Mountain Biker Club | Mountain Biking Blog | Bike Reviews A mountain bike or mountain bicycle (abbreviated MTB or ATB (all-terrain bicycle)) is a bicycle created for off-road cycling. This activity includes traversing of rocks and washouts, and steep declines, on dirt trails, logging roads, and other unpaved environments — activities usually called mountain biking. Mountainbikerclub.com~Site InfoWhoisTrace RouteRBL Check