Easy black and white 'street tire' designation could be treadwear. Stamped on the sidewall of every street tire I know so you can check, under 180 treadwear, you're out. Anything above, in like Flynn.
If a tire has tread or hasn't will always be debatable.
NT01 is a "treaded" DOT legal "street tire" but you're not going to daily drive a car on a set of tires with a 100 treadwear rating.
I think 180 or 200+ would be a good minimum treadwear limit.
Just my .02
__________________
-LC
|