Giro Eclipse Spherical helmet review - 'I hit my fastest ever speed of 86kph with this lid'

Anecdotally, we can agree with Giro's claim of this being the fastest and most aero helmet on the market, but it was the ventilation that impressed us the most

Giro Eclipse Spherical helmet
(Image credit: Future)
Cycling Weekly Verdict

Claims can often be exaggerated for marketing purposes, but there is no questioning that this aero helmet facilitates unobstructed airflow. Its cost is probably out-of-reach for most, but for the price you also get outstanding ventilation

Reasons to buy
  • +

    Very aero

  • +

    Mips system included

  • +

    Great ventilation

  • +

    Comfortable

Reasons to avoid
  • -

    Very expensive

  • -

    Is it really stylish?

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

In the absence of a wind tunnel and a specialist support network around me to break down my riding data, it’s impossible to verify Giro’s claim that the Eclipse Spherical is the fastest ever aero helmet.

But, anecdotally, what I can say with confidence - and delight - is that over the 2,500km of riding that I had the helmet on test, my average speed descending markedly improved and I reached my fastest ever speed (86kph, which is not bad for a 62kg beanpole on a lower end bike). What’s more, on flatter roads and in a more ‘normal’ position, my average speed consistently increased.

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Chris Marshall-Bell

A freelance sports journalist and podcaster, you'll mostly find Chris's byline attached to news scoops, profile interviews and feature writing across a variety of different publications. He has been writing regularly for Cycling Weekly since 2013.

Previously a ski, hiking and cycling guide in a number of places, but mostly in the Canadian Rockies and Spanish Pyrenees, he almost certainly holds the record for the most number of interviews conducted from snowy mountains.

He lives in Valencia, Spain.