If you want to test your mettle the Tatanka 100 is the place to do it.. No Bull about it!
And if 100 miles of the Black Hills is a bit too much to tackle take a look at Sturgis BAM. 35 miles of the best the Black Hills has to offer in a point-to-point format with a great after ride venue. Bring the whole family, there is something for everyone!
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: June/July Black Hills Races