Speaking of Biopace, I'm converting my wife's old Schwinn to SS (not fixed) and it has 42 and 52 tooth biopace chainrings. I wasn't planing on using a chain tensioner since she has pretty long horizontal dropouts, but because of the biopace rings, will a chain tensioner have enough play in it to keep a good tension throughout the revolution, or should is just use the method stated above (tension the chain so it's just barely tight/loose depending on the point of the rotation)?