Switched using a motion sensor within the tyre, high powered, tough and durable LED bulbs are built into the tread or wall of the tyre and can either flash or be permanently on, so when the wheel turns at speed, a ring of light is formed whilst continually and perpetually creating its own power.
Manufacturing bicycle tyres with LED lights already built in has significant benefits, not least that pedal cycles become aligned with all road vehicles by having permanent running lights on day and night to maximise visibility regardless of lighting conditions.