The helmets on test were worn for at least 200km each, as well as being subject to aerodynamic testing using a Notio aero unit to measure the CdA changes vs a baseline road helmet.

Finally, the last item we wanted to cover (and which we typically get the most questions about) was whether it made us faster. And unfortunately, we can’t answer for sure without heading to a wind tunnel for consistent and repeatable tests. Add to that the fact that different rider’s positions require different helmets, and we just refuse to speculate. What we will say that if the Aerohead works for your position, you won’t go wrong with this helmet. Wrapping Up

Customer reviews

Cycle Centre Congleton Limited 2021. Cyclestore is a trading name of Cycle Centre Congleton Limited. All Rights Reserved Company No. 05107467 | VAT No: 593 733 507 Giro helmets are developed utilizing our proprietary Wind Tunnel ventilation system. This elaborate design combines

We’ve been wanting to incorporate carbon fiber into a helmet for years now,” said Giro marketing director Dain Zaffke. POC's Cerebel is a huge departure from the company's first go at a time-trial helmet, the Tempor. Not only is it much smaller, it's also derived from an entirely different design philosophy. The aero tests were specific to our test pilot's, Gabe Dellar, position and this is worth remembering - these results won't necessarily be the same for all riders. In addition to a vent at the front of the helmet, on top is a hatch that Lazer calls the Aquaport. It’s designed to allow a rider to pour water over their head during extended efforts in high temperatures. While the feature adds weight to the helmet, if you run hot, it's probably worth its weight in gold. POC’s Cerebel is a huge departure from the company’s first go at a time-trial helmet, the Tempor. Not only is it much smaller, it’s also derived from an entirely different design philosophy. The Cerebel is meant to be fast in a wide variety of positions for a wide spectrum of riders. Again, I can’t confirm these claims, but with its rounded, bobtail shape, it’s easy to understand them.The POC might be wonderfully small, but it’s still comfortable with the shell standing off the ears nicely. Adjusting the rear dial mechanism is best done with the helmet off, but those with smaller hands may be able to reach inside the soft tail section to do so on the fly.The two-piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner The Giant is fairly tight over the ears, likely a good thing in terms of aerodynamics, but can be a bit uncomfortable on longer rides. Personally, the Rivet TT would be great for short, hot time-trials or triathlon. The ventilated visor and the gills at the side do a good job of moving air through the helmet. That said, depending on the tilt of your head, it's easy to experience noise. When I dropped my head, looking down, it would whistle at me. While annoying at first, it came as a handy reminder to keep my head up, looking forward. By using a polycarbonate shell, Wind Tunnel ventilation and internal channeling, this helmet is proven to boost Choosing the best time trial helmet for you will be determined primarily by your head positions and how long you're capable of 'turtling' over the course of an event. For those who are incredibly disciplined and their head stays perfectly still for the entirety of the TT, a helmet with a slightly longer tail should create less wind resistance — 'should' being the key word, as there is a myriad of other variables in a TT position that can affect drag.