Sepang International Circuit was built between 1997 and 1999 as part of a series of large-scale infrastructure projects under Prime Minister Mahathir Mohamad's government, with the dual aim of hosting Formula One and Grand Prix motorcycle racing. The circuit sits approximately 45 km south of Kuala Lumpur, close to Kuala Lumpur International Airport. Hermann Tilke, who would go on to design circuits in Shanghai, Sakhir, Istanbul, Marina Bay, and Yas Marina, created the layout as one of his early major international projects.
The facility was officially inaugurated by Mahathir Mohamad on 7 March 1999. The first MotoGP-class Malaysian Grand Prix followed on 20 April 1999, establishing Sepang as a motorcycle racing venue from its opening year.
The main circuit runs clockwise over 5.543 km and is characterized by wide straights measuring between 16 and 22 metres, sweeping medium- and high-speed corners, and an unusual configuration in which the long 0.927 km back straight is separated from the pit straight by a single tight hairpin. This layout creates a distinctive rhythm of high-speed sections separated by hard-braking zones.
For motorcycle racing, several corners define the challenge. The opening slow right-hand complex descends on a downhill gradient, making hard-braking entries bumpy and unstable. Turns 5 and 6, locally known as the Genting Curve, form a fast chicane that generates sustained lateral load. Turn 9, a slow uphill left hairpin mirroring the entry complex, demands strong deceleration. Turn 11 requires combined braking and turning, a technique particularly taxing on motorcycle tyres in the intense heat. The back straight and Turn 15 hairpin are the circuit's primary overtaking point in motorcycle racing.
Malaysia's tropical climate makes Sepang an unpredictable venue. The circuit swings between dry conditions with extreme heat and humidity and sudden, intense tropical rainstorms that can dramatically alter race outcomes.
Sepang hosted the Malaysian Motorcycle Grand Prix as a round of the MotoGP World Championship continuously from 1999 until its removal from the calendar. The race became a fixture in the penultimate portion of the season, typically held in October or November, when championship battles were often still unresolved.
In October 2011, during the second lap of the race, Marco Simoncelli was struck by the bikes of Colin Edwards and Valentino Rossi after Simoncelli fell at Turn 11. He died from his injuries later that day. The race was abandoned. The accident prompted renewed attention to circuit safety standards and rider protection at Sepang's fast corners, and it remains the defining tragedy associated with the venue in motorcycle racing.
In 2016 the circuit was completely resurfaced with support from Italian circuit designers Dromo. Several corners were reprofiled to emphasize mechanical grip over aerodynamic dependence. Most notably, the final corner was raised by approximately one metre, which was intended to force riders and drivers to take a later apex and explore different exit lines. The resurfacing work altered the handling characteristics of the circuit significantly for both four-wheel and two-wheel competitors.
In the same year, it emerged that Formula One's Malaysian Grand Prix was at risk of removal from the calendar due to declining ticket sales and rising hosting fees. The nineteenth and final Malaysian Formula One Grand Prix was held in 2017. Motorcycle racing at Sepang continued independently of the Formula One departure.
Sepang International Circuit appears in several simulation titles in its full layout, reflecting its long tenure as one of Asia's primary international circuits. The track's combination of long braking zones, varied corner radii, and a back straight favoring slipstream passes makes it a technically demanding circuit in simulation.
The circuit retains a significant schedule of Asian regional motorsport, including the Malaysian Motorcycle Grand Prix under MotoGP, the Sepang 1000 km endurance race, and various regional touring car and GT championships. The Petronas naming rights deal announced in October 2023 gave the facility its current commercial designation as the Petronas Sepang International Circuit. Sepang remains one of the most complete motorsport facilities in Southeast Asia, with kart racing and motocross facilities supplementing its main track.