At the budget end of the modular market, these two make different arguments. The HJC i91 is the comfortable, well-finished commuter; the Scorpion EXO-GT930 Transformer is the clever 3-in-1 that converts to a true open-face. Both are honest cheap flip-ups with sun visors — the decision is comfort versus versatility.
Certification: both budget, both with caveats
Neither carries the full genuine ECE 22.06 P/J story of a mid-tier lid. The US i91 is marketed DOT-approved; HJC's European i91 exists in both 22.05 and 22.06, so we don't assert current 22.06 on the US unit. The GT930 is DOT + ECE 22.05 P/J — a confirmed but older standard without the rotational test 22.06 adds (a few listings claim 22.06 — treat that as unverified). So both are honest budget helmets with certification caveats; if you want confirmed current 22.06, step up to the HJC RPHA 91 or LS2 Advant X.
Comfort and finish: the i91's edge
The i91's reason to exist is comfort per dollar. Its interior is soft and easy to live with, it comes in multiple shell sizes, and the fit and finish feel a notch above the GT930's. For a rider who just wants a comfortable, well-made daily flip-up from a major brand, the i91 is the more pleasant helmet to wear.
Versatility: the GT930's edge
The GT930 answers with its party trick: the chin bar removes so it converts into a genuine open-facehelmet, not just a flip-up, with P/J homologation making that open mode approved. For a rider who wants a full-face for cold mornings and an open helmet for hot afternoons, that's a genuinely useful feature the i91 can't match. Both have drop-down sun visors.
Weight and everyday use
Both are polycarbonate and heavy — the i91 around 1,720 g, the GT930 around 1,890 g — so neither is light, and earplugs are sensible in both at highway speed. Both take comms and have Pinlock-ready or sun-visor provisions. The i91 is the lighter and more comfortable; the GT930 the heavier but more configurable.
The verdict
Want the more comfortable, better-finished daily commuter, and DOT satisfies you? The HJC i91. Want the convert-to-open-face trick for hot-weather versatility, and the ECE 22.05 certification doesn't bother you? The Scorpion EXO-GT930. Both anchor our budget modular roundup — read the i91 review and GT930 review.
How we picked
We compiled published specifications, cited each helmet's certification (DOT, ECE 22.06, Snell, SHARP) from the standards body or manufacturer homologation, and aggregated owner reports, then scored against a published method. The scores are judgments from documented research — not measurements we took. We do not run a crash lab. Certifications reflect the US-market build; where it differs from the European version, we say so and cite it.
