SB Nation has an article showing the biggest rivalries in college football. The author begins by using Google to weed out a ranking of said rivalries, so tOSU vs Michigan is tied for first. He continues by then looking into how unpredictable the wins were in the rivalry games, rankings based on the number of statistical upsets.

To measure unpredictability, we'll look for instances when the winning team was at least three points worse that year overall.

Our rivalry: Michigan-Ohio State 4(# of upsets) 94, 95, 96, 01(years) Tied 2-2

Another intriguing rivalry are the 2 Michigan teams, it looks like anytime Michigan is supposed to win, they fail.

The six instances in which an inferior team has won the Paul Bunyan Trophy all have something in common: Michigan State was the lesser team each time. When Michigan State has had the superior team (seven times in the past 30 years), it's won. When numbers say Michigan has the superior team, the fun begins.

http://www.sbnation.com/college-football/2016/6/9/11861066/college-football-rivalries-best?yptr=yahoo