Roberts originally confessed to police after the assault but changed his story three months later to say while he did pull up in front of Mr Slade twice, it wasn't him who hit him on the third occassion.
He changed his story to say a "stranger" was the one who did it.
The defence didn't call evidence during the two-day trial but in closing arguments defence lawyer Ian Farquhar said it was his position the Crown had the wrong man.
Mr Farquhar said the first interview his client made where he admitted the assault was a lie.
He told the jury the key to the case was the evidence of a nearby road worker, Joseph Kelly, who said he saw a man get out of a second ute and raise his arm.
Mr Kelly said the driver of the silver ute did not get out of his vehicle. Mr Farquhar said Mr Kelly was an independent Crown witness who wasn't challenged therefore his evidence was the "key".
Crown prosecutor Andy Hill said the key element was the issue of identity and the defendant knew "intimate details"about what happened.
Roberts also fitted the description Mr Slade gave of the person who attacked him.
Mr Hill said first and foremost the jury could be confident Roberts was the attacker because he confessed to it.
"That in itself is extremely strong evidence."
Mr Hill said the theory of a mystery man was "preposterous".
"Mystery man doesn't come along until about three and a half months later."
Mr Hill said Mr Kelly admitted in his evidence that his view was partially obstructed and he didn't know there was a cyclist until he heard him crying in pain on the ground.
