ok this is taken from the airbus Flight Crew Trg Manual (FCTM).
rudder full deflection on the 320 is 6 degrees
TILLER AND RUDDER PEDALS USE
Pedals control nosewheel steering at low speed (
± 6 degrees with full pedal
deflection). Therefore, on straight taxiways and on shallow turns, the pilot can
use the pedals to steer the aircraft, keeping a hand on the tiller. In sharper
turns, the pilot must use the tiller.