Photo courtesy of Ryan Loew/90.5 WESA

One of Pittsburgh’s most popular bicycling events turns 31 years old this Saturday.

The Dirty Dozen bike race challenges cyclists to climb the 13 steepest hills in the city. The 50-mile route takes riders from Highland Park, through the North Hills and the North side, across the Roberto Clemente and Smithfield Street bridges, through the South Hills and the South Side, ending in Hazelwood.

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