The Lewes to Newhaven road was temporarily blocked at Swanborough Hollow at 8.50am on Tuesday May 27 after a motorcyclist crashed near the Abergavenny Arms in Rodmell.
The Kent Surrey and Sussex Air Ambulance attended but the motorcyclist was taken by land ambulance to the Royal Sussex County Hospital, Brighton, after it was established his condition was not life threatening.
One lane of the C7 was re-opened to traffic soon afterwards.
No other vehicle was involved.
Anyone who saw what happened is asked to phone Sussex Police on 101 or email firstname.lastname@example.org quoting serial 0205 of 27/5.