Ground Truth: a bike sensor that maps wealth by how hard you pedal

Justin Blinder came up with Ground Truth after getting laid off in 2020. He started delivering food by bike around Brooklyn and noticed something most folks ignore: two neighborhoods right next to each other can feel worlds apart economically and psychologically.

The device is a small sensor you clip onto your bike. It reads the effort it takes to pedal up and down the same hills — the steeper the climb, the heavier the load, the more your legs are working against gravity. Those numbers become a proxy for how taxing a neighborhood is. The idea is that wealthier areas tend to have flatter, smoother streets, while working-class parts of town pile on more resistance: potholes, curbs, hills, the daily grind.

Blinder is an artist and technologist based in Brooklyn. He's not trying to sell a new luxury bike computer. He's trying to show what the streets look like when you're actually moving through them, on two wheels, paying with your legs.

The story is about a sensor. The real story is about what the sensor captures: the invisible tax of living in a place where the roads are rougher, the hills are steeper, and the rent eats more of your paycheck.

Why this matters for us: it puts a number on the commute we already know in our bones — the way a few extra blocks of bumpy pavement can feel like a toll booth for the folks who can't afford a car.