A TT rider died in a high speed crash because of a "mechanical defect", an inquest at Douglas Court House heard.
Martin Loicht, 47, from Austria, suffered chest injuries in a crash at the Quarry Bends section of the TT course on 10 June.
The bike's chain jammed causing the rear wheel to lock and the rider to lose control, the inquest heard.
An accidental death verdict was recorded by The Coroner of Inquests Alistair Montgomerie.
Mr Loicht was a Professor of Engineering in Vienna, and left behind wife, Nicola, and three children.
TT marshals at the scene of the crash described how Mr Loicht's bike veered sideways, throwing him off the machine and into hay bales.
He was conscious at the scene and was taken by air ambulance to Nobles Hospital but died the same day.
Mr Montgomerie expressed his "deepest sympathies" for his friends and family.
"The vast majority of deaths in the TT are down to a loss of control by the rider.
"What makes Martin's death particularly tragic is that he was negotiating the course in a proper manner and crashed due to unforeseen circumstances," he said.
Mark Pattison from the Department of Infrastructure, who examined the machine after the crash said that despite the chain being in a "nearly new condition", it had jammed, eventually snapped and caused the rider to lose control.
He went on to say that there were no signs of neglect and that the bike appeared to be well prepared for the race.