Cycles [noun]

Scarcely taking time to look the motor-cycles over, they pulled them upright and got into the saddles.

Now, what is this power that has formed these glorious suns and sent them whirling onward through the cycles of the ages?

In the narrow seat behind, Clip lurched, and swayed, and rattled the motor-cycles.

Hitherto, all motor-propelled cycles had used the power of the engine of whatever form it was merely as an aid to locomotion.

Matt waved his hand, and the sharp explosions of the two motor-cycles merged into a steady hum as the boys vanished up the road.

The marks left by the pneumatic tires of the motor-cycles could be clearly seen; and on either side of them was a heavier mark.

He saw the two motor-cycles leaning against the wall of the house, and he didn't have to guess very hard to know who was around.

Matt whirled away from the freighter, to help Chub get the motor-cycles down.

It wobbled around, going up to two-point-seven cycles and dropping back to one-point-four, then climbing again.

Finally, it dropped suddenly to a low of point-oh-five cycles, hovered there for a moment, then vanished altogether.