original tread depth?

I'm guessing 10/32nds (OEM S33D)

Interesting how TR and Yokohama don't have the thread depth listed, but the S33B (diff thread pattern though) has 10/32nd, but that's usually the standard thread depth on new tires.

 

I also aware that recently tires besides OEM also have reduced tread depth to 10/32".
Back in the 80', tread depth are anywhere from 13/32" to 11/32".

 

Look up the specifications of your tires here Tire Rack - Your performance experts for tires and wheels

They will most likely be 10/32 as previously stated.

 

Anyone that has actually measured the original tread depth on the Yokohama Avid S33 D? I am interested in finding out as well. I called a couple of stores in town and they said they are at 10/32 but when I went to check they had looked at an Yokohama Avid tire different from the S33 D and they don't have the S33 D in stock.

 

Just called Yokohama USA Consumer Affairs at the number listed here:
Yokohama Tire
and the representative told me the original tread depth is actually 11/32. The tires on my Prius have ~ 21,000 almost exclusively highway miles and the tread depth reading is 6.5/32. Which translates to 4,666 miles for every 1/32 which means one should see about 42,000 miles out of the tires if driven on highway exclusively.

 

Oddly enough, it doesn't. And Yokohama's tire site doesn't show the Avid A33D.

 

I did measure the tread depth of the original new Yokohama Avid S33D tires and it was 10/32". I always measure the tread depth of the tires and the PH of the coolant on my new cars at purchase to establish a baseline.