Thanks John H. for the tip!
According to the 2005 International Mountain Biking Association Report Card of US trail systems, Michigan's mountain biking trails are among the best in the nation. With a B+ ranking, Michigan trailed only Virginia, West Virginia, Utah, Arizona and Colorado. Ratings are based not only on trail quality, quantity and access for off-road bicycling, but also strength of local organizations, percent of trails open to riding and threats to bike access.

Michigan state parks and recreation areas offer 881 miles of non-motorized trails with 264 miles designated for mountain bike and bicycle use. State Forest trails offer an additional 900 miles of non-motorized trails.

DNR Trailsearch
International Mountain Biking Association site
Michigan Mountain Biking Association web site

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