A renewed appeal has been made to help trace Tony Parsons two years on from when he was last seen.
Mr Parsons - now 65-years-old - travelled to Fort William by train from his home in Tillicoultry on Friday, 29 September, 2017.
He travelled south by bicycle along the A82 and was last seen at 11.30pm that night outside the Bridge of Orchy Hotel.
Mr Parsons then continued his journey south in the direction of Tyndrum.
He has not been seen since and neither has his bicycle.
Chief Inspector Drew Sinclair, Clackmannanshire area commander, said: "Our thoughts very much remain with Tony's family, who have had to endure two years of not knowing where he is or what may have happened to him.
"We are determined to provide them with answers and we want to ensure people remain aware that he is missing in case they may have information which could help.
"Neither Tony nor his bicycle have been seen since leaving Bridge of Orchy two years ago.
"I would urge anyone who believes they may have information or perhaps may have seen a bicycle or cycling equipment which looked out of place to come forward.
"Please do not keep anything to yourself if you feel it is small or insignificant. Allow us to make that judgement.
"I would like to thank everyone who has assisted our enquiries so far."
Tony is described as white, 5ft 9ins tall, of stocky build, with short greying hair, a moustache and wearing glasses. He has a tattoo of an anchor on his upper right arm and a tattoo of an eagle on his left.
He was last seen wearing a red waterproof jacket, a blue long-sleeved cycling top, a high-vis vest, fingerless gloves, with beige combat trousers and walking boots.
He was also wearing a silver and grey cycling helmet, carrying a silver and blue rucksack and riding a yellow-framed bike with black handlebars.
Extensive searches were carried out to establish where Tony may have travelled to after leaving the Bridge of Orchy.
The search activity has included a number of specialist Police Scotland resources, including the Mountain Rescue Team, Air Support Unit, and Dog Unit. Civilian volunteers and members of Killin, Oban and Arrochar Mountain Rescue Teams have also assisted with the investigation.
Anyone with information can to contact Police Scotland via 101, quoting reference 559 of 2 October 2017.