You probably could if they were steel or if they were on a lathe or CNC milling machine. But doing so would probably weaken the wheel a bit. On our farm we have a wagon and all the wheels have had the center torched out to fit over the bearing on the wagon. When I took one tire and wheel to a place to get mounted, the guy looked at me funny and started joking around. Apparently they like to use the torch whenever they can <img src="/forums/images/graemlins/evil.gif" alt="" /> . BUt they were cool about it. But unless you bore out the centers carefully and precisely, the tire may be all but impossible to balance.

Dan