Pocket Bicycles was the name of a manufacturer of portable bicycle

Portable bicycle

A portable bicycle is a bicycle that has been designed to be small and light enough for easy carrying. It is usually dismantled to make a convenient bundle and the frame often has a folding action to facilitate this. The design of a portable bicycle involves a trade-off between easy of carrying...

s located in Massachusetts

Massachusetts

The Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...

 in the 1970s. While resembling many of the small-wheel folding designs of the time, the bicycle was distinctive in having no down tube, merely a cable that was kept under tension by the weight of the rider, thus saving weight and space. In addition, the cable provided a degree of vertical flex in the frame which acted as a suspension

Bicycle suspension

A bicycle suspension is the system or systems used to suspend the rider and all or part of the bicycle in order to protect them from the roughness of the terrain over which they travel...

 system, thereby absorbing much of the bumpiness of the ride normally associated with small wheel bicycle

Small wheel bicycle

Small wheel bicycles are adult bicycles which have wheels of 20 inch nominal diameter or less, which is smaller than the 26" or 700c sizes common on most full-sized adult bikes. While many folding bicycles are small wheel bicycles, not all small wheel bicycles can fold...

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