I recently purchased a '92 300SL. It has 18 inch AMG wheels with wide, low profile tires. The spare is 16 inch which I assume is what originally came on the car. If I ever have a flat, is it dangerous or bad for the car to run with different size wheels even for a short distance?

Are there any other concerns with running these larger AMG wheels? Should I consider trading them for a set of 16 inch wheels?

I haven't measured yet to see if there is some speedometer error, but my impression is that it is reading about right.

Scott