There are different recommended sizes for the small step-through (4'11" - 5'4") vs. the small step-over (5'1" - 5'7").Check the web site again.
Great explanation. My neighbor has the Pace 500 and has a lot of trouble with PAS surge. He has lost control a few times in tight turns. I have a Qualisports Volador and the power delivery is ultra smooth.There seem to be various types of Cadence sensing controllers
- Constant voltage - This drives a constant voltage to the the motor, based on the assist level, with the current limited by the controller. At low speed you hit the controller current limit regardless of the assist level. Thus, you get a hard shove even at low levels. The Aventon and Magnum Metro, among other bikes, has this type.
- Constant power - The controller tries to feed the motor a constant power based on the assistance level. Thus,
at low assist levels you get a gentle push. Rad Power Bikes has this type on the Rad City. I much prefer it to constant voltage. You will still get higher torque at low speeds than at higher seeds but the drop-off isn't too steep.
- Constant torque - The torque stays constant based on the assist level until you are going fast enough to hit max power. I don't know of any bikes that have this, but there may be some.
If you are technically inclined, you can see the torque curves for constant voltage (the default) or constant torque (if you select a custom controller with constant torque) at https://www.ebikes.ca/tools/simulator.html. Changing the throttle setting is the equivalent of setting the PAS (pedal assist) level.
Finally, torque sensing bikes work differently, sensing your pedal torque and multiplying that power, giving a fairly natural feeling.