While the boneshaker enjoyed a flash of popularity in the United States and Europe, its weight – it could be as heavy as 150 pounds – and other design flaws hastened its demise.
As a new decade began, inventors focused on fine-tuning the two-wheeler in four main areas: weight, speed, performance, and comfort. . . . Meanwhile, the small rear wheel kept down the weight of the machine. Soon there were other innovations. Solid rubber tires and pedals replaced metal ones. Frames were made of steel instead of iron or wood. Seat springs were improved and brakes were added. The weight was reduced to 50 and then 40 pounds.
–Wheels of Change,
Sue Macy
Read the passage, then use the drop-down menus to identify a problem and a solution.
What was one problem of the boneshaker?

What was one solution for this problem?