Oversized screen on Wii port (is this the right place to ask about it?)

Running on my european 101 Wii, 480i@60hz mode ClassiCube does not fill the screen properly and is instead zoomed in, which I reckon is an issue I've seen with video out on consoles before. I am on a Samsung T24D391 flatscreen. Is there a setting I could tweak somewhere to enable overscan?