There has already been a Sonic Riders 3. It's called Sonic Free Riders.
Most likely no.
Sonic Riders Extreme is an unconfirmed game at this stage.
No one knows if there will be a Sonic Riders 4.
It is not known as of yet if there will be another game in the Sonic Riders series.
So far there has been 3 Sonic Rider games: Sonic Riders was released 2006. Sonic Riders ZG (Zero Gravity) was part 2 and released 2007 and part 3 was Sonic Free Riders released 2011. In future there might be more coming. And to answer your question the first Sonic Riders had no full name.
It is unknown if there is going to be a Sonic Riders 4.
maybe but not that name
Sonic Free Riders is the third instalment in the Sonic Riders series.
Sonic colors and sonic free riders
Sonic Riders Fire Winds is fanmade, but Sonic Free Riders will be coming out for the Xbox 360 and will use kinect; the new motion camera. It is coming out in the holidays 2010.
sonic Rider Zero Gravity noob
Sonic Free Riders is the third instalment.