chas
This one looks interesting, and in the Detroit/Ann Arbor area:

http://fargosub48.com/

Quote:
This years ride location will be centered around the Waterloo and Pinckney Recreation Areas in Southeast Michigan. Don’t let the proximity of Ann Arbor or Detroit fool you, this area is remote, beautiful and has plenty of rolling gravel roads not to mention single-track! That’s right, this year we will be tossing some single-track into the rides
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