[Dmanj]

4.5 inches is 112.5mm and 110mm is 4.33 inches. It is possible the other ones were 110 if your measurements were only approximate.

But i have heard good things about the x-ice and $300 is a good deal for rims and tires.

 

[Dmanj]

of course they will fit, as long as you get rims that will fit the car, but it will throw off the speedo and increase the wear on your drivetrain because the wheel will revolve more times per second than your current set.

Tire Size Calculator

 

[Dmanj]

Can't fit a 16" rim on a 15" tire

 

[Dmanj]

225/55r17 is going to be your best bet, or you could also do 215/65r16 if you wanted to go 16"

Putting them on is as simple as jacking up one corner of the car, undoing the lug nuts with the wrench in the car and taking the wheel off. Putting the new ones on is just the reverse of that

 

[Dmanj]

Of course you can, but they are made of a softer compound. So with the hot temperatures they wear out a lot faster.