Triumph 765cc engines will continue to power the Moto2 World Championship for a further three seasons.

The three-cylinder powerplants took over from the previous 600cc Honda engine supply in 2019, coinciding with the introduction of a more advanced Magneti Marelli ECU featuring torque maps, engine braking and launch control (but not traction control).

The Triumph contract extension was officially announced on the eve of the factory's home British Grand Prix at Silverstone.

"It's been a success for Triumph in every dimension, and we're committed to developing the performance of the 765 triple Moto2 engine and we have improvements planned for 2022 and 2023," said Steve Sargent, Triumph CPO.

"We hope you'll continue to see the breaking of more lap records and top speeds, and to continue to see Moto2 as the exciting racing spectacle it truly is."

The intermediate grand prix class featured 250cc two-stroke from 1949 to 2009, with Honda then chosen as the exclusive engine supplier for the new look Moto2 four-stroke class in 2010.

Dunlop is the single tyre supplier and while there are no restrictions on chassis competition, the grid is currently dominated by Kalex (22 entries). Boscoscuro (formerly Speed Up) supplies four riders, plus two entries each for NTS and MV Agusta chassis.

The last time a chassis other than Kalex won the Moto2 riders' title was when Marc Marquez triumphed on a Suter in 2012.