Originally Posted By: SrDriver
Several years ago it was common practice to use a cutting device that would cut new tread on tires. As long as one did not cut into the cords this worked OK.
Many used car places did this to sell cars with better looking tires.
Don't know if it is still done or not?
This is not allowed per DOT unless the tire is specifically indicated as regrooveable, which are designed with extra tread depth to allow the practice. There are numerous other limitations as to where on the vehicle, and on what vehicles one can operate re-grooved tires.
I can tell you from personal practice that re-grooving even a regrooveable tire is a black art. Not everyone knows how to do it correctly/safely. It's not enough to not hit cord. When not done right, a forensic tire expert is usually brought in after the resulting accident.