KTM SM T 990 (FROM 2009 TO 2013). FLOATTING FRONT BRAKE DISC WAVE Ø305 mm BRAKING SK2. WAVE and "DIRECTIONAL" Brake Disc (each side has its own sense of installation) hardened stainless steel. After 5 years of successful results and 7 winning world titles, Braking launches the second generation of their SK.