The RipCurrent S and CrossCurrent S can travel up to 20 mph using only the throttle and no pedaling. If you use the pedal assist feature, the bike can travel up to 28 mph.
If you use the bike in Off-Road Mode, you can go about 30-31 mph using the pedal assist. In this mode, the speed is limited only by the power available to the motor and the power you contribute through pedaling. The bike will not be limited by the software.
In all cases, the speed capable by the throttle alone is 20 mph in accordance with regulations.