Leatt Gravity 5.0 for eMTB: BOA FS2, sizing and full-face helmet checks

A full-face helmet worth considering beyond its weight

Pedalling uphill with assistance does not eliminate heat or make every full-face helmet comfortable. On an enduro eMTB, you alternate effort, speed, stops and descents; the helmet must work throughout that day. The Leatt Gravity 5.0 is interesting for combining a chin bar, BOA FS2 adjustment and an intended use the brand places in enduro and bike parks.

The choice is not simply full-face versus open-face. First establish where you ride, what the venue you visit requires and which equipment you can wear correctly fitted. Weight, ventilation, eyewear and budget come afterwards. Buying a feature list without checking size reverses the process.

This is an original guide based on documentation from Leatt Europe, BOA and the official manual, checked on 20 October 2026. It is not our own test: we have not measured temperature inside the helmet, trail comfort or impact behaviour. Nor do we present an already documented and catalogued model as a launch happening today.

What BOA FS2 adds and what still depends on you

BOA describes the FS2 as a micro-adjustable fit system with a Dynamic360 wrap. It uses laces to distribute tension around the head. That is the technical proposition, not our measurement of how much better it fits each person.

When buying, something simpler matters more than the trade name: can you loosen it, put the helmet on and readjust it without struggling with straps or padding? Ask for a demonstration, then repeat the process yourself. A quick retailer explanation does not tell you whether it will be convenient every time you ride.

Do not start by tightening it fully. The aim is to find the intended fit in the correct size, not compensate for looseness with extra tension. If the system must be at one extreme for the helmet to feel stable, reassess size and shape before assuming you need to get used to it.

Also test access with your usual gloves. Finding the dial in a shop and doing so during a cold or muddy stop are different situations. This check does not require a fast descent or a difficult manoeuvre: much of the decision can be made in a calm setting.

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Three sizes, but your head is more than a circumference

The Leatt Size Guide lists S for 51–55 cm, M for 55–59 and L for 59–63. These are reference ranges; falling within one does not establish that the internal shape fits you. At a boundary, do not automatically choose the larger or smaller number.

Bring a carefully taken measurement and compare how the helmet sits. Do not assume your cap size or another brand's size is an exact equivalent. People with the same circumference may need different internal shapes; the table is only a starting point.

Keep it on for a while and pay attention to localised pressure, movement when talking and ease of fitting your eyewear. Do not confuse a secure feel with pain you must tolerate. If something does not fit, try another size or model before committing to buy.

Padding and closure: two checks I would not delegate

Leatt lists two-position cheek pads and a magnetic Fidlock closure. These are separate from the rear dial. Fit is therefore not just a matter of turning a wheel: pad placement and the closure are also part of the complete setup you will use.

Ask to see how everything fits on the helmet you are buying and which padding options actually come in the box. Do not assume a spare shown in a photograph is supplied with every version. Resolve this beforehand, especially when buying remotely without comparing several examples.

Check that the pads stay securely attached when putting the helmet on and taking it off. If a fixing comes loose or a part moves abnormally, do not improvise with glue: consult the retailer or Leatt support. An online spec sheet cannot replace inspecting the actual helmet.

Practise opening and closing it with gloves, then check that the mechanism is properly secured. A magnetic closure does not mean you can forget to check it. For equipment used frequently, ease of repeating this routine matters more than how impressive the first attempt seems.

Try your eyewear before leaving the shop

The front opening and visor affect how the helmet works with your eyewear. We have not verified compatibility with every goggle or glasses frame. Bringing your existing eyewear helps avoid buying two products that seem suitable separately but do not fit well together.

Check the goggles' position, contact with your face and access to the strap. Look up and down with normal movements, without forcing anything. The aim is to identify uncomfortable contact or shifting parts, not recreate a crash or make the fitting test risky.

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Think about your usual stops. If you remove your eyewear to drink, talk or check a route, establish where you will put it without obstructing the adjustment system. An accessory that works only in one precise position may prove less convenient than expected on a long ride.

If you wear prescription glasses, testing the combination is even more important. Do not buy assuming the arms will adapt later or extra pressure will resolve a poor fit. The comfort you need must come from a stable combination you can use according to its instructions.

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A claimed 710 grams is not a comfort test

Leatt claims 710 g in size M. That is the manufacturer's figure for that size, not a verified weight for every helmet or configuration. Compare helmets in equivalent sizes with equivalent accessories; a visor extension or other parts can change the comparison.

