Bruce, The best combination for the 16X 7.5 rim is a 215/55/16. This size fills the wheel wells nicely and provides good ride comfort. I've had two sets of wheels on 164's with this combination and it works marvelous. Sandro Marcantonio 1988 Milano Verde 1991 164S 1983 GTV-6 1987 Ducati 750 Paso ------------------------------