AMA Motocross
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The AMA Motocross Championship (commercially known as Pro Motocross Championship) is an American
motorcycle racing The motorcycle sport of racing (also called moto racing and motorbike racing) includes motorcycle road racing and off-road racing, both either on circuits or open courses, and track racing. Other categories include hill climbs, drag racing and ...
series. The
motocross Motocross is a form of off-road motorcycle racing held on enclosed off-road circuits. The sport evolved from motorcycle trials competitions held in the United Kingdom. History Motocross first evolved in Britain from motorcycle trials competi ...
race series was founded and sanctioned by the
American Motorcyclist Association The American Motorcyclist Association (AMA) is an American nonprofit organization of more than 200,000 motorcyclists that organizes numerous motorcycling activities and campaigns for motorcyclists' legal rights. Its motto, mission statement is "t ...
(AMA) in 1972. The series is the major outdoor motocross series in the United States and is sanctioned by AMA Pro Racing and managed by MX Sports Pro Racing. With respect to the
MXGP The FIM Motocross World Championship is the premier championship of motocross racing, organized by the Fédération Internationale de Motocyclisme (FIM), divided into two distinct classes: MXGP and MX2. Race duration is 30 minutes plus two laps ...
holding the discipline's worldwide title, and the advent of the FIM Supercross World Championship resulting in the
AMA Supercross Championship The AMA Supercross Championship (commercially known as Monster Energy AMA Supercross) is an American motorcycle racing series. Founded by the American Motorcyclist Association (AMA) in 1974, the AMA Supercross Championship races are held from ...
losing its world title status, the two series will form the
SuperMotocross World Championship The SuperMotocross World Championship (official name as AMA SuperMotocross Championship) is the premier combined discipline of American off-road motorcycle racing. Conceived in 2023 after the AMA Supercross Championship lost its FIM World Champ ...
from 2023.


Series history

The series began in 1972 with the introduction of two classes based on 500 cc and 250 cc engine displacement formulas. A 125 cc class was added in 1974. As motocross technology developed, 500 cc
two-stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft in contrast to a four-stroke engine which re ...
motocross bikes became too powerful for the average rider and, faced with diminishing numbers of competitors, the AMA discontinued the 500 cc class after the 1993 season. A women's national championship series was introduced in 1996. Facing tightening federal emissions regulations in the United States, the A.M.A. increased the allowable displacement capacity for
four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...
engines in 1997, in an effort to encourage manufacturers to develop environmentally friendlier four-stroke machines. Due to the low relative power output of
four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...
engines, compared to the then-dominating two stroke design, the AMA had increased the allowable displacement capacity for four-strokes. By 1994, the displacement limit of a four-stroke power motocross bike was up to 550 cc in the 250 class, to incentivize manufactures to further develop the design for use in motocross. In 2006, the 250 cc division was renamed the MX Class, with an engine formula allowing for 150–250 cc two-stroke or 250–450 cc four-stroke machines. The 125 cc class was renamed the MX Lites Class, allowing 0–125 cc two-stroke or 150–250 cc four-stroke engines. In 2009, the MX class was renamed the 450MX Class and the MX Lites Class was renamed the 250MX Class, to reflect the fact that all the competing manufacturers had adopted four-stroke machinery.


National champions

References:


Most wins by rider

Source: ; Most Championships ; Most overall wins Riders in bold have competed in the 2025 Pro Motocross championship † next to rider's name in the 250/125 Class column indicates rider has competed in the 2025 450 Pro Motocross championship


Venues


Television coverage


Current

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,
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and
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. ''Source:''


AMA Supercross

In the 1970s, promoters such as Bill France started bringing motocross races in from the country to stadiums within cities. Instead of being built upon natural terrain, dirt was imported into the stadiums where promoters tried to emulate the motocross tracks. In 1972 Mike Goodwin and Terry Tiernan, the president of the AMA, put on one of these stadium races in the Los Angeles Coliseum. The race was dubbed as the Super Bowl of Motocross. Eventually this form of racing evolved into its own sport and series with the name Supercross which was a shortening of the original "Super Bowl of Motocross". American motocross racing distinguished itself from European motocross by having two different season championships run each year for each class both sanctioned by the AMA. Currently the AMA runs their 17-round Supercross championship from the first weekend in January to the first weekend in May and then the 11-round outdoor Motocross championship from mid-May through late August. Whereas AMA Motocross is two 30-minute plus 2 lap per each round with the winner being the rider with the highest combined points total for the two motos, in Supercross there is only one points-paying race per round. Around 40 riders qualify for each Supercross round. Heat races and LCQs are used to bring the field down to 22 riders for a points-paying main event for each round. A main event is 20 minutes plus 1 lap for the 450 class and 15 minutes plus 1 lap for the 250 class. There is no 250 Supercross national champion like there is for motocross. The 250 class in Supercross is split into East and West divisional rounds with an All Star race combining the top riders of each division at the final round in Las Vegas.


AMA Motocross and Supercross champions


Rookie season champions

* 2023: Jett Lawrence claimed the 450 class Motocross championship in his rookie year and became the only rookie with 19 years old to go undefeated in his inaugural title campaign, he also won the supercross championship in his rookie year. * 2021: Dylan Ferrandis claimed the 450 class Motocross championship in his rookie year. * 2014: Ken Roczen claimed the 450 class Motocross championship in his rookie year. * 2010: Ryan Dungey became the first rider to capture both the Supercross and Motocross titles in his rookie year. * 2002: James Stewart claimed the 125(250cc) class Motocross Championship in his rookie year. *2000: Ricky Carmichael claimed the 250 class Motocross championship in his rookie year. * 1993: Mcgrath won the Supercross title as a rookie.


See also

*
List of Trans-AMA motocross champions The following is a list of Trans-AMA Champions, from 1970 to 1978. The championship was an international series established by the American Motorcyclist Association as a pilot event to help establish motocross in the United States. The series was ...


Notes

McGrath raced his rookie Supercross season in the 250 class and dropped back to the 125 class for the outdoor Motocross season.


References


External links


AMA Pro Racing official websiteMX Sports Pro Racing official website
{{National Motocross Championships American Motorcyclist Association Motocross Motorcycle off-road racing series