Road Racing World Championship Grand Prix is the premier championship of motorcycle road racing. It is currently divided into three classes: MotoGP, Moto2 and Moto3. All three classes use four stroke engines. In 2010, 250 two strokes were replaced by the new Moto2 600 four stroke class. In 2012, 125 two strokes were replaced by the Moto3 250 four stroke class with maximum weight limit 65 with fuel, and the engine capacity for MotoGP increased from 800 to 1,000 Prix motorcycles are purpose built racing machines that are neither available for purchase by the general public nor can be ridden legally on public roads. The commercial rights are now owned by Dorna Sports, with the FIM remaining as the sport sanctioning body. Teams are represented by the International Road Racing Teams Association (IRTA) and manufacturers by the Motorcycle Sport Manufacturers Association (MSMA). Rules and changes to regulations are decided between the four entities, with Dorna casting a tie breaking vote. In cases of technical modifications, the MSMA can unilaterally enact or veto changes by unanimous vote among its members.[1] These 4 entities compose the Grand Prix Commission.

There have traditionally been several races at each event for various classes of motorcycles, based on engine size, and one class for sidecars. Classes for 50 80cc, 125 250 350 and 500 solo machines have existed over time, and 350 and 500 sidecars. Up through the 1950s and most of the 1960s, four stroke engines dominated all classes. In part this was due to rules which allowed a multiplicity of cylinders (thus smaller pistons, thus higher revs) and a multiplicity of gears (thus narrower power bands, thus higher states of tune). In the 1960s, two stroke engines began to take root in the smaller classes. In 1969, the FIM citing high development costs for non works teams brought in new rules restricting all classes to six gears and most to two cylinders (four cylinders in the case of the 350 and 500 classes). This led to a mass walk out of the sport by the previously highly successful Honda, Suzuki and Yamaha manufacturer teams, skewing the results tables for the next several years, with MV Agusta effectively the only works team left in the sport until Yamaha (1973) and Suzuki (1974) returned with new two stroke designs. By this time, two strokes completely eclipsed the four strokes in all classes. In 1979, Honda on its return to GP racing made an attempt to return the four stroke to the top class with the NR500, but this project failed, and in 1983, even Honda was winning with a two stroke 500. The 50 class was replaced by an 80cc class, then the class was dropped entirely in the 1990s, after being dominated primarily by Spanish and Italian Cheap Lions Jerseys makes. The 350 class vanished in the 1980s. Sidecars were dropped from World Championship events in the 1990s (see Superside), reducing the field to 125s, 250s, and 500s.

MotoGP, the premier class of GP motorcycle racing, has changed dramatically in recent years. From the mid 1970s through 2001, the top class of GP racing allowed 500 with a maximum of four cylinders, regardless of whether the engine was a two stroke or four stroke. Consequently, all machines were two strokes, due to the greater power output for a given engine capacity. Some two and three cylinder two stroke 500s were seen, but though they had a minimum weight advantage under the rules, typically attained higher corner speed and could qualify well, they lacked the power of the four cylinder machines. In 2002, rule changes were introduced to facilitate the phasing out of the two strokes, probably influenced by what was then seen as a lack of relevance: the last mass produced 500 two stroke model had not been available to the public for some 15 years.[original research?] The rules permitted manufacturers to choose between running two strokes engines (500 or less) or four strokes (990cc or less). Manufacturers were also permitted to employ their choice of engine configuration. Despite the significantly increased costs involved in running the new four stroke machinery, given their extra 490cc capacity advantage, the four strokes were soon able to dominate their two stroke rivals. As a result, by 2003 no two stroke machines remained in the MotoGP field. The 125 and 250 classes still consist exclusively of two stroke machines. In 2007, the MotoGP class had its maximum engine displacement capacity reduced to 800 for a minimum of 5 years. Exclusive to the MotoGP class, there was also a USA round at Mazda Raceway Laguna Seca in Monterey, California for the 800 class only, this is because the paddock is not large enough to also include the other 2 classes. In 2008 a MotoGP event was held at the Indianapolis Motor Speedway for the first time on a newly prepared track, and observers noted that the Speedway had hosted motorcycle racing before cars raced there. All three classes were scheduled to race but severe wind and rain prevented the 250 class from racing. MotoGP racing at Indianapolis is counterclockwise, with a new Snake Pit complex past the start finish line before heading down the Turn 1 short chute and into the infield section.

The grid is composed of three columns (four for the 125 and 250 classes) and [url=http://www.wholesalecheaplionsjerseys.com/]http://www.wholesalecheaplionsje... contains approximately 20 riders. Grid positions are decided in descending order of qualifying speed, the fastest on the 'pole' or first position. Races last approximately 45 minutes, each race a sprint from start to finish without pitting for fuel or tyres.

In 2005, a flag to flag rule for MotoGP was introduced. Previously, if a race started dry and rain fell, riders or officials could red flag (stop) the race and either restart or resume on 'wet' tyres. Now, if rain falls a white flag is shown, indicating that riders can pit to swap the motorcycle on which they started the race for an identical one, as long as the tyres are different (that is, intermediates instead of wets, or slicks instead of wets)[1]. Besides different tyres, the wet weather bikes have steel brake rotors and different brake pads instead of the carbon discs and pads used on the 'dry' bikes. This is because the carbon brakes need to be very hot to function properly, and the water cools them too much. The suspension is also 'softened' up somewhat for the wet weather.

When a rider crashes, track marshals upstream of the incident wave a yellow flag, prohibiting passing in that area; one corner farther upstream, a stationary yellow flag is shown. Passing in an area of the track covered by a yellow flag is prohibited; if a fallen rider cannot be evacuated safely from the track, the race is red flagged. Motorcycle crashes are usually one of two types: lowside, with the rider initially following his upended bike, and the more dangerous highside, with the rider ejected ahead of the machine. Increased use of traction control has made highsides much less frequent.

According to one estimate, leasing a top level motorcycle for a [url=http://www.wholesalecheaplionsjerseys.com/]wholesalecheaplionsjerseys.com[/... rider costs about 3 to 3.5 million dollars for a racing season.[3]

As a result of the 2008 2009 financial crisis, MotoGP is undergoing changes in an effort to cut costs. Among them are reducing Friday practice sessions; banning active suspension, launch control and ceramic composite brakes; extending the lifespan of engines; and reducing testing sessions.[4]

1949: Start of the world championship in Grand Prix motorcycle racing.

1957: Gilera, Mondial and Moto Guzzi withdraw at the end of the season.

1958: MV Agusta win the constructor's and rider's championships in all 4 solo classes.

1959: MV Agusta retain all eight solo titles. Honda enters the Isle of Man TT for the first time.

1960: MV Agusta retain all 8 championships again.

1962: First year of 50 class.

1966: Honda wins the constructor's championship in all 5 solo classes.

1967: Final year of unrestricted numbers of cylinders and gears.

1968: Giacomo Agostini (MV Agusta) wins both 350 and 500 titles.

1969: As 1968.

1970: As 1968.

1971: As 1968.

1972: As 1968.

1972: Death of Gilberto Parlotti at the Isle of Man TT, multiple world champion Giacomo Agostini and other riders boycott the next 4 events on grounds of safety.

1973: Deaths of Jarno Saarinen and Renzo Pasolini at the Italian round at Monza.

1974: The Suzuki RG500 is the first square 4 in the 500 class.

1976: The FIM gives in to the rider's boycotting of the Isle of Man TT, and the round is taken off the calendar.