Tire wear sensors?

I'm new to this site and i don't want to offend anyone. I'm just wondering if someone can tell where to find the sensor that tells me that i need new tires. Thank you.

 

This

 

LOL!

That's it.

 

There isn't a tire wear sensor. IMO the two most common reasons tires can need to be replaced are from either excessive wear or dry rot (cracking). If you can't tell if they need to be replaced it may be best to consult a professional. Here's a video that talks about checking for tire wear using the "wear bars."

http://www.ehow.com/video_2327609_check-car-tire-wear.html