Before revision:  Here, we present a method that allows us to measure stator dynamics across a large range of external loads, including near the zero-torque limit : By attaching superparamagnetic beads to the flagellar hook, we can control the motor's speed via a rotating magnetic field.
After revision:  We present a method that allows us to measure stator dynamics across a large range of external loads, including near the zero-torque limit : By attaching superparamagnetic beads to the flagellar hook, we can control the motor's speed via a rotating magnetic field.