I'm not looking at anything drastic, I am currently running 205/50-16's which are an exact fit for my 95. Later P10's had 195/65-14's as OEM. Early P10's had 195/60-14's as OEM. I am looking to run 205/45-16's which would throw the speedo off by about 3mph when crusing @ 70mph. Not a lot, but I would much rather have it calibrated correctly if the price is not as ridiculous as $500.