My agility 50 tire was still stock when I bought it (it was a 2012 or 2013, I got it in april 2017). And worn a little bit, I just drove it, drove over some glass, plugged it and refilled it, and kept driving it until I sold it.
I got it ridiculously cheap (the owner couldn’t figure out what was wrong, carb needed cleaning and it needed a ever so slightly higher idle speed) and didn’t plan on having it forever, so a ~80$ tire wasn’t really worth it, unless something went wrong.
Ended up selling it for quite a bit more than I bought it for.