On a bicycle fitted with a rigid saddle and with hard tires, Stop Killin’ Black People Shirt well blown up, the vibration that is conveyed through the entire machine is very perceptible, even on a smooth wheeling surface. Over uneven country, Belgian blocks, or other rough or corrugated surfaces, the vibration produces concussion; and if too erect and rigid a position is maintained, fatigue, if nothing worse, is sure to result.
