The unprovoked street attack left Rob Mooney with a fractured skull, stab wound and collapsed lung.
His attackers were told they were lucky not to have been facing a murder charge.
But the longest of the jail sentences given out in court w
as five years - which may be halved.
Mr. Mooney told the Advertiser: "I'm physically and mentally scarred for life. I feel these people have got away with it. I've been let down by the justice system."
Joseph Delaney and David Doyle both pleaded guilty to wounding Robert Mooney with intent to cause grievous bodily harm, and William Hall admitted unlawfully wounding him.
Delaney, 27, of Patterdale, Brownsover, who stabbed Mr. Mooney with a carving knife, causing a collapsed lung, was jailed for five years.
Doyle, 19, of Alfred Street, Rugby, who started the attack by hitting their victim over the head with a metal bar, fracturing his skull, was
jailed for three-and-a-half years.
Hall, 18, of Yarrow Close, Rugby, who joined in the attack with a metal bar but only hit Mr. Mooney to the body, was jailed for 14 months.
Mr. Mooney, who lives in Rugby town centre, said: "Their sentences are not long enough for what they did to me. They will be out soon and I won't be living in Rugby when they do."
The 22-year-old was cycling along Elms Drive with his girlfriend in May last year when the group attacked him.
"The stab wound felt like a punch," he said.
"It was so painful. Then I saw blood everywhere and I was in a lot of pain. The pavement was covered in blood. It was then I went into shock."
Mr. Mooney was taken to Coventry University Hospital and was kept there for two days while his wounds were treated.
He said: "My girlfriend still suffers because of the attack, but I'm not scared. I've got to carry on with my life and just get on with it.
"I still suffer from my injuries. I've lost some of the movement in my right hand so I'm constantly reminded of the attack.
"I owe so much to Coventry and Warwick Hospital. I thought my scars would be a lot worse than they are. The way they have put me back together has been amazing."
Mr. Mooney also expressed concerns about the country's knife
culture.
He added: "The Government say knife culture is getting better - it's not, it's horrendously bad.
"I do know I'm lucky to be alive."
