At some future date, I plan to replace the stock LS 460L wheels with an aftermarket brand. The question is whether to get 4 or 5? Most combo offers are for 4 only. The car already has a full-sized spare. If I get just four on the ground and a tire blows out in Podunk, IA and trashes a wheel, will I be able to use the OEM spare with three aftermarkets? More specifically, how can you drive with 3 19 or 20" wheels and an 18" spare? With aftermarket styles changing faster than computers and cell phones, What is the possibility that the same model will be readily available as a replacement?
Whoops!. I think I may have answered my own question.

 

More specifically, how can you drive with 3 19 or 20" wheels and an 18" spare?

Since the tire profile on the 19 or 20" wheels will be less than the profile on the 18" wheels, there shouldn't be a difference. You probably want to keep the rear wheels the same and use the spare on the front, which means if you get a flat on the rear you'll have to move one from the front.

 

happened to me....just used the OEM spare to get by till my shop got the new tires...ran just fine...have 22"...used 18" spare....yes lowered too...no damage that i could tell from using OEM spare in my REAR wheel too....