How much land do you need for a 15km track?

Let's say you ride 7.5Km one way, then 7.5Km the other. You could easily make this wind around nicely in a 50m wide strip, so the answer is 7.5Km x 50m = 0.375Km2

Or 92 acres or 37.5 hectares.

If you think you can run two tracks side by side in 25m wide strip the number halves. There must be loads of marginal building land around the place which would make awesome trail building land (think sloping hills too steep to farm or build on). Gazza and I were talking about this driving back from Canberra the other week.

P.S Handy hint, you can type '0.375 square km in hectares' into Google and it will do the conversion for you! (http://www.google.com.au/intl/en/help/features.h...).

Build a massive cone shaped hill (like a volcano) and build an access tunnel that runs from the edge of it to a lift in the middle. The lift then takes you to the top and you then ride around and around the conicle hill as you spiral down, down, down to lift level again. I'll TM it Noel's Volcano.