Cross country rental bicycles are a great way to enjoy Bulgarian nature on your own. The most popular discipline of mountain biking, cross-country biking is an Olympic sport since 1996. This type of cycling is determined by the terrain - a mixture of uncultivated forest pathways, evenly roads, single trails and paved surface. Depending on the technical complication it may be divided between riding (XC bikes) and racing. XC bikes vary from 7 to 16 kg. They offer suspension forks in front and sometimes at the rear, full fender for protection and more upright biker's stand than on a road bike. In cross-country racing endurance is a major point as races may last from 35 minutes to 24 hours. The size of wheels may vary from approximately 66 cm to around 74 cm. The most popular examples of cross country include FERRINI R 3, Rocky Mountain Element 70 RSL, Rocky Mountain Element 70 MSL, Rocky Mountain Vertex 970 RSL 29, Scott Spark 29 Elite, Scott Scale 29 Elite and Diamondback Overdrive Pro.