"Sonic Riders (ソニックライダーズ Sonikku Raidāzu) is a racing video game spin-off produced by Sega and developed by Sonic Team in cooperation with NowPro, for the Nintendo GameCube, PlayStation 2, Xbox and PC. It is the fourth racing game in the Sonic the Hedgehog series, preceded by Sonic Drift, Sonic Drift 2 and Sonic R.
A sequel to Sonic Riders, entitled Sonic Riders: Zero Gravity, was released in 2008 for the Wii and PlayStation 2. A third title, Sonic Free Riders, developed by O-Two, has been revealed as a launch title for Xbox 360's Kinect peripheral.
Source: Wikipedia, "Sonic_Riders", available under the CC-BY-SA License.