AFAIK the only normally open access to Mt Grey is by Cramptons Bush Rd from Amberly, there is also a gate there which is locked when the fire risk gets too high, you can call to find out if it's open or not.
You can't access Mt Grey from the Loburn side unless you have a permit. The forrestry owners do have security people in there checking as there have been issues lately. The Forest owners and North Canterbury Cycling have an agreement and Ncci issue permits to members. They are pretty strict with access especially at this time of year when the fire risk is pretty high.. They issue NCCI areas where they are able to ride and out of bounds areas on a weekly basis.
cool. We usually just ride in the DOC bits, that zig zag Mt Grey track from top to bottom is uber fun. But would be interesting in the forest. Your crew built any/much singletrack or is it all forestry trails?
There's 150+k's of roads in there so theres always somewhere different to ride. We can taylor rides to suit the groups abilities, such as avoiding the steeper sections (or zooming in on them!) The only piece of single track is through the bush near where the short up and back Ashley Forest rally sprint is held, its really just a spectator accessway but hey - its fun too! We can (and do) go in there at night as well. It's a fantastic training ground, I've been going in there for years