Owning a light-reactive visor and a pin-style anti-fog insert at the same time raises an obvious question: can the two work together? A photochromic visor pinlock setup is possible, but it only works when the outer visor was built with the pins the insert needs, and in plenty of cases the better answer is to change which layer does the darkening rather than stacking both.
The short answer: a pin-style insert needs two pins in the visor aperture to hold it against its seal. If your light-reactive visor has those pins, a clear insert fits it normally. If it does not, the fix is not to drill it — it is to run a photochromic insert inside a clear outer visor instead.
- Pin-style inserts mount on pins, not adhesive, so a visor with no pins cannot take one.
- Never stack a darkening outer visor with a darkening insert — the two multiply.
- A photochromic insert inside a clear visor gives you reactive tint and fog control in one layer.
- What decides road use is the approval marking on your individual visor, never the tint name.
What a photochromic visor pinlock setup actually means
Two different products get called the same thing, and the confusion causes most of the wasted orders. The first is a light-reactive outer visor with a separate clear anti-fog insert clipped inside it. The second is a single insert that is itself light-reactive, fitted inside an ordinary clear visor.
Both give you tint that responds to daylight plus a second layer that resists misting. They differ in which layer carries the photochromic dye, and that difference decides whether pins matter at all. Only the first arrangement depends on your outer visor having pins.
Pinlock is a third-party brand name, and riders use it loosely for any pin-mounted insert. We sell unbranded aftermarket Pinlock-compatible anti-fog inserts designed to fit visors prepared for that system, which is a compatibility statement and nothing more.
Does your visor have pins? How to check in thirty seconds
Take the visor off the helmet and look at the inner face at each end, roughly level with your eyes. A prepared visor has two small metal or plastic posts sitting proud of the surface, usually offset in a slot so they can be rotated to adjust tension.
If you see two smooth dimples or nothing at all, the visor is not prepared for a pin-mounted insert. Some visors ship with the pins already installed, some come with a pin kit in the box, and many aftermarket and older visors have no provision at all.
Do not drill a visor to add pins. Polycarbonate crazes around a drilled hole under vibration, the hole sits inside your field of view, and any approval marking the visor carried no longer describes the item you are wearing.
Route one: a light-reactive outer visor with a clear insert
This is the arrangement most riders picture. The outer visor darkens as ultraviolet light rises, and a clear pin-mounted insert sits behind it handling the fog. Each layer does one job, which is why it works well when the parts match.
It depends entirely on the outer visor being pin-prepared. Check before you buy the insert, not after, because the pins are a property of the visor and not of the helmet. Our guide to checking photochromic visor fitment covers how to identify what your helmet takes.
One caution: the insert must be the clear version. Pairing a darkening outer with a tinted insert is the stacking mistake covered further down.
Route two: a photochromic insert inside a clear visor
If your outer visor is in good condition and simply has no pins, this is usually the cheaper and simpler route. The insert carries the photochromic layer, so an ordinary clear replacement visor becomes light-reactive without replacing the whole shield.
The photochromic inserts we stock are the sealed-edge type rather than the pin-mounted type. You remove the visor, clean the inner face, peel the backing and press the insert on so the seal beds evenly all the way round, then refit the visor. No tools are needed.
Because it seals rather than clips, it does not care whether your visor has pins. That is the whole reason it solves this problem: it removes the dependency that route one cannot avoid.
Photochromic visor pinlock combinations compared
The table below sets out what each pairing does and where it fails. Read the last column first — it is the one that costs money when ignored.
| Outer visor | Insert | Result | Watch out for |
|---|---|---|---|
| Light-reactive | Clear, pin-mounted | Works well; tint and fog control separated | Needs pins in the outer visor |
| Light-reactive | Photochromic | Two darkening layers multiply | Too dark for dusk and night riding |
| Clear | Photochromic, sealed edge | Reactive tint plus fog control in one layer | Seal must bed evenly or it mists |
| Clear | Clear, pin-mounted | Best pure fog control, no tint | No sun protection at all |
| Fixed dark tint | Any | Daylight use only | Cannot be lightened when the sun drops |
Why stacking two darkening layers is the mistake to avoid
Light transmission through two tinted layers is not the average of the two, it is the product. Each layer passes a fraction of what reaches it, so a moderately dark outer and a moderately dark insert together pass far less light than either alone.
