Here are some examples of fighters who, imo, belong in each category: GOAT chin - really, it's a three way tie between Chuvalo, McCall and LaMotta Granite chin - Randall "Tex" Cobb, Marvin Hagler Good chin - Muhammad Ali, Vitali Klitschko, George Foreman Average chin - Larry Holmes, Sergio Martinez Bad chin - Lennox Lewis, Tommy Hearns Glass chin - Fraudley "A FARCE" Harrison, Clifford Etienne Worse than glass chin - Amir Khan, Eric Crumble
How many times did he hit the canvas? Quite a few as I recall. Holmes' chin wasn't terrible, but it wasn't rock solid either.