diff --git a/urdf/diffbot.materials.xacro b/urdf/diffbot.materials.xacro
index 035bf58..7fdb6a1 100644
--- a/urdf/diffbot.materials.xacro
+++ b/urdf/diffbot.materials.xacro
@@ -6,35 +6,35 @@ https://github.com/ros-simulation/gazebo_ros_demos/blob/kinetic-devel/rrbot_desc
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diff --git a/urdf/diffbot_description.urdf.xacro b/urdf/diffbot_description.urdf.xacro
index 0774041..6842d91 100644
--- a/urdf/diffbot_description.urdf.xacro
+++ b/urdf/diffbot_description.urdf.xacro
@@ -4,7 +4,7 @@
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@@ -12,228 +12,232 @@
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+ izz="${base_mass / 12.0 * (base_width*base_width + base_length*base_length)}" />
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+ izz="${wheel_mass / 12.0 * wheel_radius*wheel_radius}" />
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+ izz="${wheel_mass / 12.0 * wheel_radius*wheel_radius}" />
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+ ixx="${2.0/5.0 * caster_wheel_mass * caster_wheel_radius * caster_wheel_radius}"
+ ixy="0.0" ixz="0.0"
+ iyy="${2.0/5.0 * caster_wheel_mass * caster_wheel_radius * caster_wheel_radius}"
+ iyz="0.0"
+ izz="${2.0/5.0 * caster_wheel_mass * caster_wheel_radius * caster_wheel_radius}" />
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diff --git a/urdf/odrive.ros2_control.xacro b/urdf/odrive.ros2_control.xacro
index e3007e3..0a15982 100644
--- a/urdf/odrive.ros2_control.xacro
+++ b/urdf/odrive.ros2_control.xacro
@@ -34,4 +34,4 @@
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\ No newline at end of file
diff --git a/urdf/odrive.urdf.xacro b/urdf/odrive.urdf.xacro
index c5a3cca..08acbad 100644
--- a/urdf/odrive.urdf.xacro
+++ b/urdf/odrive.urdf.xacro
@@ -11,18 +11,18 @@
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@@ -31,4 +31,4 @@
enable_joint0="$(arg enable_joint0)"
enable_joint1="$(arg enable_joint1)" />
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diff --git a/urdf/odrive_diffbot.urdf.xacro b/urdf/odrive_diffbot.urdf.xacro
index adc05cd..b5db85a 100644
--- a/urdf/odrive_diffbot.urdf.xacro
+++ b/urdf/odrive_diffbot.urdf.xacro
@@ -16,4 +16,4 @@
joint0_name="$(arg prefix)left_wheel_joint"
joint1_name="$(arg prefix)right_wheel_joint" />
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\ No newline at end of file