FCOM-NO-170-Landing-Rollout.
Max taxi speed is 30kts so this is where you remember it from.
ROLL OUT
Applicable to: ALL
NORMAL CONDITIONS
During the roll out, the rudder pedals will be used to steer the aircraft on the runway centreline. At high speed, directional control is achieved with rudder. As the speed reduces, the Nose Wheel Steering (NWS) becomes active. However, the NWS tiller will not be used until taxi speed is reached.