"The Shift bicycle features a swinging rear hub, which allows the rear wheels to pitch in and out. The hub allows for the rear wheels to provide a larger or smaller stance depending on the amount to weight on the rear wheels. An internal belt keeps the drive train away from the children for safety." - designapkin.com
The Purdue University Bicycle Saves Parents Money
Industrial designers at Purdue University have fulfilled every kid's dream--they've created a tricycle that can shift into a bicycle, making them an instant 'big kid'.