Light speed ring dash

[GranTurismoStig]

In the manual it says this is operated by pressing the triangle button the PS3 controller, but I can't seem to get it to work. Is this skill one that Sonic has to learn, and if so, at what point are you able to gain this technique?

Thanks.

[corneliab]

You'll acquire the item that lets you use it when you reach Shamar's Entrance Stage.

It's a little ways into the game.