Avon & Somerset Police are appealing for spectators with video or photos of the fatal accident to contact them.
The crash happened as 23-year-old cyclist Junior Heffernan came round a bend during the Severn Bridge Road Race.
Here is Acting Inspector Darren Jarvis...
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Chillier this evening with largely clear skies.
Mainly dry with sunny spells this afternoon.
A thief who tried to snatch £20 from a disabled teenage girl has been jailed after she fought him off and passers-by pinned him down.