Great Britain's Jody Cundy says he is "gutted" after officials denied him a restart in the 1km time trial and apologises for losing his temper following the decision.
Jon-Allan Butterworth took silver for GB behind Spain's Alfonso Cabello as Cundy raged in the centre of the track.
Cundy, the C4 world record holder and world champion, had appealed for a second attempt as his rear wheel slipped leaving the starting gate.
However, officials ruled the fault lay with Cundy rather than the equipment.
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