The Brooklyn Public Library is scheduled to host its fourth annual Bike the Branches this Saturday.
The ride passes by the library's 60 branches in the borough.
Riders are issued "branch passports" and get a stamp at each library they visit along the way.
The libraries are open for riders from 10 a.m. until 5 p.m. The day wraps up with a block party on Grand Army Plaza from 3 p.m. - 7 p.m.
Registration is $20 for adults and $10 for kids. The money goes toward the library's programs and services.