Standard 215-60-R15 tires can be replaced with 215-50-R17 tires by first installing new rims. The vehicle may need to be raised with a suspension lift kit to achieve sufficient clearance.
Yes. Your 205 tires will be 0.5 cm narrower and 0.085 cm greater overall diameter. This may cause a minor loss of traction, but in a pinch it'll work.
21560r15
No the rim and tire are too big.
Yes, they can
Yes, they can
It depends on the use, but yes, they have to be replaced periodically.
Yes. Not only can, but should be.
Yes, if you also change wheels.
Yes. can i install traditional tires on run-flat rims?
Tires have molded indicators called "wear bars." If these are visible across the tread pattern, your tires need to be replaced.
no
First you should use a search with the term tires. Secondly research some of the manufactures such as Firestone and Goodyear. I have had my tires replaced at Tires Plus and would highly recommend it.