Free wheeling!

Put your pedal to the metal and come on down to Bike Bonanza on Sept. 19 at Sunken Playground.

This family-friendly event provides info on everything related to bicycles including learning how to ride for kids, bike safety materials, free helmets and helmet fittings, and a kids bike swap. Instructors teach the basics of starting, stopping, steering, and how to balance on two wheels.

Bike Bonanaza, Sept. 19 from 11 am to 2:30 pm; free

Sunken Playground (Amsterdam Avenue and W. 166th Street in Harlem; www.nycgovparks.org).