“You’d have to buy more food to give you more energy to pedal against the dynamo!”
rob dean did the maths on that
2) Isn’t a dynamo draggy? Well, Please excuse the maths, but if you rode at 20mph for an hour the light would pull about 6W from your legs during this time, this is equivalent to approximately 5.2kcal. There are approximately 72kcal in a McVites Digestive biscuit, enough to power your light for just under 14hrs and that’s assuming you pedal down the hills and around every corner! So yes, it does draw a tiny bit of power, but I certainly can’t tell the difference and it’s a damn good excuse to eat an extra biscuit every few rides 😉
I have a revo – its good when i ride alone …. utter tosh in group rides as invariably they stop at the top of climbs before good decents to regroup …. by which point my lights gone dim so i ride the first 10metres blind 😀
Using oliverracings maths my E cargo bike costs 12pence to charge…. WIN