Colne Valley Mountain Bike Challenge 2010 Posted On: 09/05/2010By: Richard Over 300 mountain bikers lined up for the Colne Valley Mountain Bike Challenge, with a steep cobbled climb to get the riders warmed up, this is a true test of a riders ability with numerous climbs and tough off road sections along the route. YouTube Video – Part 1 – Part 2 – Part 3 – Part 4