HJC F100

The HJC F100 is an ECE 22.06 rotational modular motorcycle helmet. Its chin bar rotates over the crown to change between full-face and open-face configurations, while an HJ-45 clear outer visor and an adjustable HJ-V12 internal sun shield manage changing weather and light.

Moto Central's range includes Advanced Fibreglass Composite F100 helmets, F100 Carbon versions, solid colours and graphic finishes. The collection also contains size-specific HJ-45 replacement visors and clear Pinlock inserts, so it is important to distinguish a complete helmet from an accessory and to select the correct A or B visor size.

HJC F100 features at a glance

The standard F100 uses HJC's Advanced Fibreglass Composite shell, produced by laminating selected materials with rigid fibreglass. F100 Carbon models substitute a carbon-fibre outer shell. Both versions use the same rotational modular idea, but material, finish and the precise feel on the head should be compared in person rather than judged from specification alone.

HJC's ACS ventilation sends air from two intakes towards a rear exhaust. Ventilation changes with speed, screen height, head position and weather, so check that the controls are easy to operate in gloves and keep every intake and exhaust opening clear.

How the rotational design changes everyday use

Moving the chin bar towards the back of the shell produces a different open configuration from a conventional flip-front helmet. It can be useful at stops and when speaking without removing the helmet, and HJC describes the F100 as wearable in full-face and open-face forms.

Before riding with the chin bar rotated, check the approval label and the instructions supplied with the exact helmet. Open and close the mechanism several times during a fitting, confirm that it locks in the required positions and never set off with a partially engaged chin bar.

Choosing the right size and shell version

HJC's published F100 chart runs from XS to 3XL, covering head measurements from 54 to 65 cm, although Moto Central's current colourways and graphics may not offer every size. Measure around the widest part of the head just above the eyebrows and ears, then compare the result with HJC's chart and our motorcycle helmet sizing guide.

A new F100 should hold the crown and cheeks evenly. Secure the strap, then gently rotate and roll the helmet: the lining should move the skin rather than sliding freely around the head. A pronounced gap, easy movement or a concentrated pressure point can mean that the size or internal shape is unsuitable.

Glasses grooves are built into the comfort lining, but frame thickness and temple shape still affect fit. Try the helmet with the eyewear used on the motorcycle. The 3D-contoured cheek pads and crown pad are removable and washable, which helps with routine care but does not make a loose shell size correct.

HJ-45A and HJ-45B visor fitment

The F100 uses two physical HJ-45 visor sizes. HJC specifies HJ-45A for XS, S and M helmets, and HJ-45B for L, XL and 2XL. This division applies to clear, dark smoke and RST mirrored replacement outer visors.

Choose the visor variant by helmet size, not only by the F100 model name. The wrong A or B shield will not match the shell and ratchet correctly. If the helmet size label cannot be read, identify it before removing or ordering parts.

The clear Pinlock MaxVision inserts in this collection likewise have separate variants for the smaller and larger visor groups. Match the insert to the outer visor and helmet size using the listed DKS reference. A Pinlock insert fits inside a prepared outer visor; it is not a replacement visor and cannot be installed on a shield without the correct locating pins and profile.

Outer visor, sun shield and box contents

The HJ-45 outer visor is the clear weather and impact shield. HJC describes it as anti-scratch coated, Pinlock-ready and providing 99% UV protection. The HJ-V12 dark smoke sun shield sits behind it and can be adjusted for greater coverage. Raise the sun shield when light levels fall and retain a suitable clear outer visor for darkness or poor visibility.

HJC lists a Pinlock 120 XLT anti-fog insert, chin curtain and breath deflector among the standard F100 box contents. Packaging can vary by market or product version, so confirm the contents shown on the specific Moto Central product page if one item is essential.

Replacement HJ-45 visors in clear, dark smoke and mirrored RST finishes appear alongside helmets in this collection. Check their road-use markings and expected light conditions before riding. For other components, browse helmet spares and accessories.

Ventilation and interior care

The front-to-back ACS system has two intake points and one exhaust. Open vents can help move heat and moisture while riding, but an anti-fog insert and useful airflow still need to work together in cold or wet conditions. An insert addresses condensation on the inside of the outer visor, not rain or dirt on its exterior.

HJC specifies moisture-wicking interior materials and removable, washable crown and cheek pads. Follow the supplied removal sequence, clean gently with helmet-safe products and let the parts dry naturally. Avoid fuel, solvents, harsh household cleaners and direct heat around the shell, EPS, visors and mechanism.

After cleaning, make sure the cheek pads, crown pad, chin curtain and breath deflector are fully seated. Test the chin-bar travel, visor seal and micro buckle before the next ride.

Why buy an HJC F100 from Moto Central?

Moto Central brings the fibreglass-composite and carbon versions together with the available solid colours, graphics and model-specific visor parts. That makes it easier to compare helmet construction first, then choose a finish and match any HJ-45A/B replacement by size.

Our team can help assess fit with the chin bar in both positions, explain the difference between the outer visor and internal sun shield, and identify the correct visor or Pinlock variant. You can also compare other flip-front motorcycle helmets, view the wider HJC helmet range or browse all motorcycle helmets.

Customer questions