Weight matters, but it does not alone describe how a helmet feels. Position, internal contact, eyewear compatibility and time spent wearing it matter too. We have not compared this Gravity with your alternatives on a ride, and cannot promise greater comfort from a difference of a few grams.

The UK technical data sheet describes a two-piece construction using polymer and thermoplastic carbon in different areas, plus a polymer chin bar. Avoid describing it as an entirely carbon helmet: the manufacturer's own breakdown is more specific.

Separate what you can check in a shop from what remains untested. You can assess size, visibility and operation; how hot it feels after a long climb requires a different experience. An analysis based on documentation must acknowledge that distinction, not fill it with advertising adjectives.

Ventilation and rain: what you can check without inventing a test

According to Leatt, the Gravity 5.0 includes a removable vent cover around the mouth and a semi-transparent visor extension for bad weather. Do not confuse that cover with a removable chin bar: this is a full-face helmet, not one that converts to open-face.

Openings do not tell you how hot you will feel on a climb at your pace, in your humidity and equipment. Nor do they prove that one helmet ventilates better than another. We have no thermal measurements of our own here, so we do not rank cooling from photographs.

Ask to see the accessories and their intended fitting. Consider whether the rain accessory suits your routine: where you would carry it and when you would use it. You do not need every accessory on every ride simply because it is included.

On an eMTB, assistance can make repeated climbs easier, but you are still pedalling and generating heat. Plan stops and clothing for the conditions without treating the helmet as a universal solution to heat. It must suit your whole ride, not just the minutes spent descending.

Certifications and Turbine EVO: claims to keep in perspective

The European product pages checked list EN 1078, CPSC 1203 and ASTM F1952–15. We report what Leatt publishes without turning the list into a comparison of test results between helmets. Check the actual helmet's label and documentation, especially if it comes from another market.

The brand calls its internal impact-management technology 360° Turbine EVO. We publish no protection percentages or claims that it eliminates injuries. A technology name or certification cannot tell us what will happen in a specific crash.

Before visiting a bike park or event, also check its entry and equipment requirements. Do not assume a venue accepts any helmet with a chin bar or any model a shop calls enduro. Confirming the requirement with the organiser avoids buying on a mistaken interpretation.

The decision does not end with the helmet. Line choice, speed, terrain conditions and the rest of your equipment still matter. Our guide to eMTB protective gear helps organise your purchase, but does not replace manufacturer instructions or suitable training for your intended use.

After use: cleaning, inspection and the right spare parts

The official manual, with section in Spanish, specifies cleaning with a cloth, cold water and mild soap or detergent; pads can be hand-washed and air-dried. It also warns of substances that can cause invisible damage. Do not use a workshop product simply because it cleans your bike frame well.

The manual prohibits modifying the helmet and requires manufacturer inspection or replacement after a severe impact; if there is damage, it says to replace it. Do not assume it remains fit for use simply because the shell looks good. If unsure about your helmet, consult the appropriate service team before using it again.

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Arrange somewhere the helmet can dry and be stored without being crushed between tools or other objects. Keep the product reference, documentation and proof of purchase: these help identify replacement pads or parts. Not every accessory from the same brand is interchangeable.

Before buying fit-system spares, identify the exact system. BOA's page provides access to support; this does not make every helmet repair a home job. A dial fault and structural damage are different problems requiring appropriate responses.

European price and our pre-purchase checklist

The official Italian store showed €359.99 including VAT when checked. This is a price reference for that market, not a confirmed final Spanish price or an offer guaranteeing availability in every size. Check the seller, shipping, trial conditions and box contents before deciding.

Our shortlist would contain five questions: does the size fit without extreme tightening; is BOA easy to operate; do your eyewear and gloves work with the setup; are all accessories present; and who handles a fault? An attractive photograph alone answers none of them.

I would consider the Gravity 5.0 for someone seeking a full-face helmet with fine adjustment who can try it on properly. I would not recommend it blindly for its claimed weight or to replace an already well-fitting helmet without an identifiable improvement. The choice is personal and requires checks on a real helmet.

The conclusion is simple: use technical information to prepare a good fitting test, not avoid it. You can invest heavily in an eMTB's motor and battery; taking time over a helmet you will wear throughout the ride is at least as important.