I saw an article on the HAMB about cutting your own whitewalls.
Actually, it was a YOU-TUBE demonstration.
To start, you need tires with raised white letters.
You can probably guess the rest.
I tried it on an old junk tire i had laying around,,seems to work.
There was lots of people busting veins in their forehead saying
"OH GOD,DONT GRIND ON THE SIDE OF YOUR TIRE".
,,Watch the video,then you decide.