Hi, I have a set of 4 barely used 215/60/15 tires from my old car and would to use them with my 1990 Audi 80 Quattro. The largest size tire I have been able to confirm will fit my car using 15" wheels is 205/50/15. Does anyone know if the 215/60 's can be used? What are the downsides, if any (e.g., affects speedometer reading slightly)? Thanks for any assistance. Sincerely, Andy