--- src/cardynamics.cpp	Mon Jan 19 23:26:36 1970
+++ src/cardynamics.cpp	Mon Jan 19 23:26:36 1970
@@ -1791,23 +1791,29 @@
 
 bool CARDYNAMICS::WheelContactCallback(
 	btManifoldPoint& cp,
-	const btCollisionObject* colObj0,
-	int partId0,
+	const btCollisionObjectWrapper* col0,
+	int part0,
 	int index0,
-	const btCollisionObject* colObj1,
-	int partId1,
+	const btCollisionObjectWrapper* col1,
+	int part1,
 	int index1)
 {
-	// cars are fracture bodies, wheel is a cylinder shape
-	const btCollisionShape* shape = colObj0->getCollisionShape();
-	if ((colObj0->getInternalType() & CO_FRACTURE_TYPE) &&
+#if (BT_BULLET_VERSION < 281)
+	const btCollisionObject* obj = col0;
+	const btCollisionShape* shape = obj->getCollisionShape();
+	const btCollisionShape* rootshape = obj->getRootCollisionShape();
+#else
+	const btCollisionObject* obj = col0->getCollisionObject();
+	const btCollisionShape* shape = col0->getCollisionShape();
+	const btCollisionShape* rootshape = obj->getCollisionShape();
+#endif
+	if ((obj->getInternalType() & CO_FRACTURE_TYPE) &&
 		(shape->getShapeType() == CYLINDER_SHAPE_PROXYTYPE))
 	{
-		// is contact within contact patch?
-		const btCompoundShape* car = static_cast<const btCompoundShape*>(colObj0->getRootCollisionShape());
-		const btCylinderShapeX* wheel = static_cast<const btCylinderShapeX*>(shape);
-		btVector3 contactPoint = cp.m_localPointA - car->getChildTransform(cp.m_index0).getOrigin();
-		if (-direction::up.dot(contactPoint) > 0.5 * wheel->getRadius())
+		const btCompoundShape* carshape = static_cast<const btCompoundShape*>(rootshape);
+		const btCylinderShapeX* wheelshape = static_cast<const btCylinderShapeX*>(shape);
+		btVector3 contactPoint = cp.m_localPointA - carshape->getChildTransform(cp.m_index0).getOrigin();
+		if (-direction::up.dot(contactPoint) > 0.5 * wheelshape->getRadius())
 		{
 			// break contact (hack)
 			cp.m_normalWorldOnB = btVector3(0, 0, 0);
--- src/cardynamics.h	Mon Jan 19 23:26:36 1970
+++ src/cardynamics.h	Mon Jan 19 23:26:36 1970
@@ -25,6 +25,12 @@
 class FractureBody;
 class PTree;
 
+#if (BT_BULLET_VERSION < 281)
+#define btCollisionObjectWrapper btCollisionObject
+#else
+struct btCollisionObjectWrapper;
+#endif
+
 class CARDYNAMICS : public btActionInterface
 {
 friend class PERFORMANCE_TESTING;
@@ -151,11 +157,11 @@
 
 	static bool WheelContactCallback(
 		btManifoldPoint& cp,
-		const btCollisionObject* colObj0,
-		int partId0,
+		const btCollisionObjectWrapper* col0,
+		int part0,
 		int index0,
-		const btCollisionObject* colObj1,
-		int partId1,
+		const btCollisionObjectWrapper* col1,
+		int part1,
 		int index1);
 
 protected:
--- src/dynamicsworld.cpp	Mon Jan 19 23:26:36 1970
+++ src/dynamicsworld.cpp	Mon Jan 19 23:26:36 1970
@@ -105,7 +105,7 @@
 	int patch_id = -1;
 	const BEZIER * b = 0;
 	const TRACKSURFACE * s = TRACKSURFACE::None();
-	btCollisionObject * c = 0;
+	const btCollisionObject * c = 0;
 
 	MyRayResultCallback ray(origin, p, caster);
 	rayTest(origin, p, ray);
@@ -221,6 +221,7 @@
 
 void DynamicsWorld::fractureCallback()
 {
+#if (BT_BULLET_VERSION < 281)
 	m_activeConnections.resize(0);
 
 	int numManifolds = getDispatcher()->getNumManifolds();
@@ -268,4 +269,5 @@
 		btRigidBody* child = body->updateConnection(con_id);
 		if (child) addRigidBody(child);
 	}
+#endif
 }