Thanks Guys. I've just changed the rear sprocket from 47T to a 40T as I've got about three hours of road before I hit the trail. It really makes the bike a lot easier to ride
I won't be climbing goat tracks with it so the longer gearing will be fine. The road/track is pretty easy so I don't think I'll be chewing up too much gas - but I will bring an extra two gal container of gas. Also I'll bring a tow rope. The great thing about having a plan B in place is "if you have it you don't need it" And I hope not to need it.