Roberts' sister Irene Richards told the court the family did not condone her brother's actions.
"We want to acknowledge the hurt and suffering of the victim and his family and offer our sincere apologies," Ms Richards said. "We don't understand how this occurred but ultimately as a family we shoulder the blame. We are terribly sorry and offer our deepest apologies."
Ms Richards made a plea to grant her brother home detention as their mother needed him on the farm. A letter of apology was written by Roberts to Mr Slade but Judge Phillip Cooper said it could not be taken as genuine remorse.
Outside court, Mr Slade told the Rotorua Daily Post he was satisfied with the sentence. He accepted reparation and an another apology from a family member of Roberts.
He had previously refused reparation of more than $2000 as it was "too little, too late".
"I'm unable to train to the level I was once able to ... it's gutting, I've represented New Zealand in triathlon," the father-of-five said.
"To my fellow athletes let this be a warning to be careful out there, there are a lot of drivers who think cyclists are an inconvenience on the roads."