They built racetracks out of pine and called it a sport. The public called them something else. The forgotten story of America's board-track era—and why every one of them vanished. . . . #OneLungRacing #2Stroke #boardtrack #motordrome #motorcyclehistory #vintagemotorcycle #racinghistory #indianmotorcycle #excelsior #harleydavidson #classicmotorcycle #motorcycleracing #dangerousracing #motohistory #vintageracing #1910s #americanhistory #twowheels #caferacer #motorbike #speedway #historicracing #bikelife #motorcycleculture