an indoor training device consisting of three long cylinders connected by belts. Both bike wheels roll on these cylinders so that balancing is much like actual riding.
Relatively small-diameter cylinders, or wide-faced sheaves, that serve as support for ropes.
Relatively small diameter cylinders which are free to turn while supporting ropes Strand - An arrangement of wires helically laid about an axis. or another wire or fiber center to produce a symmetrical section
A device with three or four cylinders in a frame. You can balance a bicycle on them and ride indoors to maintain fitness and work on pedal stroke.
The rollers are the wheel part of the roller assembly that roll freely using ball-bearings.