I learned the hard way that the 86 1100 forks are machined for 15mm axlesI think the axle size is different on the 87 1100 compared to the 85 750. If it is you'll need to change the bearings in the 750 wheel. There is also a difference in the spring wieght which is actually better for track use. And then there is the electric anti dive which should be blocked off anyway. But as noted above, the better bet is with the Slingshot forks.