At 7.94 ounces (225 grams) in a size medium, the Aeon is the lightest road bike helmet in our test. The Aeon's super light weight not only saves energy on the road, but also means it is more comfortable on the head.

But the lightest bicycle helmet of all here is this BBB Tithon at just 100g, which has been wind tunnel-tested to find the best balance between aerodynamics and thermodynamics, making it as safe as possible and optimising the airflow in the process.

The Kask Valegro is by far the lightest road bike helmet I could find, and the only one diving below 200 grams (for a size small that is).

Limar’s Ultralight road helmet has long fought for the title of “world’s lightest bike helmet”, with us having weighed various iterations from just 159g to 173g on our own scales. But now the Ultralight+ gets tweaked, keeping the same overall shape with its distinct spoiler fin, but rethinking its multi-part in-mold construction.