Character SetRadius()

[Lethal Raptor Games 199]

I can't seem to adjust the radius of my players character controller;

physicsPivot->SetGravityMode(false);
physicsPivot->SetDamping(0.0f, 0.0f);
physicsPivot->SetPhysicsMode(Entity::CharacterPhysics);
physicsPivot->SetCollisionType(COLLISION::PLAYER);
physicsPivot->SetMass(1.0f);
physicsPivot->charactercontroller->SetMaxSlope(80.0f);
physicsPivot->charactercontroller->SetRadius(0.2f);
float r = physicsPivot->charactercontroller->GetRadius();

The change is being detected in the variable "r" but in game there is no difference.    Any suggestions?