For most new riders, buy the LS2 Stream II. Buy the Bell Qualifier DLX if MIPS and a shield that tints itself are the features you want most. The Stream II carries DOT and ECE 22.06 where the Bell listing we verified states DOT only, and it adds a drop-down sun visor and a Pinlock-ready shield that the Bell does not have, at 69 g less published weight and usually less money. That is three advantages that affect every ride against two features that are genuinely good and more specialised.
This is one of the few comparisons on this site where the cheaper helmet is also the better-certified one, so it is worth being clear about what the Bell is actually offering: a rotational-impact mechanism(MIPS) and a shield that handles changing light by itself. Neither of those is marketing filler. They just do not add up to the Stream II’s combination unless one of them is specifically what you came for.
What both makers publish
| | Bell Qualifier DLX MIPS | LS2 Stream II |
|---|
| Certification | DOT FMVSS 218 (only certification listed on the page we verified) | DOT FMVSS 218, ECE 22.06 |
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| Rotational-impact approach | MIPS low-friction liner layer | AREM rotational-energy management, plus 22.06 oblique-impact testing |
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| Published weight | 1,619 g (3.57 lb, RevZilla; size not stated) | 1,550 g ± 50 g (LS2 USA; size not stated) |
|---|
| Shell | Polycarbonate | Kinetic Polymer Alloy (KPA) |
|---|
| Internal sun visor | No — ProTint photochromic shield instead | Yes, drop-down |
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| Pinlock-ready shield | No | Yes |
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| Stated interior shape | Intermediate oval | Intermediate oval |
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| Sizes | XS–3XL | XS–3XL |
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| Our spec score | 7.9 | 8.2 |
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The real argument: a feature or a test result
Both of these helmets are trying to address the same thing — rotational forces, the twisting acceleration that a straight-line drop test does not measure — and they do it in categorically different ways. Understanding which you are buying is the whole decision.
The Bell gives you a mechanism.MIPS is a low-friction layer between the head and the liner that permits a small amount of relative movement during an angled impact, with the intent of shedding rotational energy before it reaches the brain. It is a real engineering approach with published research behind it, and it is unusual to find at this price. What it is not is a certification: the Bell page we verified lists no standard beyond DOT, so there is no published test result showing what the helmet’s rotational performance measures. Our MIPS guide sets out both the evidence and the limits.
The LS2 gives you a test result.ECE 22.06 is the current UN standard, and among the things it added over 22.05 is an oblique-impact test that measures rotational acceleration. A 22.06 approval means the helmet, as sold, cleared that test — using whatever construction the maker chose, which LS2 calls AREM. Finding a 22.06 approval on a helmet in this price bracket is the single most surprising thing in this comparison; it is a standard usually associated with far more expensive lids.
If you want a named technology, the Bell has one. If you want evidence that the helmet passed a rotational test, the LS2 has that. We weight the published result higher, which is why the Stream II scores 8.2 against the Bell’s 7.9 on our spec rubric.
Fog and sun: the two things you notice every ride
Fogging is where the Bell has a genuine weakness for a first helmet. The Stream II’s shield is Pinlock-ready, so a Pinlock insert fits and the fogging problem is simply solved. The Qualifier DLX’s shield is not Pinlock-ready on the listing we verified, which leaves vents, a breath deflector and anti-fog sprays. New riders ride in whatever weather the day gives them, often at low speed in traffic where airflow is worst, and a fogged visor is the one failure that stops you seeing. Our guide on how to stop a helmet fogging covers the workarounds, and they are workarounds.
Sun is where the Bell has a genuinely clever answer.Its ProTint photochromic shield darkens in sunlight and clears again at night, with nothing to flick and no shield to carry. The LS2 instead fits a conventional drop-down sun shield, which is instant, mechanical, and under your control — you can clear it the moment you ride into a tunnel. Photochromic shields react on a delay, and the Bell’s tint is always in the line of sight because it is the shield itself, where the LS2’s visor retracts fully out of the way. Both approaches work. The lever is more predictable; the photochromic is less to think about.
Weight, shell and fit
The LS2 is published at 1,550 g with a stated tolerance of 50 g; RevZilla lists the Bell at 1,619 g. That puts the Stream II roughly 69 g lighter, which is a real but modest difference — and LS2’s own tolerance means a given helmet could land anywhere in a 100 g band. Neither figure states the size it refers to. Both helmets are heavier than the composite lids in our lightweight ranking, which is the normal trade for a budget shell.
On fit, the two are remarkably similar on paper: both intermediate oval, both XS–3XL. That size range is worth noting in itself, because it means riders with genuinely small or genuinely large heads are catered for at budget money, where plenty of premium helmets stop at 2XL. But “intermediate oval” is each company’s own description of its own interior rather than a shared measurement, so the two can feel very different on the same head. Try both.
The third helmet to know about
If you are shopping this price bracket, there is one more helmet that should be on the list: the Scorpion EXO-R430. It carries Snell M2025— a current Snell rating, in the budget tier, which is rare — on top of DOT, and it runs XS to 4XL, the widest size range of the three. What it gives up is everything the other two are competing on: no sun visor, no Pinlock-ready shield (Scorpion uses its own EverClear anti-fog instead), and no ECE approval stated.
So the budget full-face choice resolves into three honest answers. LS2 Stream IIif you want the newest certification plus the everyday conveniences — our default recommendation, and the pick we rank in the budget ranking. Bell Qualifier DLX if MIPS and a self-tinting shield are what you specifically want. Scorpion EXO-R430 if a current Snell rating matters more to you than features, and whether it should is worth reading before you decide. All three are cards below with live prices.
One last thing, and it is the part that matters more than any spec on this page: whichever you buy, buy it in the size that fits and spend what is left on gloves. Hands hit the ground in almost every fall, and a new rider in a certified helmet with bare hands has the wrong allocation. Our spending guide puts the whole head-to-toe budget in order.