While segments in other activities such as running or road biking stay the same year to year, mountain bike trails can change drastically over time. Things like re routes or natural erosion can make a trail far more technical than it was say 2 or 3 years ago. There are many trails that have top ten all time results from years ago when a trail ran much faster and less technical than its current state. This leaves a lot if segments completely out of reach. I suggest you award trophies and crowns the same way real racing does (year by year). A person could still show their crown in their trophy case from whatever year they earned it, but giving everyone a chance once the new year rolls around to gun for the top not only keeps things exciting, but keeps people motivated to continuously improve on their local tracks. You give the top ten from the previous year a chance to defend their title and see how many years they can stay on top. This would eliminate "dead segments" that have times from 2015 when a trail was a fresh bench cut dirt sidewalk compared to its current rock strewn rain rutted foot out state.