For people who have ridden both Blacka woods in Sheffield and a trail centre or two, how would you grade the various descents? They are rocky and steep in places and riding up most of them is a b1tch but having no point of reference I don't know how they compare to the stuff you find in trail centres, Blue, Red or Black?
Here if you don't know where I'm talking about.
http://www.bing.com/maps/?v=2&cp=53.321337529126254~-1.569901630282402&lvl=15&sty=s&eo=0&where1=Sheffield%2C%20Sheffield

