Electric motors are usually torque limited (especially modern inverter driven ones), so they have a constant maximum torque throughout their speed range. Howeve

Electric motors are usually torque limited (especially modern inverter driven ones), so they have a constant maximum torque throughout their speed range. However, this means that at higher speeds, they are able to deliver more power, so gearing is actually beneficial. Formula E cars have 5 gears. There is a lot of work done to change the performance - ideally you'd actually not want flat torque, but high torque at low speed and lower at high speed to reduce the need for switchable gears. This is done with techniques like flux weakening.