Officers were on plain-clothed patrol in Trelai Park in response to community concerns about anti-social behaviour and drugs.
They became suspicious when they witnessed the rider of the bike involved in a drug deal.
Smith, 20, was arrested and was found in possession of £4,000 worth of Class A drugs in a range of packaging, four mobile phones, and cash.
One of the phones contained messages going back to January where he had been offering to supply controlled drugs.
Following his arrest on the afternoon of Monday, March 10, Smith pleaded guilty to being concerned in the supply of controlled drugs of Class A, namely crack cocaine and heroin, possession with intent to supply a controlled drug of class A, namely crack cocaine, cocaine and heroin and possession of criminal property.
He was sentenced at Newport Crown Court this week (Tuesday, April 8) to three years and eight months in prison.
