If I recall correctly, NT05s don't come in 19s.
I got about 7500 miles out of my first set of front tires, 200 autox runs and 8 track days or so. The rears were at a little over 2/32nd at the same time
I have about 7000 miles on my second set. Fronts have about 3-4 /32nd and rears have slightly more. They do have less autox (125) and track time (4) while more street driving.
You wear your fronts quicker if you do a lot of street driving or you spend a lot of time understeering.
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