Take a look at this, folks!
Video:
http://www.tirerack.com/tires/...d.jsp
Written Results:
http://www.tirerack.com/tires/...id=85
While not always successful, I generally try to change my tires when they reach 3/32" to 4/32" tread depth, and this link shows why it makes a lot of sense to do just that!
On the few occasions that I have let it go till 2/32" (or maybe even a teensy bit less ), it has been with less than acceptable results. One time, my Bridgestone RE940's had a belt failure on the inside edge of the tire ... at a low enough speed (just leaving the house, before getting on to the highway) that I did not end up in an accident fortunately.
This last time, I let it get down to 2/32" since it had not started raining in the Bay Area - at least not much. But, the Winter rains are now here, so I made sure to get my new tires installed last Wednesday ... before driving to Thanksgiving dinner at my cousins place. With my family in the car!
Be safe on the roads, folks! Tires are where the driving experience all comes together and skimping on quality tires is simply not a good idea.
Z