supplied by Bridgestone. † All engines were 3.0 litre, V10 configuration. Team changes The Mecachrome engines used by Williams in were rebadged as Supertec units. After three decades in the sport, the Tyrrell team was sold to British American Tobacco and its entry was used by the new British American Racing (BAR) team, with Supertec engines replacing the Ford-Cosworth units of the previous season. Goodyear, who had supplied Williams, Ferrari, Jordan, Sauber and Tyrrell throughout 1998, left Formula One at the end of the season, temporarily leaving Bridgestone as the only tyre supplier while Formula One sought a competitor. The grooved tyres introduced in 1998 now had four grooves on all tyres; the front tyres previously had three. Wheels also were required to be tethered to the chassis in order to prevent them flying off in a crash, a feature which remains in place as of . Driver changes Williams entered the season with an all-new driver pairing. Ralf Schumacher, who had driven for Jordan in 1998, switched to Williams for the new season, and was partnered with Alessandro Zanardi, whose last stint in Formula One, for Lotus, had ended at the end of the 1994 season. In the meantime, the Italian had won the 1997 and 1998 CART titles for Chip Ganassi Racing. Heinz-Harald Frentzen completed a straight swap with the younger Schumacher, taking the vacant seat at Jordan alongside 1996 champion Damon Hill. Frentzen's 1998 teammate, the 1997 World Drivers' Champion Jacques Villeneuve, moved to the newly founded BAR team, which also utilised a completely new lineup. Villeneuve was partnered with the 1998 McLaren test driver and FIA GT1 champion Ricardo Zonta, one of three rookies on the grid at the beginning of the season. 1998 Tyrrell driver Ricardo Rosset retired from racing after leaving the team at the end of the season, while his teammate, Toranosuke Takagi competed for Arrows in 1999, where he was joined by Jordan's test driver from the previous season, Pedro de la Rosa, who also made his debut at the first race of the season. Pedro Diniz left Arrows to sign for Sauber. Diniz' teammate from 1998, Mika Salo was left without a full-time drive for 1999, but he later served as an injury replacement for both Ricardo Zonta at BAR for three races, and Ferrari's Michael Schumacher for six races, scoring one second place and one third for Ferrari. Johnny Herbert,