Back in the days when there was no such thing as a bike helmet, all us kids rode bicycles like they were extensions of our body. Sometimes we would hit a rut and go over the handle bars. Never did I hear of any kid hitting their head. Like cats we always learned how to land on our feet. If we wore a helmet, we would have been less nimble.
A helmet hinders the rider’s head to move in fast action to look at ones surroundings for trouble. A helmet can cause ones head to overheat which can affect mental alertness. The sound of the wind hissing through the helmet holes also interferes with hearing.
Helmets are just a sneaky way to limit the number of kids riding bicycles. A kid on a bicycle makes the motorist too nervous. Put helmets on the kids and you take the kids off the bicycles.
Utter nonsense. My heaviest bike helmet weighs in under 300 grams. If you think it makes me any less nimble you're invited to follow me down Barr Trail next time I'm in Colorado.