Michigan State opened at -17.5 against Michigan. I was shocked by that line, I thought it would open at -9.5. People have already jumped on it and have it to -15 now.
I expect it will be right around -11.5 on game day.
The one thing you can depend on from Michigan fans is they will totally skew a line with homer bets and leave you a desirable betting situation. Still though, I'm not touching this game.