This year, the bike racers will have to go underground.
A portion of the five-mile race will be inside the Adventure Mine in Greenland, Michigan.
Mine owner Matt Portfleet says it could be a tight fit.
He tells a local TV station tall riders might have to get off their bikes and push.
The mine is now a tourist attraction.
But it had been an active cooper mine in the late 1800s and early 1900s.
The underground bike race is set for July 12.
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