Specialised Propero 4 Helmet is Completely Redesigned for Aero Velocity + Air flow

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Specialised has a brand new model of the Propero, however in case you’re acquainted with the earlier variations, you may not even acknowledge it. Because of borrowed design language from the S-Works Evade 3 and Prevail 3, the brand new Propero 4 appears like a wholly totally different product – which is an effective factor.

Notably, the Propero 4 brings a lot of the efficiency of the upper finish S-Works fashions to a extra attainable value level. The $200 Propero 4 isn’t precisely low cost, nevertheless it checks in at 2/3rds the price of the premium fashions.

When it got here time to design the brand new helmet, Specialised says they began with aerodynamics first. Beginning with a battery of CFD assessments and a number of helmet shapes, Specialised narrowed it down to 2 shapes after which took these to their in-house Win Tunnel. This wind tunnel testing with a male street race model validated the Propero 4 as being 4 watts sooner than the S-Works Prevail 3. That works out to it being 15 seconds sooner over 40km with a median pace of 45kph. Specialised doesn’t state the way it compares to the Evade 3 so we’re assuming the Evade 3 continues to be sooner.

To enhance air flow, Specialised once more utilized CFD to handle airflow round and thru the helmet. As well as, they declare to have created a brand new method of accelerating air move that they’re calling Micro Channeling. This includes 2mm offset micro channels which are mentioned to create turbulence within the airflow by way of the helmet to “create a steady, refreshing move of air.” Mixed with massive rear vents, the helmet manages to maneuver a variety of air round and thru it.


On prime of being aerodynamic and well-ventilated, the Propero 4 places a deal with security with MIPS Evolve. The slip airplane is connected to versatile anchors which gives the 10-15mm of motion to cut back rotational forces transmitted to the mind throughout a crash. Exterior of MIPS, the helmet additionally scored the very best 5-Star helmet ranking from Virginia Polytechnic Institute and State College.

I’m completely satisfied to see that whereas Specialised went with mild weight internet splitters, their Tri-Repair splitter nonetheless permits adjustment fore and aft.

Precise Weight

On the dimensions, our medium pattern weighs in at 308g.

First Impressions

Relating to new street helmets, I haven’t had nice luck lately – till now. I actually needed to love the Prevail 3, however the revised form of the helmet digs into the again of my head. Then, on the Lazer Z1 Kineticore, the non-adjustable webbing straps meant the chinstrap was poorly positioned on my head.

Fortuitously, the Propero 4 matches me practically completely in all elements. It’s extraordinarily comfy, and proper out the field the Tri-Repair splitters had been in the proper place, although they’re adjustable.

Despite being an aero helmet, the Propero 4 does an excellent job of constructing it appear to be you’re not sporting an aero helmet. For my part, it’s an aero helmet you could put on each day with out feeling such as you appear to be a dork out to set some PRs on the bike path. That’s to not say it’s not aerodynamic although. On a very windy experience the place every part was getting buffeted by the wind, I felt like my head was uniquely steady – in a method that you could possibly really feel.

Extra importantly to me, it’s extremely effectively ventilated. Whereas using, you’ll be able to really really feel the airflow coming by way of the again of the helmet onto your neck. I haven’t tried it on an excellent sizzling day but, however first impressions make me assume that it could nonetheless be very comfy.

Pricing & Availability

Specialized Propero 4 bike helmet colors

Provided in 5 colours, the Propero 4 is priced at $200 and is on the market now. Helmets will likely be provided in S, M, and L sizes in each a “basic” and “spherical” match.


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