Cross-countrycycling is a discipline of mountain biking. Cross-country cycling became an Olympic sport in 1996 and is the only form of mountain biking practiced at the Olympics.
Terrain
Cross-country cycling is defined by the terrain on which it is performed. XC courses and trails consist of a mix of rough forest paths and singletrack, smooth fireroads, and even paved paths connecting other trails. Until recently cross-country trails were deemed "easy" or "intermediate", due to the concept that this discipline of mountain biking relies more on physical prowess than technical ability.
Bikes and equipment
Cross-country bicycles are some of the lightest mountain bikes, typically between. They usually feature suspensionforks in front and sometimes have suspension in the rear. In both the front and rear, most XC bicycles have approximately of suspension travel, although some riders prefer of travel as bicycle frame strength and technology advance. The geometry of the frames generally places the rider in a little more upright position than on a road bicycle but much less than on a downhill bike. Bicycle helmets are often used for cross-country riding. However, XC riders only rarely wear full-face helmets and do not wear the full body "armour" employed by downhill riders. Cross-country cyclists are more prone to injuries than road cyclists; however, the injuries sustained by XC riders are usually not as severe.
Racing
Cross-country racing emphasizes endurance above technical prowess, and races vary from 30 minutes to 24 hours in length. Additionally, many mountain bike races are divided up into stages so as to span several days. Races can be either point-to-point or lap-based. Short-track cross-country consists of many very short laps so as to be spectator-friendly. Unlike downhill races, which are conducted in a time trial format, cross-country races traditionally feature a mass start or interval start, where riders are released in several large groups divided by age and/or ability. Races with very large fields that do not wish to stagger starts will sometimes employ a Le Mans start where racers begin by running to their bikes. . Globally, XC racing is governed by the Union Cycliste Internationale. In the United States, it is under the purview of USACMTB a division of USA Cycling. In the United Kingdom, British Cycling is the governing body.
Racing disciplines
There are some XC racing disciplines, like XCE, XCO or XCM.
With a route usually between 65 and 100 km. It has gained popularity in the last years, because XCM competition participation is open to everyone, including beginners.
Wheel size
In cross-country, more than other areas of mountain biking, a debate has begun over the optimal wheel size. The 26-inch wheel size that was settled on with the inception of the current age of mountain biking has all but died off at the top level of cross-country racing as 27.5 inch and 29 inch wheels are much more popular now. 650b wheels are 584 mm diameter wheels, and approximately 27.5" with a mounted tire. 650b bikes are becoming ever more prevalent, while 29" bikes, or "29ers" experienced rapidly gaining popularity in the mid to late 2000s, and having some success in cross-country racing, but more so in marathon cross-country. A notable boost to their popularity came with Lance Armstrong, racing and winning on a Gary Fisher 29er. Advantages to the larger wheel formats are less need for suspension due to a decreased angle of attack, and also less loss of momentum. Disadvantages include increased weight, decreased acceleration, higher rolling inertia, rider fit issues for those under 5'5", and slower handling, although handling issues are being addressed successfully in newer designs with geometry changes like steeper head tube angles and higher fork offsets. A further disadvantage is that, all other variables being equal, a 26" wheel will be much stronger than a 29" one.
