The Strathpuffer, a 24-hour mountain bike endurance event, was held at the weekend. Pictures by Paul Campbell
The challenge was first held in 2005 and organisers thought it would be a one-off, but it has become an annual event
Cyclists spend most of their time in darkness on tracks near Strathpeffer in the Highlands
This year entrants had to contend with muddy conditions, but in the past the event has been held amid snow and ice
Individuals, pairs and teams of four can enter
Its organisers say the challenge now has legendary status and gained recognition from US bike magazines
