Originally Posted by twintwin
Nope, different mounting points on the calipers and forks. I have a 04 R1150GSA and a couple R1100GS and no way you can put the 1100 calipers on the GSA and vis versa. If interested I can take picture and measurements of both, let me know.
Maybe the 1150 forks changed. The forks I have from a 2000 1150 are definitely different styling from the 1100 forks but the calipers are definitely the same (I was wrong about the "Brembo v's "BMW" - both sets of calipers are marked "Brembo".)