The men's road race, a part of the cycling events at the 2008 Summer Olympics, took place on August 9 at the Urban Road Cycling Course in Beijing. It started at 11:00 China Standard Time (UTC+8), and was scheduled to last until 17:30 later that day. The course ran north across the heart of the Beijing metropolitan area, passing such landmarks as the Temple of Heaven, the Great Hall of the People, Tiananmen Square and the Beijing National Stadium. After rolling over relatively flat terrain for north of the Beijing city center, the route entered a decisive circuit encompassing seven loops on a section up and down the Badaling Pass, including ramps as steep as a 10 percent gradient.

The race was won by the Spanish rider Samuel Sánchez in 6 hours, 23 minutes, 49 seconds, after a six-man breakaway group contested a sprint finish. It was the first medal in the men's individual road race for Spain. Davide Rebellin of Italy and Fabian Cancellara of Switzerland, finishing second and third place with the same time as Sánchez, received silver and bronze medals respectively for the event. The hot and humid conditions were in sharp contrast to the heavy rain weathered in the women's road race the following day.

The event was one of the earliest to be concluded at the 2008 Summer Olympics, taking place on the first day of competition. Concerns were raised before the Olympics about the threat of pollution in endurance sports, but no major problems were apparent in the race.

In April 2009, it was announced that Rebellin had tested positive for Continuous erythropoietin receptor activator (CERA, a third-generation form of erythropoietin) during the Olympics. After his B-sample subsequently confirmed initial results, he returned his medal and repaid the prize money he had won from the Italian National Olympic Committee (CONI) while still maintaining his innocence. Cancellara and original fourth-place finisher Alexandr Kolobnev were later awarded new medals corresponding to their updated finishing positions. Kolobnev's bronze was Russia's first medal in the event.

Qualification

Qualification for the race was restricted to five athletes per National Olympic Committee (NOC), providing that these athletes qualified through the Union Cycliste Internationale (UCI) rankings, with the UCI ProTour considered to be superior to the UCI Continental Circuits. The number of qualification places allocated varied among the different UCI tours, which all maintain their own ranking system. Any NOC unable to fill its quota of athletes from the ProTour was permitted to enter athletes from one of the continental tours, and if that was not feasible, from the "B" World Championship. The number of places allocated to each tour were thus (in descending order): 70 riders from the ProTour, 38 from the Europe tour, 15 from the America tour, nine from the Asia tour, five from the Africa tour, and three from the Oceania tour. Five entrants qualified through the "B" World Championships.

The final number of competitors was set to be 145, but only 143 athletes started the race. Four cyclists were scratched from the race shortly before it took place. Damiano Cunego of Italy had not yet recovered from the injuries he sustained in the 2008 Tour de France, so he was replaced by Vincenzo Nibali. Portugal's Sérgio Paulinho, the silver medalist at the 2004 event, was said to be in insufficient shape to race. After Russian Vladimir Gusev was fired by his professional team for failing an internal doping check, he was replaced in this event by Denis Menchov, who later competed in the time trial. While training earlier in the week before the race, Switzerland's Michael Albasini crashed and broke his collarbone; there was not sufficient time to find a replacement for him.

Preview This was the 18th appearance of the event, previously held in 1896 and then at every Summer Olympics since 1936. It replaced the individual time trial event that had been held from 1912 to 1932; the time trial had been re-introduced in 1996 alongside the road race.

Pollution issues Prior to the opening of the Games, the International Olympic Committee was keen to play down the risk that athletes faced from pollution; however, the organizing body considered rescheduling of endurance events (such as the cycling road race) if the pollution levels were too high. Athletes partaking in these events can consume 20 times the amount of oxygen as a sedentary person. A higher level of pollution in the air could adversely affect performance, damage or irritate an athlete's lungs, or exacerbate respiratory conditions, such as asthma.

Independent sources showed that pollution levels were above the limit deemed safe by the World Health Organization on August 9. However, the cycling event went ahead as scheduled with no objections from the athletes. Fifty-three of the 143 cyclists pulled out during the race; however, this is not unusual (over half withdrew mid-race at the 2004 Summer Olympics). Post-race, a number of riders highlighted the punishing conditions, in particular the heat () and humidity (90%), which were much higher than in Europe, where the majority of UCI ProTour races are held. Pollution, however, was not widely cited as a problem, though Stefan Schumacher of Germany, who had been considered an outside favorite for victory in the event, said the elements and the pollution played a role in his withdrawal.

