The Newtown Creek Wastewater Treatment Plant isn't on the bike tour, but we do recommend the nature walk there.

The Newtown Creek Wastewater Treatment Plant isn’t on the bike tour, but we do recommend the nature walk there.

Saturday is going to be the shit for bikers: in the morning, there’ll be a 19-mile “very scenic, if somewhat fragrant” trek around three of the borough’s five sewage plants. And in the evening, free beer will flow at the launch of Space Ninety 8’s new bike-supplies kiosk.

For the second year, the Brooklyn Sewage Bike Tour is presented by NYC H20, a non-profit dedicated to educating New Yorkers about the city’s water supply.

Riders will meet Saturday at 11 a.m. at the 26th Ward Wastewater Treatment Plant in East New York. At a pace of 10 m.p.h., they’ll travel southwest to Coney Island, where the city’s first sewage treatment system (it now has 14) was established in 1886. At the Neck Road Q train stop, participants will bike northeast to the Owl’s Head sewage plant in Bay Ridge, ending the journey at the nearby R train station. Tickets are $25, plus a service fee.

Saturday from 7 p.m. to 10 p.m., those looking to give their bikes a little TLC can head to  Space Ninety 8, which will celebrate its latest pop-up shop, Bikestock, with free beer and music by DJs Paper Tiger and Dirtyfinger.

Bikestock’s 24-hour kiosks (including one around the corner from Roberta’s) are loaded up with everything to get bikers out of a bind: inner tubes, patch kits, locks, lights, phone chargers — even water, Red Bull and snacks. At the pop-up through June 30, a blue Bikestock vending machine is displayed alongside weatherproof backpacks and totes by MER and Vaya Bags, books and a repair guide, lights and fender products, Bikestock clothing such as t-shirts emblazoned with reflective ink, and maps from Brooklyn’s All You Can Eat Press.