diff --git a/Code/GamePhysics/Implementation/SphericalRigidBody.cpp b/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
index baf8d98b..292a2dd2 100644
--- a/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
+++ b/Code/GamePhysics/Implementation/SphericalRigidBody.cpp
@@ -21,7 +21,7 @@ SphericalRigidBody::SphericalRigidBody( const API::SphericalBodyDescription &des
 {
 	this->rigid = RigidBody( Box( desc.rotation, desc.centerPosition, Float3(2.0f * desc.radius) ),
 							 desc.mass,
-							 desc.inertiaTensor );
+							 MomentOfInertia::CreateSphereMatrix( desc.mass, desc.radius ) );
 	this->gravityNormal = Float3::null;
 
 	if( desc.subscription )
diff --git a/Code/GamePhysics/PhysicsAPI.h b/Code/GamePhysics/PhysicsAPI.h
index dd36a9ee..6cba993c 100644
--- a/Code/GamePhysics/PhysicsAPI.h
+++ b/Code/GamePhysics/PhysicsAPI.h
@@ -415,7 +415,6 @@ namespace Oyster
 			::Oyster::Math::Float3 centerPosition;
 			::Oyster::Math::Float radius;
 			::Oyster::Math::Float mass;
-			::Oyster::Math::Float4x4 inertiaTensor;
 			ICustomBody::EventAction_Collision subscription;
 			bool ignoreGravity;
 
@@ -425,7 +424,6 @@ namespace Oyster
 				this->centerPosition = ::Oyster::Math::Float3::null;
 				this->radius = 0.5f;
 				this->mass = 10.0f;
-				this->inertiaTensor = ::Oyster::Math::Float4x4::identity;
 				this->subscription = NULL;
 				this->ignoreGravity = false;
 			}