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'E-bike rider' who hit and killed cyclist on shared-use path was on vehicle classed as a motorcycle

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Alex Bowden's picture

Alex Bowden

Alex has been editor of ebiketips since 2021, switching to a world with motors after seven years working on sister site road.cc, where he contributed news, reviews and the occasional feature. These days he combines his road riding with electric bike testing and a dash of ongoing cricket writing (his first book's due out in 2025).

4 comments

5 hours 53 min ago

The law seems pretty wooly when it comes to EPAC power limits. Basically, there seem to be no limits. For sure, we all know about the 250W limit. Except that it isn't a limit in the commonly understood sense - legal EAPCs can exceed 250W, just not "continuously". However, given the nature of cycling, power output is seldom continuous, we all slack off and coast for a few moments, allowing power to exceed 250W the rest of the time.

So I have little doubt that the motors are able to sustain outputs well above 250W. I've even seen UK adverts boasting as much. Even if there is some circuit component designed to prevent this output being genuinely 100% continuous, I doubt it is difficult to find people or YouTubes showing you how to circumvent it.

11 hours 6 min ago

@Rendel Harris - Yes power increases with the square of the voltage.

Power in an electrical circuit = Voltage squared / Resistance

The resistance will increase as a function of heat, although that won't change significatly and the voltage will be the significant factor.

11 hours 39 min ago

Yes you can, many legal ebikes are rated as 250w continuous power and can legally produce more for a short period in boost mode. Any electric motor can produce more power than it's rated for at risk of overheating. 

14 hours 43 min ago

"this suggests either illegal conversion of an unassisted Carrera bike, or potentially the replacement of the original battery from a Carrera e-bike with one unsuited to the motor – perhaps one of a higher voltage than the motor was rated for."

You can't make a motor more powerful by increasing the voltage of the battery, a 250 W motor can only put out 250 W no matter what voltage the battery is.