The smell of burning rubber

Started on my first soon to be rain tire.  There is an art to this, just takes a little practice.  I have a pattern that I made so all I have to do is measure and scribe with a yellow marker.   The tire grooving iron heats the rubber as you carve out the groove.  It does stink.  

Much easier to work with the tire mount on the car.

So far not to bad.

The most difficult part is to cut the correct line, not all get cut.

Should finish this one today.