2017 Moto3 champion Joan Mir moved up to Moto2 with EG 0,0 Marc VDS, filling the spot vacated by reigning Moto2 champion Franco Morbidelli who moved up to MotoGP.
Romano Fenati moved up to Moto2 along with his Moto3 team Marinelli Rivacold Snipers for the 2018 season.
Danny Kent made his full-time Moto2 return in 2018 after leaving Kiefer Racing early in the 2017 season, joining Speed Up Racing as a replacement for Simone Corsi who switched team to Tasca Racing Scuderia Moto2.
2017 CEV Moto2 winnerEric Granado returned to Moto2, joining Forward Racing as a replacement for Lorenzo Baldassarri. Granado previously made some Moto2 appearances in the 2012 season.
Zulfahmi Khairuddin moved from World Supersport to Moto2, rejoining the SIC Racing Team, who he previously rode for in Moto3 in 2015. He replaces the previously announced new signing Hafizh Syahrin, who moved up to MotoGP with Tech 3 to replace Jonas Folger.
Zulfahmi Khairuddin left SIC Racing Team after the Jerez Grand Prix due to bad results. He was replaced by Niki Tuuli from the French Grand Prix onwards, who left the Supersport World Championship to join SIC Racing Team for the remainder of the season.
Héctor Barberá left Pons HP40 after his contract was terminated by mutual agreement due to drunk driving. He was replaced by Augusto Fernández for the remainder of the season.
Eric Granado left Forward Racing after the Czech Republic motorcycle Grand Prix. He was replaced by Isaac Viñales from the Austrian Grand Prix onwards, who left the SAG Team to join Forward Racing for the remainder of the season.
At the San Marino Grand Prix, Romano Fenati received a 2-race ban following a very controversial incident where Fenati grabbed Stefano Manzi's brake lever at speed in retaliation for Manzi pushing him wide earlier during the race. The following day, Marinelli Rivacold Snipers announced that they terminated Fenati's contract as a result of the incident. Xavi Cardelús would replaced Fenati in the team for the remainder of the season.
Danny Kent was fired from Speed Up after the Aragon Grand Prix due to ongoing bad results. Edgar Pons would become his replacement for the remainder of the season.
NTS made their full season debut in Moto2, having previously competed as a wildcard constructor between the 2014 and 2017 seasons. They will field bikes for RW Racing GP, who switched manufacturer from Kalex to NTS. RW Racing GP also expands its operation to field two bikes for the 2018 season.
Forward Racing Team and Dynavolt Intact GP switched manufacturers. Forward returned to Suter, with which they last competed in 2012, while Intact GP returned to Kalex after one season with Suter.
Tasca Racing Scuderia Moto2 expanded to two bikes in 2018.
Both CGBM Evolution and Kiefer Racing switched manufacturers from Kalex and Suter to KTM.
Marinelli Rivacold Snipers expanded to Moto2, fielding a Kalex bike.
AGR Team folded its operations in both Moto2 and Moto3 following the 2017 Aragon GP due to financial issues coupled with poor performance throughout the 2017 season.
Petronas and the Sepang International Circuit will form a partnership which will enable the SIC Racing Team to return to Moto2, having previously competed in the championship in 2014 as "Caterham Moto Racing Team".
Kiefer Racing downsized to one bike in 2018 due to financial issues. Sandro Cortese, who was originally contracted to ride the team's second bike, was later released as a result.
Calendar
The following Grands Prix were scheduled to take place in 2018:
The British Grand Prix was scheduled to move from Silverstone to the new Circuit of Wales, but construction on the new track has not commenced. The two circuits reached a deal that will see Silverstone with an option to host the 2018 race.
The Thailand Grand Prix is a new addition to the calendar, with the race scheduled for 7 October.
The Catalan Grand Prix used a new configuration of the Circuit de Barcelona-Catalunya, wherein the previous set of corners of turns 13, 14 and 15 was combined into a sweeping right corner. The new layout was previously used in Formula 1 from 2004 to 2006.
Results and standings
Grands Prix
Riders' standings
;Scoring system Points are awarded to the top fifteen finishers. A rider has to finish the race to earn points.