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this post was submitted on 25 Jan 2026
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That was sadly exactly what I was expecting from the electric motorization of bicycles. It is a history that has repeated itself many times in the last 70 or 80 years since the first combustion engine mopeds.
The fact is that the human-powered bike is at a sweet spot of efficiency and safety. Once you go faster, you need a helmet, a heavier frame, wider tyres, better brakes, wider lanes, protective clothing, protection against cold, a heavier motor for propelling all the extra weight, and so on. The energy input from you the human dwindles.
It is not any more a bicycle.
You need a helmet on purely muscle-powered bicycles, too. A helmet saved both mine and my father's life in accidents that would not had happened were we not riding bikes that moment.
A majority of bicycle accident fatalities could have been prevented with helmets.
Wear helmets. There are cool models, too, don't try that excuse.
Oh man I got a concussion while wearing a bike helmet I probably would have died if I wasnt wearing it. And we were just kids makings jumps in the driveway...
Yes, right.
But: A bike helmet won't help you much if you have a collision at 50 km/h. If you go at moped / light motorcycle speed, you need a motorcycle helmet, too.
Yeah, obviously you need different helmets for different speeds. But the comment I responded to was worded like you wouldn't need a helmet on bicycles at all.
In principle, this is correct. But the need for a helmet increases massively with speed.
Consider the end speed of free fall when falling a certain height - or the inverse, height in meters versus speed in kilometer per hour. It is:
Would you jump from ten meters height into a concrete surface? Few people would, because it is almost certain that you die. But the frame pillar of a car is equally hard as such a surface.
Another data point: In the center of Copenhagen, not so many people use a helmet, but the speed is typically between 10 and 15 km/h - so many bikes there ! - and the number of serious accidents is very low. The contrary is the case for Germany.
And just to make a point: Using a helmet is always safer.
So? Nobody is arguing about this but you. Again, my point is not about speeds or certain types of helmets. I just said you should wear a helmrt on bikes FFS!
I think the point is that the convenience of being able to ride a bike without having a helmet at hand is something beneficial for the group. That it, there would be fewer cyclists if wearing a helmet was mandatory, and that would harm cyclists as a group.
By all means, if you consistently go over 20km/h on bike, wear a helmet, as at that speed it's starting to get dangerous.
people probably said the same about seat belts once upon a time
helmets should be mandatory, just like seat belts
(and they are in australia)
Here is the python code I used to compute the above table:
The annoying part is having to carry the helmet around with you when bike is parked.
I vaguelly remember a study in Denmark (which has roughly 50/50 of people cycling with and without helmets) that showed that cyclists who wear helmets were more likely to have serious accidents than those who did not, though by a small percentage.
There are several factors that are believed to be behind such an unexpected statistic:
Anyways, the point being that at the kind of speed and the environment that people cycle in when just commuting in a city, bicyle helmets can actually make it slightly more dangerous.
Mind you, this doesn't at all mean that in different situations - such as mountain biking or speed cycling - helmets aren't a must.
In places like The Netherlands pretty much nobody uses a helmet when just cycling in the city.
I would really like to see that study. Because I have studies showing the opposite.
Here is an article (in German, sorry) summarizing and contextualising several studies. One showed that wearing a helmet resulted in car drivers keeping five centimetres less distance when overtaking the cyclist, but that study's method was flawed and a study conducted in Berlin with better equipment and better method (bigger sample size, different routes, women being actually test subjects and not just represented by a guy with a wig, etc) that showed helmet wearing bicyclists being overtaken with more distance.
Here (again German, sorry) is a research report comparing 543 accidents with injured bicyclists in University Hospitals of Munich and Münster and 117 accudent fatality from a database. From the 117 fatalities, 50% died of traumatic brain injury and six wore a helmet. Furthermore, from those injured (not the 117 fatalities) and with traumatic brain injury, none wore helmets.
Here (this time in english) is a meta analysis of studies about the safety of wearing helmets when cycling, concluding the discussed studies show a benefit for safety when wearing a helmet while cycling (too much for.me to summarize).
Yes, a motor vehicle is a motor vehicle creating motor vehicle hazards, regardless of how exactly the motor makes its power, and how that power output is controlled.