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NO, they can not.
Fragmented question?? If you have under 3/32nd's remaining on your tires replace them. If you have wires hanging out of your tires replace them. Replace tires as needed or rather replace all at once if you do not like mis-matched tires. However many people will replace just two tires at a time then rotate when the other two need replacement.
form_title=Replace 4 x 4 tires form_header=If you're tires or wheels are getting old or worn, it's time to replace them. What is the size of your current tires?=_ What type of weather does it drive in mostly?=_ How many tires need to be replaced?=_
Yes, you can
It depends on how old your tires are and how warn they are. The front tires will wear out first, so if they replace your tires regularly then you can get away with only replacing the front two. If you rotate your tires when you change your oil or don't replace your tires often enough then you will probably want to replace all four at the same time.
No, that would cause the speedometer to be off as there would be 1" difference in diameter. You can replace 215/55-16 with 235/50-16 which would both be 25.3" in diameter. You must keep the diameter as close as possible to the same 25.3" diameter as the OEM tire.
Not unless they are all worn out. You can replace just two tires. I recommend you replace both front or both rear tires at the same time. Also make sure that all 4 tires are the exact same size. If the tires are fairly new and not worn you can replace just one tire if one was damaged as long as the size is the same.
Yes only if you change all 4 tires !
Yes, you can
Yes, you can.
Yes, you can
yes