How much does a knights suit of armor weigh?

It had many layers of metal, leather and padded cloth. So it mast have weighed a lot!

* Movie-Montage.com - Low Rider - A Knight's Tale - Knight Sur…

Most suits of armor weigh 150 to 225 pounds. ... Even with only half the armor, we're still talking 75 pounds of rather cumbersome weight. ...

** http://www.movie-montage.com/image/74.php 150 to 225 pounds, Not a chance!

The standard armour worn on a field of battle was around 55-65 pounds.

Heavy yes but not so heavy that the knight could not fight. Jousting suits were heavier (perhaps 100ish pounds) but were never meant to be used in battle.