I have wheels on my car that are a different size from the wheel used for the Modern Spare. For example, my wheels may be 19" or 20", and the Modern Spare uses an 18" wheel. Is this OK?

Regardless of your vehicle's wheel size option, we have predetermined the correct tire size for your car.

Rest assured, Modern Spare has carefully designed our spare tire assemblies to have the correct size for your vehicle. 

If you notice that a spare offered for your vehicle model uses an 18" wheel and your car has a 17", 19", 20" of even 21" wheels, the tire used on that spare wheel will be sized specifically for your car. 

The critical measurement is something called "rolling diameter" or in other words, the overall tire height. This measurement is quite different that wheel diameter. 

The graphic below shows how wheel diameter may vary while still maintaining the same overall tire height: