Specialized Propero 4 Helmet is Totally Redesigned for Aero Speed + Ventilation

Click to email a link to a friend Specialized has a new version of the Propero, but if you’re familiar with the previous versions, you might not even recognize it. Thanks to borrowed design language from the S-Works Evade 3 and Prevail 3, the new Propero 4 looks like an entirely different product – which is a good thing.

When it came time to design the new helmet, Specialized says they started with aerodynamics first. Starting with a battery of CFD tests and multiple helmet shapes, Specialized narrowed it down to two shapes and then took those to their in-house Win Tunnel. This wind tunnel testing with a male road race mannequin validated the Propero 4 as being 4 watts faster than the S-Works Prevail 3. That works out to it being 15 seconds faster over 40km with an average speed of 45kph.

I’m happy to see that while Specialized went with light weight web splitters, their Tri-Fix splitter still allows adjustment fore and aft.When it comes to new road helmets, I haven’t had great luck recently – until now. I really wanted to like the Prevail 3, but the revised shape of the helmet digs into the back of my head. Then, on theFortunately, the Propero 4 fits me nearly perfectly in all aspects.

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