The ChainReactionCycles.com Quebrantahuesos is held in June every year, with the start and finish line in the town of Sabiñánigo (Huesca). The event includes two non-competitive cyclosportive events:

• The Quebrantahuesos Gran Fondo is the main event. The event has been running since 1990 and it’s positioned as the best Gran Fondo in Spain (noncompetitive and long distance). With a total distance of 200 kilometers, the route winds through the Aragon and French Pyrenees, and it includes four mountain passes, with some historic ones from the Tour de France, such as the climb to Marie Blanque.
• The Treparriscos Medio Fondo has been running since 2003. It’s a Medio Fondo cyclosportive (middle distance) with a route of 85 kilometers within Spanish territory, and it includes one mountain pass. 

The event attracts more than 10,000 cyclists every year with participants coming from 23 different countries. Participating countries include: Germany, Andorra, Argentina, Belgium, Brazil, Chile, Colombia, Denmark, Slovakia, Spain, France, Holland, Ireland, Italy, Norway, Panama, Poland, Portugal, United Kingdom, Romania, Sweden and Switzerland. 

As the course of both events goes through highly valuable natural environments, as well as for the safety of the participants, the number of participating riders is restricted. For this reason, and given the high demand of applications to register for both events, each year there is a raffle for the available places.