As one of the few manufacturers who does so, NG Brakes provides a KBA (Federal Motor Transport Authority - Germany) certificate with all brake discs, so they may be used on public roads. KBA (Federal Motor Transport Authority - Germany) certificate is supplied with each disc. The OEM version is completely equivalent to the original brake disc dimensions. However, the design may vary on some models. Street legal: Yes. Outer diameter: 230mm. Internal diameter. Mounting: 86mm. Thickness: 3.5mm. Bolt holes: 6. Bolt hole diameter: 6.5mm. Type: Standard vehicle fitment for brake disc NG390 TM E 125/ GS 125/ MC 125/ MX 125/ XC 125 1990-1992 (front) YAMAHA DT 125 1984-1987 (front) DT 125/ DT 125 R 1988-2007 (front) DTZ 125 Tenere 1989-1994 (front) WR 125 1989-1990 (front) YZ 125 1988-1989 (front) DT 200 1989 (front) TT 350 1985-1995 (front) YZ 360 1989 (front) YZ 490 1988 (front) WR 500 Z 1992-1993 (front) TT 600 1989-1992 (front) TT 600 N 1985-1988 (front) TT 600 R 1984-1992 (front) TT 600 W 1989-1992 (front)