A jury at the High Court in Edinburgh saw shocking video footage of Ewing attacking the bikers near Cullen in Moray on September 8, 2018.
Jurors saw Ewing and his sidekicks striking Colin Sutherland, John Sutherland, Edward Forrest and Nicky Syratt with a claw hammer, a tyre iron and a baseball bat.
Moments earlier Ewing had driven his Vauxhall Insignia at Colin Sutherland and collided with the motorcyclist forcing him to fall off his bike.
Jurors also saw Ewing and his accomplices use a knife to cut off waistcoats bearing the ‘Nomads’ name.
After being arrested, police found evidence linking Ewing to the Blue Angels MC
Today, staff at the Court of Criminal Appeal confirmed that Ewing’s lawyers had written to them notifying them of his intention to appeal.
It is not known at this stage whether Ewing intends to appeal against his conviction or sentence.
Jurors convicted Ewing, of Aberdeen, on a charge of attempting to murder Colin Sutherland and of assaulting John Sutherland to his severe injury and permanent disfigurement.
He was also convicted of assaulting Mr Forrest to his severe injury and to the danger of his life.
Source: The Press and Journal