The big 10 is a .500 bowl conference. Here are the team records in the previous 5 years: First is S/U, then ATS.
Illinois. 2-0, 2-0
Indiana. 0-0
Iowa. 2-3, 3-2
Michigan. 1-3, 1-3.
Michigan State. 3-2, 3-2.
Minnesota. 0-3, 1-2.
Nebraska. 1-2, 1-2 since joining the Big 10.
Northwestern. 2-3, 2-3.
Ohio State. 2-2, 2-2.
Penn State. 1-2, 1-2.
Purdue. 1-1, 1-1.
Wisconsin. 1-4, 2-3.
Total: 18-23. 19-22. Not a lot to choose from.