Gruber's Grinder

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Gruber's Grinder is a mountain bike trail in the Holly Recreation Area near Holly, Michigan. It was created by Paul Gary Gruber, a Michigan native and longtime rider who earned second place in races for Tail Wind Production and the MMBA Points Series. Gruber helped develop race venues in the region, including the Big M and Owasippi trails, and personally mapped, designed, and built this trail. The route is a technical 15.6-mile single-track that is tight and twisty, offering a challenging ride in Southeast Michigan.