Lights being on in daytime is good for safety, especially if you commute in traffic.
With a dynamo you can leave the light on permanently. No batteries or recharging is required. The system is integrated into the bike and you don’t need to remove the lights when locking up your bike. Being so integrated, they are not vulnerable to the daily jostle your bike endures. Yet we see virtually no dynamo systems on bikes in Australia, NZ, the US and Canada. If they are so good why are they not on new bikes? The main reason is that lights are not required to be supplied with new bikes in these countries. In addition, authorities mostly ignore the fact that some cyclists are riding after sundown without lights, or without effective lights. However just because authorities don't care is not a reason for us to overlook our own safety.
On motorbikes, Daylight Running Lights (DRL) are mandated in many places. The small frontal area of a motorbike has been found to be a reason why they are less conspicuous on the road. Surely this is just as applicable to bicycles. Having your lights on all of the time is simple if you have a dynamo on the bike.
The best dynamos are in front hubs and have to be integrated into the wheel and hence can’t be treated as an after-sale extra.
So, because of the benefit of having lights on all the time, and the independence of making the electricity yourself, with the exception of specific lightweight racing machines, bikes should have dynamo front hubs.
Rechargable lights - why not?
For bicycles, there are some impressive rechargeable battery powered lights. But they are no good when you can’t recharge them which might be an issue when you are on a tour. Even in town, recharging is another chore you may not want. And then you have to make sure they are not stolen.
Whilst a dynamo has a small amount of drag, we reckon recharging batteries daily, over the years, is a bigger drag!
Busch and Muller.
It is impressive to see how the requirement in Germany that new bikes be offered with dynamo lights (with an exception for sub-11kg machines) has fostered innovation in bike lights. They are a bit expensive but they last for years and have amazing features. |