That is manageable at midday and genuinely dangerous at dusk. Both layers also react and recover on their own schedule, so the combination clears more slowly than a single layer as the light drops.
Pick one layer to do the darkening. If the outer visor reacts to light, run a clear insert behind it; if the insert reacts, keep the outer visor clear.
How an anti-fog insert stops mist in the first place
A pin-mounted insert works mechanically. The pins hold it under tension against a silicone bead, trapping a thin sealed air gap between insert and visor, and that gap keeps the inner surface warm enough to sit above the dew point of your breath.
A sealed-edge insert does the same job with an adhesive perimeter instead of pins. Either way the principle is trapped air, which is why a broken seal is the usual cause when an insert starts misting between the layers.
Anti-fog coatings work differently again. Published materials research on hydrophilic antifogging coatings describes condensation spreading into a continuous film rather than forming the individual droplets that scatter light, which is what you perceive as fog.
Fitting and sealing: what actually goes wrong
Most failed installations come down to the seal, not the part. Fingerprints and cleaning residue on the inner face stop an adhesive seal bedding, and on a pin-mounted insert an over-tightened pin bows the insert so the bead lifts at the centre.
Fit it with the visor off the helmet, on a clean surface, in a warm room. Handle the insert by its edges throughout, because the treated inner face marks easily and the marks sit directly in your sightline.
Our step-by-step walkthrough on fitting a pin-style anti-fog insert covers pin rotation and tension in more detail. The same care about cleanliness applies to the sealed-edge type.
UK law: the marking is the test, not the tint
The Motor Cycles (Eye Protectors) Regulations 1999 prescribe eye protectors by standard and by marking. The instrument names grades in British Standard BS 4110 and requires the protector to be marked with an approved certification mark of an approved body. BS 4110 is the visor standard; BS 6658 is a helmet standard and is a different thing entirely.
So the question is never what a tint is called. It is what is stamped on the individual visor in your hands. Iridium and mirrored finishes are never road legal in Great Britain, day or night, because they transmit too little light to be legal for road use.
We sell unbranded aftermarket parts and cannot confirm the marking on any individual item, so we do not offer any of our products as authorised for road use. Fitting a darkening insert changes how much light reaches your eyes, so check the marking on your own visor and what applies where you ride. The regulations described here are those that apply in Great Britain.
Selling eye protection as authorised for motorcycle use when it is not of a prescribed type is an offence for the seller under Road Traffic Act 1988 s.18(4), which is why we describe compatibility and never approval. The offence is non-endorsable. This is general guidance and not legal advice.
Keeping either setup working
The Highway Code expects riders to check, in its words, that the “helmet visor is clean and in good condition” before each journey, and warns that “scratched or poorly fitting eye protectors can limit your view when riding”. That advice lands hardest on a two-layer setup, where you now have four surfaces to keep clear.
Clean the outer face normally with warm water and a soft cloth. Treat the inner face of any insert as delicate: warm water only, no solvents, no household glass cleaner, and blot rather than rub. Read the Highway Code rules for motorcyclists if you want the full wording.
Not sure which combination your helmet takes? Our visor finder matches your model to the parts that fit it, and the photochromic visor range shows which fitments are available as a reactive layer.
Frequently asked questions
Can I fit a pin-style insert to any photochromic visor?
Only if that visor has the two pins the insert locates on. Pins are a property of the individual visor, not of the helmet model, so check the visor itself before ordering an insert.
Can I use a tinted insert behind a photochromic visor?
You can physically fit one, but you should not. The two darkening layers multiply rather than average, leaving you with far less light than either layer alone as soon as the sun drops.
Does a photochromic insert darken as well as a photochromic visor?
It behaves the same way, reacting to ultraviolet light and clearing again as light falls. It sits behind the outer visor, so the outer layer’s own material affects how much ultraviolet reaches it.
Will an anti-fog insert still work if my visor is scratched?
The insert seals against the visor surface, so a scratch crossing the seal line lets air leak and mist will form between the layers. Scratches inside the sealed area do not affect fog control but still sit in your view.
Is a photochromic visor road legal in the UK?
What decides it is the approval marking on the individual visor, not whether the tint is fixed or reactive. Check for a BS 4110 grade with an approved certification mark, and remember that a marking on one item says nothing about another.