If you ride long days with an intercom in your ear, buy the Schuberth C5. If you want a composite modular with a sun visor and will not use most of what the C5 charges for, buy the HJC RPHA 91 and spend the difference on gear. That is the whole decision. These two are not close on the spec sheet — the C5 leads on homologation, anti-fog, comms integration and size coverage — but the RPHA 91 costs so much less that the question is not which helmet is better. It is whether you will use the things the C5 is better at.
One figure cuts the other way, and it matters more than it looks: the RPHA 91 is the lighter helmet on the published reference weights, by 48 g. If you have a large head, that gap widens considerably, because Schuberth’s own weights climb with shell size and HJC’s single figure does not move.
What each maker publishes
Every figure below was read from the page named on that helmet’s card at the bottom of this page, on the date recorded there. Where a maker does not publish a figure, this table says so.
| | Schuberth C5 | HJC RPHA 91 |
|---|
| Certification (US pages) | DOT FMVSS 218, stated P/J | DOT FMVSS 218 |
|---|
| ECE 22.06 / Snell stated? | No / No | No / No |
|---|
| Published weight | 1,790 g in 55/57/59; 1,780 g in 51/53; 1,900–1,910 g from 61 up | 1,742 g (3.84 lb, RevZilla; reference size not stated) |
|---|
| Shell | DFP fiberglass reinforced with basalt | P.I.M. EVO (carbon, carbon-glass and linen fiber) |
|---|
| Shells / size coverage | Two shells covering eight head sizes, 51–65 cm (XXS–3XL) | XS–2XL; shell count not stated on the page we read |
|---|
| Anti-fog | Pinlock 120 preinstalled on a class 1 visor | Pinlock-ready; insert sold separately |
|---|
| Internal sun visor | Yes (V-lock) | Yes |
|---|
| Comms | Speakers plus Mesh, FM and Bluetooth antennas built into the shell (SC2 / SC EDGE) | Designed for SMART HJC 21B / 50B |
|---|
| Published noise figure | 85 dB(A) at 62 mph, naked bike (Schuberth’s own wind tunnel) | Not published |
|---|
| Retention | A.R.O.S. anti-roll-off geometry; exchangeable chin-intake filter | Not published as a named system |
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| Our spec score | 8.9 | 8.5 |
|---|
The one spec that is genuinely rare
Schuberth states P/J homologation for the C5. HJC states no such marking for the RPHA 91. On a modular helmet this is the line to read first. A P marking is a protective chin bar; a J marking is an open-face approval; a helmet marked P/J has been approved in both configurations, which is the manufacturer saying you may legitimately ride with the chin bar raised. Most flip-ups are approved closed only, and raising the bar on those is a stationary convenience, not a riding mode.
Schuberth publishes this claim on its own US data sheet for the DOT version, which is the most authoritative place it could appear. We take the maker at its word and name the document. HJC publishes no equivalent marking, so the honest reading is that the RPHA 91 is a closed-position helmet with a hinge for traffic lights and fuel stops. If riding chin-bar-up on a hot day is something you actually do, that is a real functional difference and not a spec-sheet curiosity. Our guide to whether modular helmets are as safe as full-face covers what the markings mean in full.
Weight, and the trap in comparing it
At first glance the HJC wins: 1,742 g against 1,790 g, a 48 g advantage. But the two figures are not the same kind of number. Schuberth publishes a weight per shell size— 1,780 g in the smallest sizes, 1,790 g in the middle, and 1,900 to 1,910 g from size 61 up — while RevZilla’s HJC listing gives one figure and does not state the size it refers to.
So a medium-headed rider is choosing between two helmets about 50 g apart, which is not a reason to pick either. A rider in a 61 cm head is choosing between roughly 1,900 g of Schuberth and an HJC figure that may or may not scale, and at that point the honest advice is to weigh the actual helmet in your size rather than trust either page. Both of these are heavy helmets by full-face standards; a flip-up carries a hinge, a second shield and a sun visor mechanism, and that mass has to go somewhere. If low weight is the priority, a modular is the wrong category — our lightweight ranking is built on published figures across the whole registry.
Where the money actually goes
Anti-fog.The C5 arrives with a Pinlock 120 already on a distortion-free class 1 visor. The RPHA 91 is Pinlock-ready and the insert is a separate purchase. For a touring helmet that will see cold mornings and wet evenings, add an insert to the HJC’s price before you compare the two.
Comms.This is the biggest single gap. Schuberth lays the speakers and three separate antennas — Mesh, FM radio and Bluetooth — into the C5’s shell for its SC2 and SC EDGE modules. Nothing clamps to the outside, and the antennas are longer than anything a bolt-on unit can carry. HJC designs the RPHA 91 around its own SMART HJC 21B and 50B units, which is a tidy install but a narrower ecosystem with fewer units and less third-party support. Both are brand-locked and both modules cost extra. If you already own a Cardo or a Sena you intend to keep, neither helmet is playing to its strength, and our intercom ranking is the place to start instead.
Size coverage.Schuberth covers 51 to 65 cm — eight head sizes, from XXS to 3XL — across two shells. That is unusually wide, and it is the reason the C5 keeps appearing in conversations about genuinely small and genuinely large heads. HJC runs XS to 2XL. If you are at either extreme, that is a shortlist decision made for you, and our big-head ranking goes through the options.
Noise engineering.The C5 is the only helmet in our entire registry whose maker publishes a noise figure: 85 dB(A) at 62 mph on a naked bike, from Schuberth’s own wind tunnel. That is not a number you can compare with the RPHA 91, because HJC publishes nothing. What it tells you is that one of these two companies treats wind noise as a measured engineering target. Treat the figure as design intent, not as a cross-brand measurement — our quiet-helmet page explains exactly how little the industry publishes here.
And the third helmet on most shortlists
Neither of these is the only flagship-modular answer. The Shoei Neotec 3 publishes DOT and ECE 22.06 in an AIM composite shell at 1,700 g per Shoei Europe, with the larger QSV-2 sun visor and a CNS-3C Pinlock-ready shield with a defogger. It is the only helmet mentioned on this page with published 22.06 rotational-impact testing, and it scores highest of the three on our rubric. It does not publish a P/J marking and its comms are Shoei-specific. We have put a card for it below, and the Neotec 3 against the C5 is its own comparison if that is the pair you are really weighing.
The short version: the C5 is the better touring helmet and the RPHA 91 is the better buy. Decide which of those sentences describes your riding, and the choice makes itself.