Bicycle trainer

A trainer consists of a frame, a clamp to hold the bicycle securely, a roller that presses up against the rear wheel, and a mechanism that provides resistance when the pedals are turned.

In a wind trainer, the roller drives fan blades that create air resistance.

Some magnetic trainers have handlebar-mounted control boxes to change the level of resistance during a training session.

Trainers make it possible to build bicycle skills and power very efficiently in a highly controlled environment, without the unavoidable interruptions of outdoor riding.

Trainers require better technique than stationary bicycles, and they provide a more realistic-feeling ride.

Power output, cadence, virtual speed and heart rate are among the metrics that can be transmitted electronically.

There are also smart non-interactive trainers, which cannot adjust the resistance but only transmit the rider's data like power or cadence.