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Cyclo-cross ( cyclocross, CX, cyclo-X or cross) is a form of bicycle racing. Races typically take place in the autumn and winter (the international or "World Cup" season is October–February), and consist of many laps of a short (2.5–3.5 km or 1.5–2 mile) course featuring pavement, wooded trails, grass, steep hills and obstacles requiring the rider to quickly dismount, carry the bike while navigating the obstruction and remount. uci.ch UCI Cyclo-cross regulations
with the distance varying depending on the ground conditions. The sport is strongest in the traditional road cycling countries such as Belgium (Flanders in particular), France and the Netherlands.
Cyclo-cross has parallels with mountain bike racing, cross-country cycling and criterium racing. Many of the best cyclo-cross riders cross train in other cycling disciplines; however, cyclo-cross has reached such size and popularity that some racers are specialists, and many prioritize cyclo-cross races over other disciplines. Cyclo-cross bicycles are similar to road : lightweight, with somewhat narrow tires and drop handlebars. They are typically differentiated by their greater tire clearances, lower gearing, stronger frames, cantilever brakes or disc brakes and more upright riding position. They also share characteristics with mountain bikes in that they use knobby tread tires for traction and disc brakes. They have to be lightweight because competitors need to carry their bicycle to overcome barriers or slopes too steep to climb in the saddle. The sight of competitors struggling up a muddy slope with bicycles on their shoulders is the classic image of the sport, although unridable sections are generally a very small fraction of the race distance.
Compared with many disciplines of road and track cycle racing, tactics are fairly straightforward, and the emphasis is on the rider's aerobic endurance and bike-handling skills. Drafting, where cyclists form a line with the lead cyclist pedaling harder while reducing the wind resistance for other riders, is of much less importance than in road racing where average speeds are much higher than in cyclo-cross.
A cyclo-cross rider is allowed to change bicycles and receive mechanical assistance during a race. While the rider is on the course on one bike, their pit crew can clean, repair and oil a spare.
After Octave Lapize attributed his win in the 1910 Tour de France to his off season training in cyclo-cross books.google.com Herlihy, David V. "Bicycle: The History", page 397. Yale University Press, 2004. the sport began to spread to countries bordering France. Belgium organized its first national championship in 1910, Switzerland did so in 1912, then Luxembourg in 1923, Spain in 1929 and Italy in 1930.
Cyclo-cross proved itself as a sport extending beyond the boundaries of France when in 1924 the first international race, Le Critérium International de Cross-Country Cyclo-Pédestre, was held in Paris.
Like many international , cyclo-cross is administered by the Union Cycliste Internationale; although it was not until the 1940s, around 40 years after cyclo-cross' inception, that the UCI began its regulation and the first world championship was held in Paris in 1950.
The first United States Cyclo-cross National Championships took place on 20 October 1963, in Palos Park, IL, near Chicago. cvccbike.com Schwartz, Bob. The 1963 US Cyclocross National Championships. These championships in the midwest continued until 1969. Cyclo-cross began to become popular in the United States in the 1970s, in New England and California. The Cyclo-cross National Championships restarted in 1975 in Berkeley, CA and have continued to be held every year at various locations throughout the United States. The Surf City race series held in Santa Cruz, CA has contributed to the history of cyclo-cross in the United States. The sport has experienced a growth in popularity in the United States since the mid-1990s. books.google.com Burke, Edmund R. & Pavelka, Ed: "The Complete Book of Long Distance Cycling", Page 254. Rodale, 2000. Cyclo-cross races are now regularly held in the fall and winter seasons throughout the United States and continue to grow in popularity.
Riders' age categories for cyclocross under UCI rules are currently determined by their age on 1 January which lies in the middle of the international season, i.e. they compete in the same category that they would be in for the following road season.
Cyclo-cross bike design and frame geometry has evolved over the years. The first cyclo-cross bikes were touring-type road bikes, used for their cantilever bosses, slacker angles and wider tire clearance. Over time as the sport became more formalized, frame angles changed for quicker handling and bottom brackets heights were raised to clear broken ground. Most cyclo-cross frames have a non-compact (flat or near-flat top tube) frame design for easier shouldering. Some design features have recently begun to change, for example, a heightened bottom bracket was typical 10+ years ago; now many cyclo-cross-specific frames do not have elevated bottom brackets, in fact many have a lower bottom bracket than road racing bicycles; this is favorable since the lower seat height makes for easier remounting, and a lower center of gravity increases stability. Many cyclo-cross bicycles are now set up with a single chainring and chain "drop" guards. A single chainring setup simplifies mechanics and reduces the chance of the chain derailing on a bumpy course. People who do run a double chain-ring set up on their bicycles generally use a 36–46 gearing. Many professional-level cyclo-cross bikes are set up with deep-section carbon tubular wheels, not for the purpose of aerodynamics, but to keep the wheel from being entrapped in deep sand or mud sections. Tubular tires are used to avoid pinch flats, decrease rolling resistance and increase grip with lower tire pressures. In addition, single speed cyclo-cross bikes are becoming increasingly popular for a variety of reasons, including lower initial cost of setup, ease of use and maintenance, and decreased likelihood of mechanical failure on the course.
Each section of the course typically lasts no longer than a handful of seconds. For example, long climbs are avoided in favour of short, sharp inclines. Sections are generally linked together, or long straights broken up, with tight corners. This not only allows a standard length course to fit in a relatively small area, but also forces competitors to constantly change speed and effort. Accelerating out of corners, then having to decelerate for the next before accelerating again is a common theme.
Obstacles that force a rider to dismount and run with their bike or to "bunny hop" include banks too steep to ride up, steps, sand pits and plank barriers. Besides the start/finish area, these obstacles may be placed anywhere on the course that the race director desires. Several race directors have tried to limit bunny hopping for safety reasons by placing barriers in pairs or in triple (although under UCI rule no more than two barriers can appear in succession). The maximum height for a barrier is 40 cm.
Since outside assistance is allowed, pits are included to provide a consistent area for this to occur. A pit to the right of the course is normal since most riders dismount to their left. In larger events a separate pit lane is featured so only those wishing a new bike or other assistance need enter the lane (this type was debuted at the Zeddam, Netherlands World Cup of January 1999). In some cases pits are provided in two different parts of the course.
Long-format races, in which riders compete cross country also exist. Examples include the Three Peaks Cyclo-Cross, a 61 km race, Barry-Roubaix, and the American UltraCX Championship Series which consists of seven stages ranging from 80 to 115 km.
Also common are steps, barriers, ditches, stairs, steep slopes and very deep mud or sand which all require running while carrying the bicycle.
A more recent development to overcome obstacles such as barriers and sometimes ditches is the bunnyhop, a technique which came to prominence in 1989 when Danny De Bie used it in his successful World Championship run. Bunny hopping has become less popular as a result of race directors seeking to prevent its use by setting up two or three barriers in a row. Skilled riders are still able to hop the obstacles, despite the back to back to back barriers. Many riders, such as Sven Nys, an ex-BMX racer, were known for their technical skill in bunny-hopping over various obstacles.
In 2025 UCI's Sport Director Peter van den Abeele restated the idea.
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