Articles on Mountain Biking and Urban Parks Dirt Rag Magazine Issue 143: Urban Ride Guide New York Times: Bringing the Mountain Bike to Metropolis Articles/Studies on Mountain Biking, Trail Damage and Management IMBA: Environmental Impacts from Mountain Biking IMBA: Trail Shock - Studies Weigh Mountain Biking and Hiking Impacts IMBA: A Study of Walkers and Mountain Bikes in New Zealand Examples of Successful Friends Group <> MTB Chapter Partnerships Philadelphia Mountain Biking Association and Friends of Wissahickon Park