So I got some 2011 street glide wheels. I'm going to update this thread as I make progress. I'm putting a Harley 18inch wheel up front. Here are some rough measurements, comparing the 2 rims in reference to the calipers. Pics below. It turns out the Harley rotors are within 1mm of the 2003 roadstar.
6-3/4 Harley outside rotor to outside.
11-3/4 Harley rotor .
7-3/8 Yamaha outside rotor to out.
11-3/4 Yamaha rotor.
So the roadstar calipers are set too wide by a total of 5/8" divide in half is 5/16 per side. So I need to put 2- 5/16" spacers between the 2 caliper mounting bolts (I will need 4 longer bolts to do this to both sides) . This will put the calipers in line with the Harley rotors.
I'm going to figure the spacers and adapters for the front shaft.
If you are planning this, get rims with 1inch bearing and the 1inch spacer that is between the inside of the 2 bearings.