South of Edinburgh near Craik, a great 5.6 mile mountain bike loop circles Knowebog Hill and summits Crib Law.
Starting in Craik, head west on forest roads to Wolfcleuchhead at 1.7 miles. Continue north until 3.15 miles and then head west up Crib Law. Proceed down eventually heading southeast into Craik.
Overall, Knowebog Hill Loop is the 45th most popular mountain bike trail of all 93 mountain biking rides in UK.