That is why some Bell helmets on the site are sold as S, M, L and others as 54cm, 55cm, 56cm and so on up to 61+. The numbered ones are the HP, Carbon and Pro models and you pick your measured size directly.

Stilo run small, and skip some sizes

Stilo say it themselves: their helmets “run traditionally a hair smaller than other sizes on the market”. On top of that the ST6 ladder steps unevenly, so 56, 60 and 62 cm have no size of their own. If you measure at one of those, or you are on a boundary anywhere in the Stilo range, go up rather than down and ring us first.

A shell size is not a helmet size

Every brand here builds a handful of outer shells and then changes the padding inside to make the sizes. Going up a size inside the same shell costs you nothing in bulk or weight. Crossing into the next shell up makes the helmet visibly bigger and noticeably heavier, which you feel over a long stint and which matters if you are tight for room in the car.

Range Shells Which sizes share a shell
Stilo ST5 full face 2 Small 54 to 59, large 60 to 64
Stilo Venti open face 3 Small 54 to 58, medium 59 and 61, large 63 and 64
Stilo Sport 2 Small XS to M, large L and XL
Schuberth SF4 and SP1 2 Small XS to L, large L+ to XXL
Sparco Stealth RF 2 Seven sizes over two shells
Arai up to 6 Roughly one shell per two sizes

Shell splits published by Stilo and Schuberth. Arai build more outer shells than anyone else here and also offer different shell shapes for rounder and longer heads, which is worth knowing if other brands have never quite fitted you.

Full charts by brand

Bell, general rangeGT6, RS7, Mag, X-1, K1 and the rest. 51 to 68 cm.▼
Head cm Size Hat size
51 4XS 6 3/8
52 3XS 6 1/2 – 6 5/8
53 – 54 XXS 6 3/4 – 6 7/8
55 – 56 XS 7
57 S 7 1/8 – 7 1/4
58 M 7 1/4 – 7 3/8
59 – 60 L 7 1/2
61 XL 7 5/8 – 7 3/4
62 – 63 XXL 7 7/8 – 8
64 – 65 3XL 8 1/8 – 8 1/4
66 – 68 4XL 8 3/8 – 8 1/2
Bell, HP / Carbon / ProHP6, HP7, HP10, HP77, GT6 Carbon, RS7 Carbon. Sold by measured size.▼
Head cm Size Hat size
54 XXS 6 3/4 – 6 7/8
55 XS 7
56 – 57 S 7 1/8 – 7 1/4
58 M 7 1/4 – 7 3/8
59 – 60 L 7 1/2
61 XL 7 5/8 – 7 3/4
61+ XL 7 5/8 – 7 3/4

These are the models listed on the site as 54cm, 55cm and so on. 61+ is Bell’s largest liner in this range.

StiloST6 GT, GTN, FN and the Venti range. Runs slightly small.▼
Size Head cm
XS 54
S 55
M 57
L 58 – 59
XL 61
XXL 63
XXXL 64

The Venti Trophy Rally range uses a different, continuous ladder: XS 53-54, S 55-56, M 57-58, L 59-60, XL 61-62, XXL 63-64. If the uneven steps above put you between sizes, that range may cover you.

SparcoStealth RF, Stealth RF Carbon, Flux RJ-i and the RJ range.▼
Size Head cm
XS 53 – 54
S 55 – 56
M 57 – 58
ML 59
L 60
XL 61
XXL 62

Sparco also publish a generic six size chart (XS 53-54, S 55-56, M 57-58, L 59-60, XL 61-62, XXL 63-64). The seven size ladder above, with an ML at 59 cm, is the one the Stealth RF range actually uses, so go by that for the helmets we stock.

AraiGP-6S, GP-7, GP-Jet 3. The most shell sizes of any brand here.▼
Size Head cm
XS 53 – 54
S 55 – 56
M 57 – 58
L 59 – 60
XL 61 – 62
XXL 63 – 64
SchuberthSF3, SF4 and SP1. Note the L+ size between L and XL.▼
Size Head cm Shell
XS 54 Small
S 55 Small
M 57 Small
L 58 – 59 Small
L+ 60 – 61 Large
XL 62 Large
XXL 63 Large
Zamp and OMPSmaller ranges. Neither publishes a chart, so these are the sizes as we list them.▼
Brand Size Head cm
Zamp XS 53 – 55
Zamp S 56 – 57
Zamp M 58 – 59
Zamp L 60 – 61
Zamp XL 62
Zamp XXL 63 – 64
OMP GP-R
OMP XXS 52 – 53
OMP XS 54 – 55
OMP S 56 – 57
OMP M 58 – 59
OMP L 60 – 61
OMP XL 62 – 63

The OMP J-Rally uses a different ladder again: S 57-58, M 58-59, L 60-61, XL 61-62. Ring us for that one.

How a helmet should fit

Tight, then tighter than you think

A new helmet should be snug enough that it is slightly awkward to pull on, and the cheek pads should push your cheeks up. The lining compresses with use, so a helmet that is merely comfortable in the showroom will be loose by the end of the season. Do the roll-off test: with the strap done up, take the back of the helmet and try to rotate it forwards off your head. If it moves, it is too big.

Open face and full face are not the same fit

An open face sits differently because there is no chin bar pulling the shell forward, and several brands build their open face range on a separate set of shells. If you are moving from one to the other, do not assume your size carries across. Stilo in particular build the Venti open face on three shells and the ST full face on two.

Glasses

Say so when you order. Some models take a glasses channel in the cheek pads and some do not, and it is much easier to sort out before the helmet ships than to feed the arms in afterwards.

Buying a helmet and a head restraint together?The helmet needs FHR anchor posts fitted, and where a helmet is sold as a package here it already has them. If you are buying the two separately, tell us and we will make sure the posts and the tether length match the helmet you have chosen.
Send us your measurementGive us your head circumference in centimetres and the model you are looking at. Helmets are the one thing worth getting right first time, and we would far rather check it with you than process a return. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Bell from bellracing.com. Stilo shell and fit information from stilohelmets.com. Sparco generic chart via Racecar Engineering, model ladder from the range we stock. Arai from whyarai.co.uk. Schuberth from their published SF4 and SP1 data. Zamp and OMP from the sizes on the products themselves. All checked 2 August 2026. If the chart in the box disagrees with this page, the box wins and we would like to know.

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