Originally Posted by
Polaris OBark
There is.
For class 1, assist must cut off at 20mph. The high-quality systems like Bosch make a big selling point of how they ramp down the assist as they approach 20 mph so that the transition is smooth. In other words, if you are pedaling at 21 mph, you are doing so without any assist on a class 1 ebike. I tried this on my wife's bike. The transition is smooth, but I can feel it.
For class 3, the cutoff is 28mph. I assume it works the same way with the throttle and class 2.
Thanks.
It's the easiest thing to do.
Originally Posted by
jon c.
(b) For the purpose of this section, the term `low-speed electric
bicycle' means a two- or three-wheeled vehicle with fully operable
pedals and an electric motor of less than 750 watts (1 h.p.), whose
maximum speed on a paved level surface, when powered solely by such a
motor while ridden by an operator who weighs 170 pounds, is less than 20
mph.
Note that this (a federal consumer safety law) is not requiring a cut-off just based on speed. (It's also not talking about e-bike classes, which can and do have other requirements.)
For this particular law, clearly, a speed-only cut-off is sufficient but not necessary.