Emergency services were called to the collision at around 12.15pm in Findon Road, Worthing.
A police spokesman said the cyclist had hit the back of a stationary van.
She said: “The cyclist has been taken to Worthing Hospital with suspected back injuries.
“The road southbound was blocked for a while but has now re-opened.”
An eyewitness who was near the scene said he knew the cyclist and that he ‘seemed ok’.
He added: “One of our cycling club members called for an ambulance.
“His carbon bike frame snapped in two places.”
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