The short answer is because they're extremely heavy in comparison with a normal tyre, and they extremely rigid too. Have a search and you'll find loads about runflats!
2006 MINI Cooper with JCW Sound Kit - sold July 2009
Now driving Golf VI GT TSI 1.4 160PS
correct, this along with the density and compound of rubber means that they are slow to warm up, give less grip due to this, and carry the extra weight that Seb mentioned
Stiffer = changes direction faster
Softer = more compliant and more grip
Weight is most evil when its unsprung (i.e. tyres, wheels, brakes, track rods etc.), the car reacts slower when these parts are heavier.
This explains the harsher ride and less grip (runflats being stiff and heavy), but it doesn't explain why I found mine to wear out quicker than normal tyres did. Maybe they're made softer to counteract the lower grip levels?
Statistics are like mini-skirts, they give you a lot of ideas but hide whats important
its also down to the side wall being so strong that causes them to wear faster but compared to some budget non rfs that ive driven on other cars the run flast on the mini aint to bad esp the newer generation ones
minitorque.com, the site for mini performance, drag racing track days & time attack
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