There are 2 types of runflat tires on the market today:
1: Self supporting
2: Auxiliary supported
This is the most common type of runflat in the market, which features a stiffer sidewall and is capable of carrying the weight of the car after it has lost all of its air. Usually the tire can go up to 50 miles at speeds of up to 55 mph. Its important for you to know that all manufacturers call their runflat (rft by different names ….below is a list)
Goodyear..emt (extended mobility technology and rof (run on flat)
Michelin…..zp (zero pressure)
Bridgestone…rft (run flat tire)
Dunlop …dsst (dunlop self supporting tech and rof (run on flat)
Firestone…rft (run flat tire)
Pirelli rft… (run flat technology)
Yokohama…rft and zps (zero pressure system)
This system relies on special wheels with inserts to support the tire when it loses its air. A self supporting runflat above will not fit on these wheels and these wheels only accept a tire that is designated for the wheel the only tire I know that exists is the Michelin pax system. This system because of the special wheel which is more expensive than the self supporting runflat.
Runflats generally get between 8000-20,000 miles of life and are twice as expensive as a regular tire because they have reinforced sidewalls.
They are heavier than a tire the same size and build up more heat when driven ….hence wearing out faster.
Note…in our system we only use rft to designate runflat tires that we stock in order to cut the confusion as to the many names it is called by the different manufactures.