R 1100 RT ABS 1994-2001. R 1100 RT 1994-2001. R 850 RT Integral ABS 2001-2004. R 1100 GS 1994-2001. R 850 RT 1995-2001. -- The shape of the disc ensures good heat dissipation under heavy braking sessions, reducing brake fade, minimizing warping, and ensuring rotor longevity.