Okay guys I dont have many pics but I can at least explain how its done with just a router. I did this a few months ago and didnt think DIY but yall will get the point.
Items needed:
Router
1/2" Flush Mount Router bit
and of course H2 Wheels
Here is a pic of my H2 wheels before the process, the H2's are slightly smaller and will not fit our hubs. However they are only aluminum and you can route them in about 2 minutes.
I know its hard but you can see a ridge running around the inside hub area this part is raised and on the outside of the wheel there is a small flat area.
Place your router on the inside of the wheel with the wheel laying flat and set the depth of the router bit to meet the outside of the wheel where the small flat area is. The bearing on the router bit should ride along the small flat area once it is milled down.
Fire up the router go slow and determine your speed setting, I have the Dewalt and it worked great on 3. You will want to move in a counterclockwise motion around the center of the wheel. At first it will be very uneven but once the bearing on the bit makes contact with the flat area it will be a perfect circle and you are done. By eliminating teh ridge area you get the exact meaurement you need to fit our hubs and I believe it is something like 3.774 but dont hold me to it.
One bit cost me $17 and I purchased a good one and after doing 5 wheels with it it is still good all in all the result was perfect it looks like a machine shop did it at a third of the cost and I did it with the tires on. Hopefully this helps but feel free to ask any questions as I am not good at explaining things.
Below is the completed wheel as you can see perfectly flat