Pre-race favorites

Among the pre-race favorites was the entire Spanish contingent of riders. It included two winners of Grand Tours in Alberto Contador and Carlos Sastre, along with highly regarded countrymen Alejandro Valverde, winner of the 2008 Critérium du Dauphiné Libéré and the reigning Spanish national road race champion, and Samuel Sánchez, who had won three stages in the 2007 Vuelta a España. They also had 2008 Tour de France points classification winner and three-time world champion Óscar Freire available to work on their behalf. Valverde was seen as the strongest threat among the Spaniards. Other medal hopefuls included the defending Olympic champion Paolo Bettini of Italy, Germany's Stefan Schumacher, and Australian Cadel Evans, twice a runner-up in the Tour de France (2007 and 2008). It was thought that members of the overall strong squads from Germany and Luxembourg could also contend for victory. The German team contained Schumacher and many veterans of Grand Tours such as Jens Voigt to work in support, while Luxembourg had the Schleck brothers Andy and Fränk, along with Kim Kirchen, all of whom had worn leader's jerseys during the 2008 Tour de France.

Course The Urban Road Cycling Course (one of Beijing's nine temporary venues) was in its entirety, and the men's race was a distance of , the longest in Olympic history. The race's starting line was located at the Yongdingmen, a reconstructed gate of Beijing's old city wall, which is a part of the Dongcheng District south of Beijing city center. The course ended at the Juyong Pass in the Changping District.

The route passed through a total of eight districts: Chongwen, Xuanwu, Dongcheng, Xicheng, Chaoyang, Haidian, Changping, and Yanqing. The course's scenery, described by The Guardian newspaper (UK) as "visually sumptuous", included landmarks such as the Temple of Heaven, the Great Hall of the People, Tiananmen Square, the Yonghe Temple, and sections of the Great Wall of China, which were passed through as the course journeyed from urban Beijing into the countryside. It also passed the architecture of the 2008 Olympics, including the Beijing National Stadium and Beijing National Aquatics Center (known colloquially as the "Bird's Nest" and "Water Cube").

The men's race layout, which differed most significantly from the women's in that it was over double its length, saw the riders make seven loops back-and-forth between the Badaling and Juyong Passes. The early sections of the race took place within central Beijing; consequently, the gradient of this part of the race was relatively flat. At approximately the point in the race the riders reached the Badaling section of the Great Wall, and began their first of seven loops. The riders encountered an increase in the gradient at this point, with the Badaling Pass gaining in elevation over a distance of from the start of the circuit to the highest point. From there the cyclists rode over a false flat before descending a highway towards the Juyong Pass. The final of the race gave the riders a moderately steep climb to contend with, which was designed to ensure an exciting finale should several riders have been grouped together at the end of the race, as there were.

Due to security regulations put in place by the Olympic organizers, no spectators were permitted to stand roadside along the course. This decision proved to be controversial: several prominent figures in cycling, including UCI president Pat McQuaid and riders Stuart O'Grady and Cadel Evans (both Australia), spoke out against it. McQuaid and O'Grady both felt that the absence of people along the course deprived the race of the atmosphere present at other cycling events, and said that it failed to take supporters' wishes into consideration. Cycling Australia's reaction to the cyclists' complaints was to request that security restrictions be eased for the time trial to follow, but they were not.

Race The men's road race began at 11:00 local time (UTC+8) and within of the start, Horacio Gallardo (Bolivia) and Patricio Almonacid (Chile) formed a two-man breakaway. They held a maximum advantage of 15 minutes, but were never really seen as a threat, and in fact neither went on to finish the race. With no single team willing to force the pace, a 26-man breakaway formed at the mark, including Carlos Sastre (Spain), Kim Kirchen (Luxembourg), Jens Voigt (Germany), Roman Kreuziger (Czech Republic) and Simon Gerrans (Australia). Shortly after the race reached the finish line to begin the first of seven loops, Gallardo was dropped by Almonacid. The lone Chilean leader was then caught by the now 24-man chase group at the summit on the second loop, after riding solo ahead of the pack for over an hour and a half.

Under the impetus of Sastre and Kreuziger in particular, the 24-strong breakaway group built their lead to over six minutes at the half-way point of the race, after four of the seven circuits. At that point, the Italian-paced main field increased its speed in order to bring them back. Aleksandr Kuschynski (Belarus) and Ruslan Pidgornyy (Ukraine) went clear of the leading group afterward and gained an advantage of a minute and 40 seconds over the Sastre group and 2 minutes, 45 seconds over the main field by the start of the fifth lap over the hilly circuit. The Sastre group was absorbed by the main field at the to go mark, leaving just Kuschynski and Pidgornyy out front. Not long after, shortly before the end of the fifth circuit, Marcus Ljungqvist (Sweden), Rigoberto Urán (Colombia) and Johan Van Summeren (Belgium) attacked from the peloton and reeled in Kuschynski and Pidgornyy.