Rohan Dennis wore one last July while blazing the fastest Tour de France prologue in history, and later this year two models of the Giro Aerohead MIPS time trial helmet will be available to the public. The $550 Aerohead Ultimate MIPS and $250 Aerohead MIPS are quite similar in design, with the former prioritizing aerodynamics and the latter featuring more ventilation.
Both Aerohead models are faster than anything Giro has produced, the company says, including the Selector, which Giro had long claimed to be the fastest commercially available time trial lid.
After developing the shape through various iterations via CFD, wind tunnels and rider testing, Giro settled on a shape that features an extended brow and a massive, wraparound Zeiss optics shield that attaches with magnets. While many TT helmets are somewhat difficult to get in and out of, the Aerohead goes on like a normal helmet, then then shield snaps in place and encloses the upper portion of the face and the ears — a key part of the aero design.
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Giro tested the Aerohead against a number of other helmets in various wind tunnels and on the Los Angeles indoor velodrome, where the controlled environment allowed for real-world power-savings testing.
Giro used its old Advantage TT helmet as a baseline, which it measured at 1,709g of drag. The Air Attack Shield produced 1,699g, the Selector 1,693g and the Aerohead MIPS 1,685g and the Aerohead Ultimate MIPS 1,682g.
In the track testing, Giro claims, the Ultimate was 17 watts faster than the Advantage.
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