Run Flat New & Used Tires
These things are actually pretty cool. Say you get a nail in your tire or something; if you happen to have Run Flat Tires, it will be resistant to the effects of deflation when the nail & tire come in contact with each other. If it does happen to get punctured, no worries; you’ll be able to travel up to 100-200 miles at 55 MPH! How awesome is that, right?
There are advantages & disadvantages; like always. One major advantage is that you wouldn’t have to carry a spare wheel anymore! Hence, saves you gas since it’s so heavy to carry in your car. The disadvantage is that it can literally deform your tire which will cause it to have a higher percent of rolling resistance. Rolling resistance is, in a nutshell, something very bad that may be very expensive to repair. Instead of your wheel 
rotating with the car like it’s supposed to, it’d be dragging everywhere.
So I guess you can conclude that Run Flat Tires are Specialty Tires that you can find at Used Tire Shops - but you might want to call first to make sure you have them. This can either be a good or bad thing. I think it all depends on how well you drive & how cautious you are of your surroundings; but of course you’re the safest driver in the world, right? That makes 2 of us, plus the rest of the world.
Be safe,
Mykalanne.
