I’m heading up to Detroit this weekend to visit family and was thinking about bringing my gravel bike with me. Any good gravel routes around the Royal Oak area or within a 30 minute drive?
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When I'm in Ann Arbor visiting family, I ride the roads NW of town (search for the Dirthammer loop on Strava).  Probably more than 30 min from Royal Oak.

I've seen people riding cross bikes on the trails at Island Lake Recreation Area (E of Brighton), but haven't tried it myself.
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Waterloo Grit and Gravel 30 or 60 mile event was this past weekend.  All gravel.  It was about an hour from Royal Oak.  30 minute drive would mean going north into Oakland County. Poly Ann trail, and the dirt roads around there would be your best choices.
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