Our 3 part system explained
We use the forestry commission / UCI / IMB definitions of trail difficulty:
Green:
Blue:
Red: (The benchmark for mountain trails)
Black: (our definition)
i.e TD: Blue (with 10m Black) or 50%Green 50%Red
Route length and height gained will be given in most cases as a guide. In addition physicality will be indicated by:
1 - Straightforward with opportunities to rest
2 - Fairly sustained throughout, with some short steep climbs
3 - Longer steep climbs where pushing may be resorted to. Several larger climbs (over 150m in height)
4 - Carrying will be necessary, climbs are found throughout the route, some quite long (200m+), significant sections of boggy or rooty trail making straightforward terrain physically taxing.
5 - Don't ask
This is the indication of both how exposed you might feel on a section of trail, and of how exposed you may well be, where falling off would be very bad perhaps. You can have multiple codes from below.
E - You will spend some time a long way away from civilisation (several hours) and you may well begin to feel it
G - There will be sections of trail that you will need to be honest with yourself and your guide about how you feel. They will need flow, confidence and smoothness to ride, and without that, could be hazardous