Friends and colleagues posted tributes to the veteran adventurer online.
Red Bull X-Alps, said to be one of the world's toughest paragliding and hiking races, which Mr Nash competed in, wrote on its website: "Steve Nash was well-known for his positive attitude, mental toughness and his true adventurer spirit."
It added: "We are deeply saddened by this tragic news and our thoughts are with family and friends."
One friend posted on Facebook: "To lose a friend and to hear his life was taken simply for a few montary (sic) items that will be soon spent or lost has really rocked me. RIP Steve Nash."
At the request of his family, donations have poured in to a JustGiving page set up by Mr Nash in 2015 to raise money for Wings for Life Spinal Cord Research Foundation.
One post on the page said: "I worked alongside Steve. He was as everyone has said, one of the best with an easy welcoming way for everyone he met. A fellow biker and a true enthusiast of life, he is and will be missed."