diff --git a/official_models/ev3/education_core/robot_educator/.gitignore b/official_models/ev3/education_core/robot_educator_ultrasonic/.gitignore
similarity index 100%
rename from official_models/ev3/education_core/robot_educator/.gitignore
rename to official_models/ev3/education_core/robot_educator_ultrasonic/.gitignore
diff --git a/official_models/ev3/education_core/robot_educator/.vscode/extensions.json b/official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/extensions.json
similarity index 100%
rename from official_models/ev3/education_core/robot_educator/.vscode/extensions.json
rename to official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/extensions.json
diff --git a/official_models/ev3/education_core/robot_educator/.vscode/launch.json b/official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/launch.json
similarity index 100%
rename from official_models/ev3/education_core/robot_educator/.vscode/launch.json
rename to official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/launch.json
diff --git a/official_models/ev3/education_core/robot_educator/.vscode/settings.json b/official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/settings.json
similarity index 100%
rename from official_models/ev3/education_core/robot_educator/.vscode/settings.json
rename to official_models/ev3/education_core/robot_educator_ultrasonic/.vscode/settings.json
diff --git a/official_models/ev3/education_core/robot_educator/main.py b/official_models/ev3/education_core/robot_educator_ultrasonic/main.py
similarity index 90%
rename from official_models/ev3/education_core/robot_educator/main.py
rename to official_models/ev3/education_core/robot_educator_ultrasonic/main.py
index 197d6a9..b6d4177 100644
--- a/official_models/ev3/education_core/robot_educator/main.py
+++ b/official_models/ev3/education_core/robot_educator_ultrasonic/main.py
@@ -20,8 +20,9 @@ right_motor = Motor(Port.C)
 # The DriveBase is composed of two motors, with a wheel on each motor.
 # The wheel_diameter and axle_track values are used to make the motors
 # move at the correct speed when you give a motor command.
-# The axle track is the distance between the centers of each of the wheels.
-robot = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=114)
+# The axle track is the distance between the points where the wheels
+# touch the ground.
+robot = DriveBase(left_motor, right_motor, wheel_diameter=55.5, axle_track=104)
 
 # Play a sound to tell us when we are ready to start moving
 ev3.speaker.beep()