wall_width = 3;
-wheel_width = 9;
+wheel_width = 7;
wheel_radius =
sqrt(2 * pow(wheel_square_spoke_size / 2, 2)) + wall_width / 2 + 1;
-motor_shaft_radius = 3.7;
-motor_shaft_flat_width = 4.8;
+motor_shaft_radius = 3.9;
+motor_shaft_flat_width = 5.2;
tread_radius = 4 / 2;