Michigan Mountain Biking Association
There is only 12.5-13mi of trail there.
What you may be doing is missing the last half of GNU loop and the Southeast part of the South Loop.
Its easy because the hair pin is on a downhill and the tendency is to keep rolling through and up the concrete climb. (which you do when on the South loop.)
You need to complete the tight hairpin at the bottom and then it takes you back up and back across the walking path.
Basically the GNU loop and the South share this little section of trail, even though the map shows they are separate.
This will take you back to where you entered GNU and then you need to take the connector back over to the Y to finsh South and North.
I have a Marked Map of what I described so PM me your email and I can send it to you.
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